激发态丰质子核的双质子发射  

Two-proton emission from excited states of proton-rich nuclei

作　　者：邢凤竹 崔建坡 王艳召[1,2,3] 顾建中 Xing Feng-Zhu;Cui Jian-Po;Wang Yan-Zhao;Gu Jian-Zhong(Department of Mathematics and Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Institute of Applied Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]石家庄铁道大学数理系,石家庄050043 [2]石家庄铁道大学应用物理研究所,石家庄050043 [3]中国原子能科学研究院,北京102413

出　　处：《物理学报》2022年第6期94-101,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:U1832120,11675265);河北省自然科学基金(批准号:A2020210012,A2021210010);稳定基础支持项目(批准号:WDJC-2019-13);领创科研项目(批准号:LC192209000701)资助的课题.

摘　　要：将有效液滴模型和推广的液滴模型推广至激发态丰质子核的双质子发射半衰期研究,发现这两个模型都能较好地再现双质子发射半衰期的实验数据.基于这两个模型预言了一些核的激发态的双质子发射的半衰期,为将来的实验提供参考,并将上述半衰期与统一裂变模型给出的半衰期进行了比较和分析.此外,以^(94)Ag的21^(+)激发态的双质子发射为例,讨论了衰变能和衰变过程中带走的轨道角动量对其半衰期的影响,发现半衰期对它们的依赖很敏感,半衰期对衰变能的强烈依赖表明了精确测量核质量和激发能的重要性和必要性.The effective liquid drop model(ELDM)and the generalized liquid drop model(GLDM)are extended to the case of studying the two-proton(2p)radioactivity from the excited states of proton-rich nuclei.It is shown that the experimental 2p decay half-lives are reproduced well by the ELDM and the GLDM.Then,the 2p decay half-lives of excited states of some nuclei that are not yet available experimentally are predicted by the two models,which are useful for searching for the new 2p decay candidates in future.Meanwhile,the above predicted half-lives are analyzed and compared with those given by the unified fission model(UFM).Next,the influence of the uncertainties of the decay energy and the angular momentum on the half-lives are analyzed in the frame of the two models by taking the 2p radioactivity of the 21^(+)isomeric state of ^(94)Ag for example.It is found that the half-lives go up with the increase of the angular momentum,following the law of the quadratic function.Furthermore,the strong dependence of the half-lives on the decay energy suggests that it is important and necessary to measure accurately the mass value of the parent nucleus and the daughter nucleus and the excitation energy.Finally,it is necessary to point out that the existence of the 2p radioactivity in the 21^(+)isomeric state of ^(94)Ag remains to be a mystery.Moreover,although the 2p radioactivity is observed from the higher excited states of 17Ne and 18Ne,the relevant hypotheses have not yet been further tested experimentally.The construction of a new generation of radioactive ion beam facilities,such as the high intensity heavy-ion accelerator facility(HIAF),is expected to be used to uncover the nature of the 2p radioactivity in the 21^(+)isomeric state of ^(94)Ag and further test the hypotheses of the 2p decay from the higher excited states of 17Ne and 18Ne.On the other hand,some microscopic models,such as the shell model,need to be further developed by including some necessary physical factors,such as the tensor force,three-body force and accurate

关 键 词：双质子发射 激发态 半衰期 有效液滴模型 推广的液滴模型 

分 类 号：O571[理学—粒子物理与原子核物理]