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摘要: 利用放射性束68Fe轰击液氢靶引起的敲出反应,研究了极端丰中子核63,65,67Mn的激发态,指认了它们的自旋宇称,建立了这三个原子核的能级纲图。纲图包含11/2–、9/2–和 7/2– 三个激发态以及
$5/2_{\rm{g.s.}}^{-}$ 基态,它们由三条$\Delta I \!=\! 1$ 的$\gamma$ 跃迁连接。这种能级结构与$K \!=\! 5/2$ 时强耦合转动带的特征一致。使用改进的LNPS有效相互作用(LNPSm)的大规模壳模型计算能很好地重现观测到的能级。计算表明,65,67Mn的低位激发态都主要包含处于$4p{\text -}4h$ 的中子组态和$1p{\text -}1h$ 的质子组态。基于实验结果发现,在吸积中子星壳中,与质量数$A \!=\! 63$ 相关的Urca中微子冷却效果比预期的要强很多,而$A \!=\! 65, 67$ 的冷却效果比预期的更弱。Abstract: The excited states in 63,65,67Mn have been studied via in-beam$\gamma$ -ray spectroscopy following the knockout reaction of 68Fe by bombarding a liquid hydrogen target. Similar level schemes have been established for the three isotopes, and the level schemes consist of the 11/2–, 9/2–, 7/2– and 5/2g.s.– states, which are connected by$\Delta I = 1$ . The level sequences of 65,67Mn show features of strongly coupled rotational band with$K^{\pi} = 5/2^{-}$ expected for the well deformed nuclei. Large-scale shell-model calculations using the modified LNPS (LNPSm) effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole ($4p-4h$ ) neutron configurations and 1-particle-1-hole ($1p-1h$ ) proton configurations for all the states. The experimental results show an enhancement of Urca neutrino cooling in the accreted neutron crust associated with$A = 63$ nuclei and rule out significant cooling from$A = 65,67$ .-
Key words:
- in-beam γ-ray spectroscopy /
- island of inversion /
- neutron-rich nuclei /
- shell evolution
-
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丰中子核63,65,67Mn的在束γ谱学研究
doi: 10.11804/NuclPhysRev.37.2019CNPC55
- 收稿日期: 2020-01-15
- 修回日期: 2020-04-23
- 网络出版日期: 2020-09-30
- 刊出日期: 2020-09-20
摘要: 利用放射性束68Fe轰击液氢靶引起的敲出反应,研究了极端丰中子核63,65,67Mn的激发态,指认了它们的自旋宇称,建立了这三个原子核的能级纲图。纲图包含11/2–、9/2–和 7/2– 三个激发态以及
English Abstract
In-beam γ Spectroscopy of Neutron-rich 63,65,67Mn
- Received Date: 2020-01-15
- Rev Recd Date: 2020-04-23
- Available Online: 2020-09-30
- Publish Date: 2020-09-20
Abstract: The excited states in 63,65,67Mn have been studied via in-beam
引用本文: | 卢洪洋, 刘小雨, 丁兵, 刘忠, P.Doornenbal, A.Obertelli, S. M.Lenzi, P. M.Walker, L. X.Chung, B. D.Linh, G.Authelet, H.Baba, D.Calvet, F.Château, A.Corsi, A.Delbart, J. M.Gheller, A.Gillibert, T.Isobe, V.Lapoux, M.Matsushita, S.Momiyama, T.Motobayashi, M.Niikura, F.Nowacki, H.Otsu, C.Péron, A.Peyaud, E. C.Pollacco, J. Y.Roussé, H.Sakurai, M.Sasano, Y.Shiga, S.Takeuchi, R.Taniuchi, T.Uesaka, H.Wang, K.Yoneda. 丰中子核63,65,67Mn的在束γ谱学研究[J]. 原子核物理评论, 2020, 37(3): 548-553. doi: 10.11804/NuclPhysRev.37.2019CNPC55 |
Citation: | Hongyang LU, Xiaoyu LIU, Bing DING, Zhong LIU, Doornenbal P., Obertelli A., Lenzi S. M., Walker P. M., Chung L. X., Linh B. D., Authelet G., Baba H., Calvet D., Château F., Corsi A., Delbart A., Gheller J.M., Gillibert A., Isobe T., Lapoux V., Matsushita M., Momiyama S., Motobayashi T., Niikura M., Nowacki F., Otsu H., Péron C., Peyaud A., Pollacco E. C., Roussé J. Y., Sakurai H., Sasano M., Shiga Y., Takeuchi S., