Theoretical study on production of heavy neutron-rich isotopes around the N = 126 shell closure in radioactive beam induced transfer reactions
Theoretical study on production of heavy neutron-rich isotopes around the N = 126 shell closure in radioactive beam induced transfer reactions
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DOI：
10.1016/j.physletb.2017.01.082
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发表时间：
2017-04
影响因子：
4.4
通讯作者：
Long Zhu;Jun Su;Wen-Jie Xie;Feng-Shou Zhang
中科院分区：
文献类型：
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作者：
Long Zhu;Jun Su;Wen-Jie Xie;Feng-Shou Zhang
为了在N= 126附近产生更多未知丰中子核，在双核系统（DNS）模型框架下研究了136 ~ Sn + 198 Pt，136-144 ~ Sn + 208 Pb和132 ~ Sn+ 208 Pb的转移反应.通过136，144 Xe+ 208 Pb反应研究了弹丸中子过剩对类靶产物产生截面的影响。我们发现，具有更大中子过剩的放射性射弹144有利于产生电荷数小于靶的丰中子核，而不是产生跨靶核。研究了132 Sn+ 208 Pb反应中碎片产额分布与入射能量的关系。在136-144 Sn +~（208）Pb和132 Sn+~（208）Pb反应中，给出了Z= 72-77的丰中子核的产生截面.结果表明，144 Pb + 208 Pb反应中未知丰中子核的产生截面比136 Pb + 208 Pb反应中未知丰中子核的产生截面至少大两个数量级。本文首次研究了139，144 <$+ 208 Pb放射性束流诱导转移反应，考虑到SPIRAL 2（放射性离子和加速在线生产系统）计划提出的束流强度，在N= 126壳层附近产生丰中子核。结果表明，与稳定束136 <$N相比，放射性束144 <$N在产生N= 126的丰中子核方面有很大的优势，而在产生电荷数较少的核方面优势更为明显。
In order to produce more unknown neutron-rich nuclei around N= 126, the transfer reactions 136 Xe+ 198 Pt, 136–144 Xe+ 208 Pb, and 132 Sn+ 208 Pb are investigated within the framework of the dinuclear system (DNS) model. The influence of neutron excess of projectile on production cross sections of target-like products is studied through the reactions 136,144 Xe+ 208 Pb. We find that the radioactive projectile 144 Xe with much larger neutron excess is favorable to produce neutron-rich nuclei with charge number less than the target rather than produce transtarget nuclei. The incident energy dependence of yield distributions of fragments in the reaction 132 Sn+ 208 Pb are also studied. The production cross sections of neutron-rich nuclei with Z= 72–77 are predicted in the reactions 136–144 Xe+ 208 Pb and 132 Sn+ 208 Pb. It is noticed that the production cross sections of unknown neutron-rich nuclei in the reaction 144 Xe+ 208 Pb are at least two orders of magnitude larger than those in the reaction 136 Xe+ 208 Pb. The radioactive beam induced transfer reactions 139,144 Xe+ 208 Pb, considering beam intensities proposed in SPIRAL2 (Production System of Radioactive Ion and Acceleration On-Line) project as well, for production of neutron-rich nuclei around the N= 126 shell closure are investigated for the first time. It is found that, in comparison to the stable beam 136 Xe, the radioactive beam 144 Xe shows great advantages for producing neutron-rich nuclei with N= 126 and the advantages get more obvious for producing nuclei with less charge number.