The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear matter.Based on the correlation between the differences in charge radii of mirror-partner nuclei and the ...The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear matter.Based on the correlation between the differences in charge radii of mirror-partner nuclei and the slope parameter(L)of symmetry energy at the nuclear saturation density,an analysis of the calibrated slope parameter L was performed in finite nuclei.In this study,relativistic and nonrelativistic energy density functionals were employed to constrain the nuclear symmetry energy through the available databases of the mirror-pair nuclei^(36)Ca–^(36)S,^(38)Ca–^(38)Ar,and ^(54)Ni–^(54)Fe.The deduced nuclear symmetry energy was located in the range 29.89–31.85 MeV,and L of the symmetry energy essentially covered the range 22.50–51.55 MeV at the saturation density.Moreover,the extracted L_(s) at the sensitivity density p_(s)=0.10 fm^(-3) was located in the interval range 30.52–39.76 MeV.展开更多
All of the experimentally known electronic states of the Cr group metal monoxides(Cr O,Mo O,and WO)have been presented in the paper.The optical spectra of the Cr O molecule have been investigated in the gas phase thro...All of the experimentally known electronic states of the Cr group metal monoxides(Cr O,Mo O,and WO)have been presented in the paper.The optical spectra of the Cr O molecule have been investigated in the gas phase through a combination of the laser-induced fluorescence(LIF)excitation and single-vibronic-level(SVL)emission spectroscopy in the supersonic expansion.The rotational constants of the vibronic electronic states,including X^(5)Π_(-1)(v=0–3),B^(5)Π_(-1)(v=0–10),and B~5Π_1(v=1,5),and the vibrational constants of the spin–orbit components X^(5)Π_(-1,0,1)have been obtained.The molecular constants of the Mo O and WO molecules have been summarized by reviewing the previous spectroscopic studies,and a comprehensive energy level diagram of the Cr group metal monoxides has been constructed.By comparing the electronic configurations,bond lengths,and vibrational frequencies of all the transition metal monoxides in the ground electronic state,the significance of the relativistic effect in the bonding of the 5d transition metal monoxides has been discussed.The related spectroscopic data of the Cr O molecule are available at https://doi.org/10.57760/sciencedb.j00113.00085.展开更多
The newly developed software,Nucleus++,is an advanced tool for displaying basic nuclear physics properties from NubAsE and integrating comprehensive mass information for each nuclide from Atomic Mass Evaluation.Additi...The newly developed software,Nucleus++,is an advanced tool for displaying basic nuclear physics properties from NubAsE and integrating comprehensive mass information for each nuclide from Atomic Mass Evaluation.Additionally,it allows users to compare experimental nuclear masses with predictions from different mass models.Building on the success and learning experiences of its predecessor,Nucleus,this enhanced tool introduces improved functionality and compatibility.With its user-friendly interface,Nucleus++was designed as a valuable tool for scholars and practitioners in the field of nuclear science.This article offers an in-depth description of Nucleus++,highlighting its main features and anticipated impacts on nuclear science research.展开更多
In conventional isochronous mass spectrometry(IMS)performed on a storage ring,the precision of mass measurements for short-lived nuclei depends on the accurate determination of the revolution times(T)of stored ions.Ho...In conventional isochronous mass spectrometry(IMS)performed on a storage ring,the precision of mass measurements for short-lived nuclei depends on the accurate determination of the revolution times(T)of stored ions.However,the resolution of T inevitably deteriorates due to the magnetic rigidity spread of the ions,limiting the mass-resolving power.In this study,we used the betatron tunes Q(the number of betatron oscillations per revolution)of the ions and established a correlation between T and Q.From this correlation,T was transformed to correspond to a fixed Q with higher resolution.Using these transformed T values,the masses of ^(63)Ge,^(65)As,^(67)Se,and ^(71)Kr agreed well with the mass values measured using the newly developed IMS(Bρ-IMS).We also studied the systematics of Coulomb displacement energies(CDEs)and found that anomalous staggering in CDEs was eliminated using new mass values.This method of T transformation is highly effective for conventional IMS equipped with a single time-of-flight detector.展开更多
A low-background neutron detector array was developed to measure the cross section of the ^(13)C(a,n)^(16)O reaction,which is the neutron source for the s-process in AGB stars,in the Gamow window(E_(c.m.)=190±40 ...A low-background neutron detector array was developed to measure the cross section of the ^(13)C(a,n)^(16)O reaction,which is the neutron source for the s-process in AGB stars,in the Gamow window(E_(c.m.)=190±40 keV)at the China Jinping Underground Laboratory(CJPL).The detector array consists of 24^(3)He proportional counters embedded in a polyethylene cube.Owing to the deep underground location and a borated polyethylene shield around the detector array,a low background of 4.5(2)/h was achieved.The ^(51)V(p,n)^(51)Cr reaction was used to determine the neutron detection efficiency of the array for neutrons with energies E_(n)<1 MeV.Geant4 simulations are shown to effectively reproduce the experimental results.They were used to extrapolate the detection efficiency to higher energies for neutrons emitted in the ^(13)C(α,n)^(16)O reaction.The theoretical angular distributions of the ^(13)C(α,n)^(16)O reaction were shown to be important in the estimation of the uncertainties of the detection efficiency.展开更多
In the present work,we utilize the approach of the ab initio valence-space in-medium similarity renormalization group(VS-IMSRG)to investigate isospin-symmetry breaking in medium mass nuclei.The adopted nuclear force i...In the present work,we utilize the approach of the ab initio valence-space in-medium similarity renormalization group(VS-IMSRG)to investigate isospin-symmetry breaking in medium mass nuclei.The adopted nuclear force incorporates charge-symmetry and charge-independence breakings.We focus on computing mirror energies of sd-and pf-shell nuclei and discuss the inuence of single-particle states,particularly those with s-wave character,on weakly bound and unbound nuclear states of sd-shell nuclei.展开更多
Studies of three-body forces is one of the frontier research topics in astrophysics as well as in nuclear physics.However,it is too difficult to observe it directly in experiment.In order to study it,we can only measu...Studies of three-body forces is one of the frontier research topics in astrophysics as well as in nuclear physics.However,it is too difficult to observe it directly in experiment.In order to study it,we can only measure some physical observables which are sensitive to three-body forces.According to theory studies[1],we propose to study three-body interaction by measuring ^(40)Ar+^(51)V collisions in the medium energy region at the CSR External Target Facility(ETF)in Lanzhou.展开更多
It is well known that the motion of a charged particle with a nonzero emittance in a storage ring is characterized by betatron oscillations in the transverse plane of the ion motion^([1]).The effects of the betatron o...It is well known that the motion of a charged particle with a nonzero emittance in a storage ring is characterized by betatron oscillations in the transverse plane of the ion motion^([1]).The effects of the betatron oscillation on the revolution time has been observed in the isochronous mass measurement experiments in CSRe^([2]).展开更多
The anti-proton annihilation at darmstadt(PANDA)will be a key experiment at the Facility for antiproton and Ion Research(FAIR).One of its main goals is to measure absolute cross section with precision better than 5%.I...The anti-proton annihilation at darmstadt(PANDA)will be a key experiment at the Facility for antiproton and Ion Research(FAIR).One of its main goals is to measure absolute cross section with precision better than 5%.In order to calibrate the PANDA luminosity,the key experiment for Panda luminosity calibartion(KOALA),which is to measure the anti-proton proton elastic scattering,will be carried out at the very beginning of the full run of PANDA.The total cross section(σtot),the ratio of the real to imaginary part of the scattering amplitude(ρ)。展开更多
We obtain the leading-twist valence quark transverse-momentum-dependent parton distribution functions(TMD PDFs)of quarks in the proton within the basis light-front quantization(BLFQ)framework.Our results are consisten...We obtain the leading-twist valence quark transverse-momentum-dependent parton distribution functions(TMD PDFs)of quarks in the proton within the basis light-front quantization(BLFQ)framework.Our results are consistent with lattice QCD calculations and the previous BLFQ calculations of the collinear dirtibutions.We also obtain consistency with the So er-type bounds.Within our approach,we nd that six T-even TMDs in the leading twist are all independent of each other,and previously found model-dependent relations do not hold.This is a promising sign that our results are representative of future,more extensive treatments of QCD(Fig.1).展开更多
The reactions of single gold ion Au^(+)with CO and H_(2)O molecules in gas phase were studied by experiment and calculation.A reaction tube was designed under the steam of the laser sputtering position to destroy the ...The reactions of single gold ion Au^(+)with CO and H_(2)O molecules in gas phase were studied by experiment and calculation.A reaction tube was designed under the steam of the laser sputtering position to destroy the supersonic molecular jet and enhance the collisions between the sputtered metal ions with gas molecules,ensuring the equilibrium reaction conditions.The ionic products were analyzed by a time-of-flight mass spectrometer.展开更多
