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arXiv 2003.10363nucl-exnucl-th
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单核子敲除反应研究PDMATHAAC Co的$T = 1$、$J^π = 6^+$态和$A = 54$的同位旋对称性

Experimental identification of the $T = 1$, $J^π = 6^+$ state of $^{54}$Co and isospin symmetry in $A = 54$ studied via one-nucleon knockout reactions

M. Spieker, D. Weisshaar, A. Gade, B. A. Brown, P. Adrich, D. Bazin, M. A. Bentley, J. R. Brown, C. M. Campbell, C. Aa. Diget, B. Elman, T. Glasmacher, M. Hill,… 展开作者

M. Spieker, D. Weisshaar, A. Gade, B. A. Brown, P. Adrich, D. Bazin, M. A. Bentley, J. R. Brown, C. M. Campbell, C. Aa. Diget, B. Elman, T. Glasmacher, M. Hill, B. Longfellow, B. Pritychenko, A. Ratkiewicz, D. Rhodes, J. A. Tostevin

摘要:

本文介绍了从$^{55}$ Co中进行的$γ$射线标记的单中子和单质子敲除的新实验数据。在$^{54}$ Fe上的新数据的比较的基础上,提出了一个候选人的抢手的$T=1, T_z = 0, J^π = 6^+$状态在$^{54}$ Co,相应的观测值预测的大规模壳模型(LSSM)计算在整个$fp$模型空间采用电荷依赖的贡献,和同位旋对称性参数。此外,可能的同位旋对称性破缺的$A=54$,$T=1$三重态进行了研究,通过计算的实验$c$系数的等压质量多重态方程(IMME)的最大可能的自旋$J=6$预期的$(1f_{7/2})^{-2}$双空穴配置相对于双幻核$^{56}$ Ni。实验量进行比较,从LSSM计算使用两体矩阵元素从一个现实的手征有效场理论潜在的下一个到领先的顺序(N $^3$ LO)的理论预测的$c$系数。

英文摘要:

New experimental data obtained from $γ$-ray tagged one-neutron and one-proton knockout from $^{55}$Co is presented. A candidate for the sought-after $T=1, T_z = 0, J^π = 6^+$ state in $^{54}$Co is proposed based on a comparison to the new data on $^{54}$Fe, the corresponding observables predicted by large-scale-shell-model (LSSM) calculations in the full $fp$-model space employing charge-dependent contributions, and isospin-symmetry arguments. Furthermore, possible isospin-symmetry breaking in the $A=54$, $T=1$ triplet is studied by calculating the experimental $c$ coefficients of the isobaric mass multiplet equation (IMME) up to the maximum possible spin $J=6$ expected for the $(1f_{7/2})^{-2}$ two-hole configuration relative to the doubly-magic nucleus $^{56}$Ni. The experimental quantities are compared to the theoretically predicted $c$ coefficients from LSSM calculations using two-body matrix elements obtained from a realistic chiral effective field theory potential at next-to-next-to-next-to-leading order (N$^3$LO).

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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