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arXiv 0810.3597nucl-ex
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Rp过程核PDMATHAAB Cd、PDMATHAAC In和$^{100}$ Sn的产生和PDMATHAAA衰变

Production and $β$ decay of rp-process nuclei $^{96}$Cd, $^{98}$In and $^{100}$Sn

D. Bazin

摘要:

本文研究了N = Z核$^{96}$ Cd,$^{98}$ In和$^{100}$ Sn的$β$衰变性质.这些核是在国家超导回旋加速器实验室(NSCL)通过在Be靶上分裂120 MeV/核子$^{112}$ Sn初级束而产生的。产生的放射性束在A1900和新投入使用的射频碎片分离器(RFFS)中过滤,以达到适合衰变研究的纯度水平。观察到的这些核的生产截面比预测的低10至30倍。$^{100}$ Sn的产生截面为0.25(15)pb,与在63 MeV/核子入射能量下建立的120 pb下限形成鲜明对比。推导出的$^{100}$ Sn的半衰期为0.55 $^{+0.70}_{-0.31}$ s,与之前的测量结果一致。在$^{98}$ In中观察到两种$β$-衰变状态,测量的半衰期为47(13)ms和0.66(40)s。$^{96}$ Cd的半衰期是1.03 $^{+0.24}_{-0.21}$ s,它是天体物理学rp过程的最后一个实验未知等待点半衰期。探讨了$^{96}$ Cd的实验T $_{1/2}$值对由rp过程计算预测的丰度和A = 96等压线如$^{96}$ Ru的起源的影响。

英文摘要:

The $β$-decay properties of the N=Z nuclei $^{96}$Cd, $^{98}$In and $^{100}$Sn have been studied. These nuclei were produced at the National Superconducting Cyclotron Laboratory (NSCL) by fragmenting a 120 MeV/nucleon $^{112}$Sn primary beam on a Be target. The resulting radioactive beam was filtered in the A1900 and the newly commissioned Radio Frequency Fragment Separator (RFFS) to achieve a purity level suitable for decay studies. The observed production cross sections of these nuclei are lower than predicted by factors of 10 to 30. The $^{100}$Sn production cross section is 0.25(15) pb, in sharp contrast with the 120 pb lower limit established at 63 MeV/nucleon incident energy of the same primary beam. The deduced half-life of $^{100}$Sn is 0.55$^{+0.70}_{-0.31}$ s, in agreement with previous measurements. Two $β$-decaying states in $^{98}$In were observed with measured half-lives of 47(13) ms and 0.66(40) s. The half-life of $^{96}$Cd, which was the last experimentally unknown waiting point half-life of the astrophysical rp-process, is 1.03$^{+0.24}_{-0.21}$ s. The implications of the experimental T$_{1/2}$ value of $^{96}$Cd on the abundances predicted by rp-process calculations and the origin of A=96 isobars such as $^{96}$Ru are explored.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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