$ \ boldsymbol {n = 32} $ shell关闭钙下方：$^{50} $ ar的低洼结构

论文标题

$ \ boldsymbol {n = 32} $ shell关闭钙下方：$^{50} $ ar的低洼结构

$\boldsymbol{N=32}$ shell closure below calcium: Low-lying structure of $^{50}$Ar

论文作者

Cortés, M. L., Rodriguez, W., Doornenbal, P., Obertelli, A., Holt, J. D., Menéndez, J., Ogata, K., Schwenk, A., Shimizu, N., Simonis, J., Utsuno, Y., Yoshida, K., Achouri, L., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Delbart, A., Gheller, J-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kim, D., Koiwai, T., Kondo, Y., Koseoglou, P., Lee, J., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Söderström, P. -A., Sohler, D., Takeuchi, S., Toernqvist, H., Vaquero, V., Wagner, V., Wang, S., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., Zanetti, L.

论文摘要

$ n = 32 $同位素$^{50} $ ar中的低凹跃状态通过质子和中子敲除，多胡核酸的去除和质子非弹性散射后，通过光束$γ$ -Ray光谱进行了研究。已经确认了这两个先前报告的过渡的能量，首次提出了五个州，其中包括3 $^ - $州的候选人。将使用$γγ$巧合构建的水平方案与$ SD-PF $模型空间中的壳模型计算进行了比较，以及基于手性的两种和三核子相互作用的从头算预测。理论质子和中子敲除横截面表明，两个新的过渡对应于$ 2^+$状态，而先前建议的$ 4^+$状态也可能对应于$ 2^+$ state。

Low-lying excited states in the $N=32$ isotope $^{50}$Ar were investigated by in-beam $γ$-ray spectroscopy following proton- and neutron-knockout, multi-nucleon removal, and proton inelastic scattering at the RIKEN Radioactive Isotope Beam Factory. The energies of the two previously reported transitions have been confirmed, and five additional states are presented for the first time, including a candidate for a 3$^-$ state. The level scheme built using $γγ$ coincidences was compared to shell-model calculations in the $sd-pf$ model space, and to ab initio predictions based on chiral two- and three-nucleon interactions. Theoretical proton- and neutron-knockout cross sections suggest that two of the new transitions correspond to $2^+$ states, while the previously proposed $4^+$ state could also correspond to a $2^+$ state.

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