In recent decades,much experimental progress has been made in the synthesis of SHEs and several attempts have been made.However,none of these experiments provide evidence for the successful synthesis of the new elemen...In recent decades,much experimental progress has been made in the synthesis of SHEs and several attempts have been made.However,none of these experiments provide evidence for the successful synthesis of the new elements.In order to produce the new elements with proton number Z=119 or 120,IMP-CAS(Institute of Modern Physics,Chinese Academy of Sciences)constructed the China Accelerator Facility for superheavy Elements(CAFE2).The beams with medium mass,such as ^(50)Ti,^(51)V,^(54)Cr,^(55)Mn.展开更多
Proton-andα-decay spectroscopy can provide valuable information on the nuclear structure and masses of neutron-de cient isotopes.In 1994,the proton drip line of Ac was reached by the detection of^(207)Ac which was id...Proton-andα-decay spectroscopy can provide valuable information on the nuclear structure and masses of neutron-de cient isotopes.In 1994,the proton drip line of Ac was reached by the detection of^(207)Ac which was identified via the-decay spectroscopy.Four years later,the neighboring proton-unbound nucleus ^(206)Ac was discov-ered.展开更多
We provide an investigation of the spectroscopic factor of resonance states in A=5-8 nuclei,utilizing the Gamow shell model(GSM).Within the GSM,the configuration mixing is taken into account exactly with the shell mod...We provide an investigation of the spectroscopic factor of resonance states in A=5-8 nuclei,utilizing the Gamow shell model(GSM).Within the GSM,the configuration mixing is taken into account exactly with the shell model framework,and the continuum coupling is addressed via the complex-energy Berggren ensemble,which treats bound,resonance,and non-resonant continuum single-particle states on an equal footing.As a result,both the configuration mixing and continuum coupling are meticulously considered in the GSM.We first calculate the low-lying states of helium isotopes and isotones with the GSM,and the results are compared with that of ab initio no-core shell model(NCSM)calculations.The results indicate that GSM can reproduce the low-lying resonance states more accurately than the NCSM.Following this,we delve into the spectroscopic factors of the resonance states as computed through both GSM and NCSM,concurrently conducting systematic calculations of overlap functions pertinent to these resonance states.Finally,the calculated overlap function and spectroscopic factor of6He(01+)■νp3/2→^(7)He(3/2_(1)-)with GSM are compared with the results from ab initio NCSM,variational Monte Carlo,and Green’s function Monte Carlo calculations,as well as available experimental data.The results assert that wave function asymptotes can only be reproduced in GSM,where resonance and continuum coupling are precisely addressed.展开更多
The elastic scattering angular distributions of ^(13)C at 340 MeV and ^(14)C at 294 MeV and 342 MeV on a ^(208)Pb target,which correspond to approximately five times the Coulomb barriers,were measured at the Radioacti...The elastic scattering angular distributions of ^(13)C at 340 MeV and ^(14)C at 294 MeV and 342 MeV on a ^(208)Pb target,which correspond to approximately five times the Coulomb barriers,were measured at the Radioactive Ion Beam Line in Lanzhou.The data were analyzed within the optical model and continuum-discretized coupled-channels(CDCC)framework,and the results of both calculations could effectively account for the experimental data.The differential cross sections of elastic scattering revealed no particular suppression at the Coulomb nuclear interference peak angles,suggesting that the breakup coupling effects on the elastic scattering angular distributions were negligibly small in this incident energy region.The contributions from the couplings with inelastic states to the elastic cross sections were of minor importance within the angular range covered by these experiments.展开更多
The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ri...The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou.The new mass excess value allowed us to determine the excitation energies of the two low-lying 1+states in ^(22)Al with significantly reduced uncertainties of 51 keV.When compared to the analogue states in its mirror nucleus ^(22)F,the mirror energy differences of the two 1^(+)states in the ^(22)Al-^(22)F mirror pair are determined to be−625(51)keV and−330(51)keV.The excitation energies and mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory.The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of theπs_(1/2) orbital.展开更多
