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    • Attempt to Synthesize the Proton-Unbound 182,183bi Isotopes

    PHYSICAL REVIEW C（2024）

    Chinese Acad Sci | China Inst Atom Energy | Peking Univ | Univ York | Comenius Univ | Univ Chinese Acad Sci | Shandong Univ

    Cited 1|Views19
    Abstract
    The near-symmetric complete fusion reaction 78Kr + 107Ag -> 185Bi & lowast; was studied at the gas-filled recoil separator SHANS with an attempt to synthesize the extremely neutron-deficient proton-unbound 182,183Bi isotopes. No decay events which could be attributed to them were observed. The two- and three-particle evaporation residues 180,179Hg (alpha p, alpha pn) and 183,182Pb (pn, p2n) were identified. Their production cross sections have been measured at two bombarding energies. Based on the yields of 182,183Pb in the present work and the systematics of the ratios between the cross sections of p(x-1)n and xn evaporation channels for the most neutron-deficient odd-Z nuclei above lead, the upper limits for the half-lives of 182,183Bi were estimated to be less than 0.3 mu s.
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    【要点】：本文通过研究78Kr + 107Ag的完全融合反应，尝试合成极度中子缺乏的质子未绑定同位素182Bi和183Bi，并估算了其半衰期上限。
    

    【方法】：利用气体填充反冲分离器SHANS进行实验，通过分析α粒子发射和蒸发残留物来推断目标同位素的存在。
    

    【实验】：在两种轰击能量下，未观察到可归因于182Bi和183Bi的衰变事件。通过测量180Hg和179Hg（αp, αpn）以及183Pb和182Pb（pn, p2n）的生成截面，估计182Bi和183Bi的半衰期上限小于0.3微秒。数据集名称未在文中提及。