太阳极轨射电望远镜(SPORT)是一颗从事太阳活动研究的卫星。重离子探测仪是其中的高能粒子探测仪的关键组成部分。鉴于重离子探测仪对多种类离子(2≤Z≤26)的鉴别和大范围能段(8～300 Me V/u)的测量需求,中国科学院近代物理研究所设计...太阳极轨射电望远镜(SPORT)是一颗从事太阳活动研究的卫星。重离子探测仪是其中的高能粒子探测仪的关键组成部分。鉴于重离子探测仪对多种类离子(2≤Z≤26)的鉴别和大范围能段(8～300 Me V/u)的测量需求,中国科学院近代物理研究所设计并研制了一套Si-Cs I(Tl)望远镜探测系统样机,这套望远镜系统由1个Si探测器、1个入射面为正六边形的CsI(Tl)晶体及其专用电子学系统构成。利用兰州重离子加速器冷却储存环系统(HIRFL-CSR)提供的高品质束流对这套望远镜探测系统样机进行了在束测试,完成了种类为2≤Z≤18的重离子直接测量与鉴别,利用直接测量的重离子,进行外推得到,最高测量要求的300MeV/u Fe离子也在设计要求的范围内。实验结果显示这套望远镜探测器样机满足空间中对大范围能段重离子探测的设计需求,该套方案为SPORT计划中的重离子探测仪的设计及建造奠定了很好的技术基础。展开更多
Charge-changing cross section(σcc)measurements via the transmission method have recently seen significant progress with the aim of determining the charge radii of exotic nuclei.In this work,we report a newσcc measur...Charge-changing cross section(σcc)measurements via the transmission method have recently seen significant progress with the aim of determining the charge radii of exotic nuclei.In this work,we report a newσcc measurement of 304(9)MeV/nucleon^(28)Si on carbon at the second Radioactive Ion Beam Line in Lanzhou(RIBLL2)and describe the data analysis procedure in detail.This procedure is essential for evaluating the systematic uncertainty in the transmission method.The determinedσcc of 1125(11)mb is found to be consistent with the existing data at similar energies.The present work will serve as a reference forσcc determinations at RIBLL2.展开更多
High-spin states of ^165Er were studied using the ^160Gd（^9Be, 4n）reaction at beam energies of 42 and 45 MeV. The previously known bands based on the ν5/2^-[523] and ν5/2^＋[642] configurations have been extended ...High-spin states of ^165Er were studied using the ^160Gd（^9Be, 4n）reaction at beam energies of 42 and 45 MeV. The previously known bands based on the ν5/2^-[523] and ν5/2^＋[642] configurations have been extended to high-spin states. Electric-dipole transitions linking these two opposite parity bands were observed. Relatively large B（E1） values have been extracted experimentally and were attributed to octupole softness.展开更多
基金Upgrade Program for Infrastructure of Large Scale Facilities,CAS(DSS-WXGZ-2018-0002)Youth Innovation Promotion Association of Chinese Academy of Sciences(2018449)Open Research Project of Chinese Academy of Sciences,National Natural Science Foundation of China(U1732137,U1832122,U1738205)。
文摘太阳极轨射电望远镜(SPORT)是一颗从事太阳活动研究的卫星。重离子探测仪是其中的高能粒子探测仪的关键组成部分。鉴于重离子探测仪对多种类离子(2≤Z≤26)的鉴别和大范围能段(8～300 Me V/u)的测量需求,中国科学院近代物理研究所设计并研制了一套Si-Cs I(Tl)望远镜探测系统样机,这套望远镜系统由1个Si探测器、1个入射面为正六边形的CsI(Tl)晶体及其专用电子学系统构成。利用兰州重离子加速器冷却储存环系统(HIRFL-CSR)提供的高品质束流对这套望远镜探测系统样机进行了在束测试,完成了种类为2≤Z≤18的重离子直接测量与鉴别,利用直接测量的重离子,进行外推得到,最高测量要求的300MeV/u Fe离子也在设计要求的范围内。实验结果显示这套望远镜探测器样机满足空间中对大范围能段重离子探测的设计需求,该套方案为SPORT计划中的重离子探测仪的设计及建造奠定了很好的技术基础。
基金Supported by the National Natural Science Foundation of China(U1832211,11961141004,11922501,11475014,11905260)the Western Light Project of Chinese Academy of Sciencesthe Natural Science Foundation of Anhui Province,China(2008085MA17)。
文摘Charge-changing cross section(σcc)measurements via the transmission method have recently seen significant progress with the aim of determining the charge radii of exotic nuclei.In this work,we report a newσcc measurement of 304(9)MeV/nucleon^(28)Si on carbon at the second Radioactive Ion Beam Line in Lanzhou(RIBLL2)and describe the data analysis procedure in detail.This procedure is essential for evaluating the systematic uncertainty in the transmission method.The determinedσcc of 1125(11)mb is found to be consistent with the existing data at similar energies.The present work will serve as a reference forσcc determinations at RIBLL2.
基金Supported in part by National Natural Science Foundation of China (10825522, 10735010, 10805058, 10775158)Chinese Academy of Sciences, Major State Basic Research Development Program of China (2007CB815000)West Light Foundation of The Chinese Academy of Sciences (O803080XBB)
文摘High-spin states of ^165Er were studied using the ^160Gd（^9Be, 4n）reaction at beam energies of 42 and 45 MeV. The previously known bands based on the ν5/2^-[523] and ν5/2^＋[642] configurations have been extended to high-spin states. Electric-dipole transitions linking these two opposite parity bands were observed. Relatively large B（E1） values have been extracted experimentally and were attributed to octupole softness.