The coexistence of neutron-neutron(n-n),proton-proton(p-p),and neutron-proton(n-p)pairings is investigated by adopting an effective density-dependent contact pairing potential.These three types of pairings can coexist...The coexistence of neutron-neutron(n-n),proton-proton(p-p),and neutron-proton(n-p)pairings is investigated by adopting an effective density-dependent contact pairing potential.These three types of pairings can coexist only if the n-p pairing is stronger than the n-n and p-p pairings for the isospin asymmetric nuclear matter.In addition,the existence of n-n and p-p pairs might enhance n-p pairings in asymmetric nuclear matter when the n-p pairing strength is significantly stronger than the n-n and p-p ones.Conversely,the n-p pairing is reduced by the n-n and p-p pairs when the n-p pairing interaction approaches n-n and p-p pairings.展开更多
The complete fusion reaction of^(55)Mn+^(159)Tb was studied on the gafilled recoil separator SHANS2.Nineteen ER-α1-α2 decay chains from^(210)Th produced from the 4n evaporation channel were observed.The a-particle e...The complete fusion reaction of^(55)Mn+^(159)Tb was studied on the gafilled recoil separator SHANS2.Nineteen ER-α1-α2 decay chains from^(210)Th produced from the 4n evaporation channel were observed.The a-particle energy and half-life of 210Th were determined as 7922(14)keV and 14(4)ms,respectively.In addition,the decay properties of Eα=7788(14)keV and T_(1/2)=36+15-8 ms were obtained for 21Th.The measured a decay prop-erties of^(210)Th and^(211)Th were consistent with literature data.The cross sections were measured to be 0.59+035 nb and 0.19-012 nb for^(210)Th and^(211)Th,respectively.The equilibrium charge state of the recoiled nucleus^(210)Th was determined experimentally.The new data were helpful for estimating the equilibrium charge states of elements 119 and 120,which could be produced via the^(240)Pu(^(55)Mn,3n)^(292)119 and^(243)Am(^(55)Mn,3m)^(295)120 reactions,respect-ively.展开更多
Pronounced changes of nuclear charge radii provide a stringent benchmark on the theoretical models and play a vital role in recognizing various nuclear phenomena.In this work,the systematic evolutions of nuclear charg...Pronounced changes of nuclear charge radii provide a stringent benchmark on the theoretical models and play a vital role in recognizing various nuclear phenomena.In this work,the systematic evolutions of nuclear charge radii along even Z=84-120 isotopic chains are first investigated by the recently developed new ansatz under the covariant density functional.The calculated results show that the shell closure effects of nuclear charge radii appear remarkably at the neutron numbers N=126 and 184.Interestingly,the arch-like shapes of charge radii between these two strong neutron-closed shells are naturally observed.Across the N=184 shell closure,the abrupt increase in charge radii is still evidently emerged.In addition,the rapid raise of nuclear charge radii from the neutron numbers N=138 to N=144 is disclosed clearly in superheavy regions due to the enhanced shape deformation.展开更多
We calculate the centrality dependence of inclusive cross section of large-p _(T )charmed-meson(D^0,D~*,D^(*+),and D_s^+)from heavy quark fragmentation by the hard photoproduction processes in ultrarelativistic heavy ...We calculate the centrality dependence of inclusive cross section of large-p _(T )charmed-meson(D^0,D~*,D^(*+),and D_s^+)from heavy quark fragmentation by the hard photoproduction processes in ultrarelativistic heavy ion collisions.The numerical results indicate that the contribution of the hard photoproduction processes cannot be negligible for the inclusive charmed-meson production in Au-Au collisions at Relativistic Heavy Ion Collider(RHIC)and Pb-Pb collisions at Large Hadron Collider(LHC).展开更多
基金supported by the Key Laboratory of High Precision Nuclear Spectroscopy,Institute of Modern Physics,Chinese Academy of Sciences,the National Natural Science Foundation of China(Nos.12135004,11635003,11961141004,12275025,and 11975096)the Fundamental Research Funds for Central Universities(No.2020NTST06).
文摘The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear matter.Based on the correlation between the differences in charge radii of mirror-partner nuclei and the slope parameter(L)of symmetry energy at the nuclear saturation density,an analysis of the calibrated slope parameter L was performed in finite nuclei.In this study,relativistic and nonrelativistic energy density functionals were employed to constrain the nuclear symmetry energy through the available databases of the mirror-pair nuclei^(36)Ca–^(36)S,^(38)Ca–^(38)Ar,and ^(54)Ni–^(54)Fe.The deduced nuclear symmetry energy was located in the range 29.89–31.85 MeV,and L of the symmetry energy essentially covered the range 22.50–51.55 MeV at the saturation density.Moreover,the extracted L_(s) at the sensitivity density p_(s)=0.10 fm^(-3) was located in the interval range 30.52–39.76 MeV.
