论文标题
17C和P-SD壳模型相互作用的未结合状态
Unbound states in 17C and p-sd shell-model interactions
论文作者
论文摘要
通过从18C束上的单中子除去碳靶的245 meV/核，研究了17C中的未结合状态。在单中性衰减阈值上方的17C的能量光谱是使用从16c片段和中子的测得的力量的不变质谱进行重建的，并被发现在ER = 0.52（2），0.77（2），0.77（2），0.77（2），1.36（1），1.36（1），1.91（1），1.91（1）（1），2.22（3）和3.20（3）和3.20（1）（1）（1） ER = 0.77（2）MEV [EX = 1.51（3）MEV]的共振被临时分配为第二个5/2+状态。 ER = 1.91（1）和3.20（1）MEV [EX = 2.65（2）和3.94（2）MEV]的两个共鸣通过比较能量，横截面和动量分布与Shell-Model和Eikonal反应计算的能量，横截面和动量分布，作为具有旋转孔状态的shell-Model和Eikonal反应计算。进行了详细的比较与使用一系列壳模型相互作用获得的结果进行了详细的比较。发现YSOX壳模型哈密顿量是基于基于单极的通用相互作用的交叉壳部分，可提供对当前结果的很好描述以及相邻的奇数 - A碳同位素 - 特别是平均跨性别壳状态。
Unbound states in 17C were investigated via one-neutron removal from a 18C beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of 17C, above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the 16C fragment and neutron, and was found to exhibit resonances at Er=0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at Er=0.77(2) MeV [Ex=1.51(3) MeV] was provisionally assigned as the second 5/2+ state. The two resonances at Er=1.91(1) and 3.20(1) MeV [Ex=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- and 3/2-, 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.
