One-neutron stripping process between^(6)Li and^(209)Bi was studied at 28,30,and 34 MeV using the in-beamγ-ray spectroscopy method.Theγ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long...One-neutron stripping process between^(6)Li and^(209)Bi was studied at 28,30,and 34 MeV using the in-beamγ-ray spectroscopy method.Theγ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long-lived isomeric states,which were employed to determine the cross section.The one-neutron stripping cross sections were similar to the cross sections of complete fusion in the^(6)Li+^(209)Bi system,but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region.A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in^(6)Li.The calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism,and the valence proton of 209Bi can be excited to the low-lying excited state in(^(6)Li,^(5)Li)reaction,unlike in the(d,p)reaction.展开更多
为在γ放射性活度很大的测量中使测量系统得到更好的准确度，本文使用干扰源研究 HPGe探测器得到了测量系统死时间与计数损失的关系。在γ能量为0.3～1.3 M eV 时进行实验，使用10^4～10^5 Bq量级的放射源，修正能峰的计数率一般保持在...为在γ放射性活度很大的测量中使测量系统得到更好的准确度，本文使用干扰源研究 HPGe探测器得到了测量系统死时间与计数损失的关系。在γ能量为0.3～1.3 M eV 时进行实验，使用10^4～10^5 Bq量级的放射源，修正能峰的计数率一般保持在几十s－1，证明在误差范围（3％）内，计数损失随死时间变化的关系与射线能量和计数强度无关，任意强度的任意核素均可使用这一修正公式进行计数损失修正。展开更多
基金the National Nature Science Foundation of China(Nos.U2167204,11975040,and U1832130)the Brazilian funding agencies CAPES,CNPq,FAPERJ,and the INCT-FNA(Instituto Nacional de Ciência e Tecnologia-Física Nuclear e Aplicações)+5 种基金research project 464898/2014-5.S.P.Hu was supported by Guang dong Key Research And Development Program(No.2020B040420005)Guang dong Basic and Applied Basic Research Foundation(No.2021B1515120027)Ling Chuang Research Project of China National Nuclear Corporation(No.20221024000072F6-0002-7)Nuclear Energy Development and Research Project(No.HNKF202224(28))the‘111’center(B20065)the U.S.Department of Energy,Office of Science,Office of Nuclear Physics,under contract number DE-AC02-06CH1135.
文摘One-neutron stripping process between^(6)Li and^(209)Bi was studied at 28,30,and 34 MeV using the in-beamγ-ray spectroscopy method.Theγ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long-lived isomeric states,which were employed to determine the cross section.The one-neutron stripping cross sections were similar to the cross sections of complete fusion in the^(6)Li+^(209)Bi system,but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region.A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in^(6)Li.The calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism,and the valence proton of 209Bi can be excited to the low-lying excited state in(^(6)Li,^(5)Li)reaction,unlike in the(d,p)reaction.
文摘为在γ放射性活度很大的测量中使测量系统得到更好的准确度，本文使用干扰源研究 HPGe探测器得到了测量系统死时间与计数损失的关系。在γ能量为0.3～1.3 M eV 时进行实验，使用10^4～10^5 Bq量级的放射源，修正能峰的计数率一般保持在几十s－1，证明在误差范围（3％）内，计数损失随死时间变化的关系与射线能量和计数强度无关，任意强度的任意核素均可使用这一修正公式进行计数损失修正。