基金the National Key R&D Program of China(Grant No.2022YFA1602500)the National Natural Science Foundation of China(Grant No.12027809)Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB21030900)。
文摘All of the experimentally known electronic states of the Cr group metal monoxides(Cr O,Mo O,and WO)have been presented in the paper.The optical spectra of the Cr O molecule have been investigated in the gas phase through a combination of the laser-induced fluorescence(LIF)excitation and single-vibronic-level(SVL)emission spectroscopy in the supersonic expansion.The rotational constants of the vibronic electronic states,including X^(5)Π_(-1)(v=0–3),B^(5)Π_(-1)(v=0–10),and B~5Π_1(v=1,5),and the vibrational constants of the spin–orbit components X^(5)Π_(-1,0,1)have been obtained.The molecular constants of the Mo O and WO molecules have been summarized by reviewing the previous spectroscopic studies,and a comprehensive energy level diagram of the Cr group metal monoxides has been constructed.By comparing the electronic configurations,bond lengths,and vibrational frequencies of all the transition metal monoxides in the ground electronic state,the significance of the relativistic effect in the bonding of the 5d transition metal monoxides has been discussed.The related spectroscopic data of the Cr O molecule are available at https://doi.org/10.57760/sciencedb.j00113.00085.
基金supported in part by the National Key R&D Program of China(No.2021YFA1601500)CAS Project for Young Scientists in Basic Research(No.YSBR-002)+5 种基金Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB34000000)the Regional Development Youth Program of the Chinese Academy of Sciences(People’s Character[2023]No.15)Argonne National Laboratory was performed with the support of the US Department of EnergyOffice of Nuclear Physicsunder Contract No.DE-AC02-06CH11357support of France's IN2P3。
文摘The newly developed software,Nucleus++,is an advanced tool for displaying basic nuclear physics properties from NubAsE and integrating comprehensive mass information for each nuclide from Atomic Mass Evaluation.Additionally,it allows users to compare experimental nuclear masses with predictions from different mass models.Building on the success and learning experiences of its predecessor,Nucleus,this enhanced tool introduces improved functionality and compatibility.With its user-friendly interface,Nucleus++was designed as a valuable tool for scholars and practitioners in the field of nuclear science.This article offers an in-depth description of Nucleus++,highlighting its main features and anticipated impacts on nuclear science research.
基金supported in part by the National Key R&D Program of China(No.2023YFA1606401)CAS Project for Young Scientists in Basic Research(No.YSBR-002)+3 种基金Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB34000000)and the NSFC(Nos.12305126,12135017,12121005)Y.M.X.acknowledges the support from the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2021419)X.L.Y.acknowledges the support from the Yong Scholar of Regional Development,CAS(No.[2023]15).
文摘In conventional isochronous mass spectrometry(IMS)performed on a storage ring,the precision of mass measurements for short-lived nuclei depends on the accurate determination of the revolution times(T)of stored ions.However,the resolution of T inevitably deteriorates due to the magnetic rigidity spread of the ions,limiting the mass-resolving power.In this study,we used the betatron tunes Q(the number of betatron oscillations per revolution)of the ions and established a correlation between T and Q.From this correlation,T was transformed to correspond to a fixed Q with higher resolution.Using these transformed T values,the masses of ^(63)Ge,^(65)As,^(67)Se,and ^(71)Kr agreed well with the mass values measured using the newly developed IMS(Bρ-IMS).We also studied the systematics of Coulomb displacement energies(CDEs)and found that anomalous staggering in CDEs was eliminated using new mass values.This method of T transformation is highly effective for conventional IMS equipped with a single time-of-flight detector.
基金supported by the National Natural Science Foundation of China(Nos.11490564 and 11805138).
文摘A low-background neutron detector array was developed to measure the cross section of the ^(13)C(a,n)^(16)O reaction,which is the neutron source for the s-process in AGB stars,in the Gamow window(E_(c.m.)=190±40 keV)at the China Jinping Underground Laboratory(CJPL).The detector array consists of 24^(3)He proportional counters embedded in a polyethylene cube.Owing to the deep underground location and a borated polyethylene shield around the detector array,a low background of 4.5(2)/h was achieved.The ^(51)V(p,n)^(51)Cr reaction was used to determine the neutron detection efficiency of the array for neutrons with energies E_(n)<1 MeV.Geant4 simulations are shown to effectively reproduce the experimental results.They were used to extrapolate the detection efficiency to higher energies for neutrons emitted in the ^(13)C(α,n)^(16)O reaction.The theoretical angular distributions of the ^(13)C(α,n)^(16)O reaction were shown to be important in the estimation of the uncertainties of the detection efficiency.
