Unbound states in 17C and p-sd shell-model interactions

Unbound states in 17C and p-sd shell-model interactions
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17C 和 p-sd 壳模型相互作用中的未结合态

DOI:
10.1016/j.physletb.2022.137629
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发表时间:
2023
期刊:
影响因子:
4.4
通讯作者:
... Kobayashi N.
... Kobayashi N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kim S.;Hwang J.W.;Satou Y.;Orr N.A.;Nakamura T.;Kondo Y.;Gibelin J.;... Kobayashi N.

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利用能量为245 MeV/核子的C18束流在碳靶上的单中子去除实验研究了C17的非束缚态。利用C16碎片和中子动量的测量结果,用不变质量谱法重建了C17在单中子衰变阈值以上的能谱,发现其共振能量分别为Er = 0.52(2),0.77(2),1.36(1),1.91(1),2.22(3)和3.20(1)MeV.在Er = 0.77(2)MeV [Ex = 1.51(3)MeV]处的共振被暂时指定为第二个5/2+态。通过与壳模型和程函反应计算的能量、截面和动量分布的比较,确定了Er = 1.91(1)和3.20(1)MeV [Ex = 2.65(2)和3.94(2)MeV]的两个共振态分别为自旋宇称为1/2 1−和3/2 1−的p壳空穴态。一个详细的比较与使用一系列的壳模型相互作用所获得的结果。的YSOX壳模型的哈密顿量,其中的跨壳层的一部分是基于基于胆固醇的普遍相互作用,被发现提供了一个很好的描述本结果和那些为邻近的奇A碳同位素,特别是负宇称跨壳层状态。
Unbound states in C 17 were investigated via one-neutron removal from a C 18 beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of C 17, above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the C 16 fragment and neutron, and was found to exhibit resonances at E r= 0.52 (2), 0.77 (2), 1.36 (1), 1.91 (1), 2.22 (3) and 3.20 (1) MeV. The resonance at E r= 0.77 (2) MeV [E x= 1.51 (3) MeV] was provisionally assigned as the second 5/2+ state. The two resonances at E r= 1.91 (1) and 3.20 (1) MeV [E x= 2.65 (2) and 3.94 (2) MeV] were identified, through comparison of the energies, cross sections and momentum distributions with shell-model and eikonal reaction calculations, as p-shell hole states with spin-parities 1/2 1− and 3/2 1−, respectively. A detailed comparison was made with the results obtained using a range of shell-model interactions. The YSOX shell-model Hamiltonian, the cross-shell part of which is based on the monopole-based universal interaction, was found to provide a very good description of the present results and those for the neighbouring odd-A carbon isotopes–in particular for the negative parity cross-shell states.
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发表时间: 2017
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