基金National Natural Science Foundation of China(12205340,12175281,11975282,11921006,11835001,12035001)Gansu Natural Science Foundation(22JR5RA123)Strategic Priority Research Program of Chinese Academy of Sciences(XDB34000000)。
文摘In the present work,we utilize the approach of the ab initio valence-space in-medium similarity renormalization group(VS-IMSRG)to investigate isospin-symmetry breaking in medium mass nuclei.The adopted nuclear force incorporates charge-symmetry and charge-independence breakings.We focus on computing mirror energies of sd-and pf-shell nuclei and discuss the inuence of single-particle states,particularly those with s-wave character,on weakly bound and unbound nuclear states of sd-shell nuclei.
文摘Studies of three-body forces is one of the frontier research topics in astrophysics as well as in nuclear physics.However,it is too difficult to observe it directly in experiment.In order to study it,we can only measure some physical observables which are sensitive to three-body forces.According to theory studies[1],we propose to study three-body interaction by measuring ^(40)Ar+^(51)V collisions in the medium energy region at the CSR External Target Facility(ETF)in Lanzhou.
基金CAS Project for Young Scientists in Basic Research(YSBR-002)National Key R&D Program of China(2018YFA0404401)+1 种基金Strategic Priority Research Program of Chinese Academy of Sciences(XDB34000000)National Natural Science Foundation of China(12135017,12121005)。
文摘It is well known that the motion of a charged particle with a nonzero emittance in a storage ring is characterized by betatron oscillations in the transverse plane of the ion motion^([1]).The effects of the betatron oscillation on the revolution time has been observed in the isochronous mass measurement experiments in CSRe^([2]).
基金National Basic Research Program of China(973 Program)(2014CB845405)China Postdoctoral Science Foundation Funded Project(2017M610663)。
文摘The anti-proton annihilation at darmstadt(PANDA)will be a key experiment at the Facility for antiproton and Ion Research(FAIR).One of its main goals is to measure absolute cross section with precision better than 5%.In order to calibrate the PANDA luminosity,the key experiment for Panda luminosity calibartion(KOALA),which is to measure the anti-proton proton elastic scattering,will be carried out at the very beginning of the full run of PANDA.The total cross section(σtot),the ratio of the real to imaginary part of the scattering amplitude(ρ)。
基金National Natural Science Foundation of China(11850410436,1950410753)Key Research Program of Frontier Sciences,Chinese Academy of Sciences(ZDB-SLY-7020)Strategic Priority Research Program of Chinese Academy of Sciences(XDB34000000)。
文摘We obtain the leading-twist valence quark transverse-momentum-dependent parton distribution functions(TMD PDFs)of quarks in the proton within the basis light-front quantization(BLFQ)framework.Our results are consistent with lattice QCD calculations and the previous BLFQ calculations of the collinear dirtibutions.We also obtain consistency with the So er-type bounds.Within our approach,we nd that six T-even TMDs in the leading twist are all independent of each other,and previously found model-dependent relations do not hold.This is a promising sign that our results are representative of future,more extensive treatments of QCD(Fig.1).
基金National Natural Science Foundation of China(U1832175)Strategic Priority Research Program of Chinese Academy of Sciences(XDB21030900)。
文摘The reactions of single gold ion Au^(+)with CO and H_(2)O molecules in gas phase were studied by experiment and calculation.A reaction tube was designed under the steam of the laser sputtering position to destroy the supersonic molecular jet and enhance the collisions between the sputtered metal ions with gas molecules,ensuring the equilibrium reaction conditions.The ionic products were analyzed by a time-of-flight mass spectrometer.
基金Strategic Priority Research Program of Chinese Academy of Sciences(XDB34010000)Guangdong Major Project of Basic and Applied Basic Research(2021B0301030006)+4 种基金National Key R&D Program of China(2018YFA0404402)CAS Project for Young Scientists in Basic Research(YSBR-002)Youth Innovation Promotion Association CAS(2020409)National Natural Science Foundation of China(11975279,11965003,12105328)Special Research Assistant Project of Chinese Academy of Sciences and Central Government Guidance Funds for Local Scientific and Technological Development(Guike ZY22096024)。
文摘In recent decades,much experimental progress has been made in the synthesis of SHEs and several attempts have been made.However,none of these experiments provide evidence for the successful synthesis of the new elements.In order to produce the new elements with proton number Z=119 or 120,IMP-CAS(Institute of Modern Physics,Chinese Academy of Sciences)constructed the China Accelerator Facility for superheavy Elements(CAFE2).The beams with medium mass,such as ^(50)Ti,^(51)V,^(54)Cr,^(55)Mn.
基金Strategic Priority Research Program of Chinese Academy of Sciences(XDB34010000)Guangdong Major Project of Basic and Applied Basic Research(2021B0301030006)+4 种基金National Key R&D Program of China(2018YFA0404402)National Natural Science Foundation of China(U1932139,12105328,12035011,U2032135,11975279)Youth Innovation Promotion Association CAS(2020409)CAS Project for Young Scientists in Basic Research(YSBR-002)Special Research Assistant Project of Chinese Academy of Sciences。
文摘Proton-andα-decay spectroscopy can provide valuable information on the nuclear structure and masses of neutron-de cient isotopes.In 1994,the proton drip line of Ac was reached by the detection of^(207)Ac which was identified via the-decay spectroscopy.Four years later,the neighboring proton-unbound nucleus ^(206)Ac was discov-ered.
基金supported by the National Natural Science Foundation of China(Grant Nos.12205340,12175281,and 11975282)the Gansu Natural Science Foundation(Grant No.22JR5RA123)+3 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB34000000)the Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB15)the State Key Laboratory of Nuclear Physics and TechnologyPeking University(Grant No.NPT2020KFY13)。
文摘We provide an investigation of the spectroscopic factor of resonance states in A=5-8 nuclei,utilizing the Gamow shell model(GSM).Within the GSM,the configuration mixing is taken into account exactly with the shell model framework,and the continuum coupling is addressed via the complex-energy Berggren ensemble,which treats bound,resonance,and non-resonant continuum single-particle states on an equal footing.As a result,both the configuration mixing and continuum coupling are meticulously considered in the GSM.We first calculate the low-lying states of helium isotopes and isotones with the GSM,and the results are compared with that of ab initio no-core shell model(NCSM)calculations.The results indicate that GSM can reproduce the low-lying resonance states more accurately than the NCSM.Following this,we delve into the spectroscopic factors of the resonance states as computed through both GSM and NCSM,concurrently conducting systematic calculations of overlap functions pertinent to these resonance states.Finally,the calculated overlap function and spectroscopic factor of6He(01+)■νp3/2→^(7)He(3/2_(1)-)with GSM are compared with the results from ab initio NCSM,variational Monte Carlo,and Green’s function Monte Carlo calculations,as well as available experimental data.The results assert that wave function asymptotes can only be reproduced in GSM,where resonance and continuum coupling are precisely addressed.
基金Supported by the National Natural Science Foundation of China (12122511,12105330)the Youth Innovation Promotion Association CAS (2020411)+1 种基金funding from the State Key Laboratory of Nuclear Physics and Technology,Peking University (NPT2023KFY04)V.G.would like to thank CNPq (303769/2021-1).
文摘The elastic scattering angular distributions of ^(13)C at 340 MeV and ^(14)C at 294 MeV and 342 MeV on a ^(208)Pb target,which correspond to approximately five times the Coulomb barriers,were measured at the Radioactive Ion Beam Line in Lanzhou.The data were analyzed within the optical model and continuum-discretized coupled-channels(CDCC)framework,and the results of both calculations could effectively account for the experimental data.The differential cross sections of elastic scattering revealed no particular suppression at the Coulomb nuclear interference peak angles,suggesting that the breakup coupling effects on the elastic scattering angular distributions were negligibly small in this incident energy region.The contributions from the couplings with inelastic states to the elastic cross sections were of minor importance within the angular range covered by these experiments.
基金Supported in part by the Strategic Priority Research Program of Chinese Academy of Sciences (XDB34000000)the CAS Project for Young Scientists in Basic Research (YSBR-002)+4 种基金the National Nature Science Foundation of China (12135017,12121005,11975280,12105333,12205340,12322507,12305126,12305151)the Gansu Natural Science Foundation (22JR5RA123,23JRRA614)the National Key R&D Program of China (2021YFA1601500)Support from the Youth Innovation Promotion Association of Chinese Academy of Sciences (2021419,2022423)support from Young Scholar of Regional Development,CAS ([2023]15).
文摘The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou.The new mass excess value allowed us to determine the excitation energies of the two low-lying 1+states in ^(22)Al with significantly reduced uncertainties of 51 keV.When compared to the analogue states in its mirror nucleus ^(22)F,the mirror energy differences of the two 1^(+)states in the ^(22)Al-^(22)F mirror pair are determined to be−625(51)keV and−330(51)keV.The excitation energies and mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory.The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of theπs_(1/2) orbital.
基金Supported by National Natural Science Foundation of China(11975282,11775276,11435014,11505241)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34000000)the Youth Innovation Promotion Association of Chinese Academy of Sciences(Y2021414,Y201871)。
文摘The coexistence of neutron-neutron(n-n),proton-proton(p-p),and neutron-proton(n-p)pairings is investigated by adopting an effective density-dependent contact pairing potential.These three types of pairings can coexist only if the n-p pairing is stronger than the n-n and p-p pairings for the isospin asymmetric nuclear matter.In addition,the existence of n-n and p-p pairs might enhance n-p pairings in asymmetric nuclear matter when the n-p pairing strength is significantly stronger than the n-n and p-p ones.Conversely,the n-p pairing is reduced by the n-n and p-p pairs when the n-p pairing interaction approaches n-n and p-p pairings.
基金Supported by the Strategic Priority Research Program of Chinese Academy of Sciences (XDB34010000)the Guangdong Major Project of Basic and Applied Basic Research (2021B0301030006)+5 种基金the National Key R&D Program of China (2018YFA0404402)the CAS Project for Young Scientists in Basic Research (YSBR-002)the Youth Innovation Promotion Association CAS (2020409)the National Natural Science Foundation of China (11975279,11965003,12105328)the Special Research Assistant Project of the Chinese Academy of Sciencesthe Central Government Guidance Funds for Local Scientific and Technological Development,China (Guike ZY22096024)
文摘The complete fusion reaction of^(55)Mn+^(159)Tb was studied on the gafilled recoil separator SHANS2.Nineteen ER-α1-α2 decay chains from^(210)Th produced from the 4n evaporation channel were observed.The a-particle energy and half-life of 210Th were determined as 7922(14)keV and 14(4)ms,respectively.In addition,the decay properties of Eα=7788(14)keV and T_(1/2)=36+15-8 ms were obtained for 21Th.The measured a decay prop-erties of^(210)Th and^(211)Th were consistent with literature data.The cross sections were measured to be 0.59+035 nb and 0.19-012 nb for^(210)Th and^(211)Th,respectively.The equilibrium charge state of the recoiled nucleus^(210)Th was determined experimentally.The new data were helpful for estimating the equilibrium charge states of elements 119 and 120,which could be produced via the^(240)Pu(^(55)Mn,3n)^(292)119 and^(243)Am(^(55)Mn,3m)^(295)120 reactions,respect-ively.
基金funded by the Key Laboratory of High Precision Nuclear Spectroscopy,Institute of Modern Physics,Chinese Academy of Sciencessupported partly by the National Natural Science Foundation of China under Grants No.12135004,No.11635003,No.11961141004 and No.12047513+1 种基金the support of the National Natural Science Foundation of China under Grants No.11975096the Fundamental Research Funds for the Central Universities(2020NTST06)。
文摘Pronounced changes of nuclear charge radii provide a stringent benchmark on the theoretical models and play a vital role in recognizing various nuclear phenomena.In this work,the systematic evolutions of nuclear charge radii along even Z=84-120 isotopic chains are first investigated by the recently developed new ansatz under the covariant density functional.The calculated results show that the shell closure effects of nuclear charge radii appear remarkably at the neutron numbers N=126 and 184.Interestingly,the arch-like shapes of charge radii between these two strong neutron-closed shells are naturally observed.Across the N=184 shell closure,the abrupt increase in charge radii is still evidently emerged.In addition,the rapid raise of nuclear charge radii from the neutron numbers N=138 to N=144 is disclosed clearly in superheavy regions due to the enhanced shape deformation.
基金Supported by the National Natural Science Foundation of China under Grant No.11847207the International Postdoctoral Exchange Fellowship Program of China under Grant No.20180010the China Postdoctoral Science Foundation funded project No.2017M610663
文摘We calculate the centrality dependence of inclusive cross section of large-p _(T )charmed-meson(D^0,D~*,D^(*+),and D_s^+)from heavy quark fragmentation by the hard photoproduction processes in ultrarelativistic heavy ion collisions.The numerical results indicate that the contribution of the hard photoproduction processes cannot be negligible for the inclusive charmed-meson production in Au-Au collisions at Relativistic Heavy Ion Collider(RHIC)and Pb-Pb collisions at Large Hadron Collider(LHC).
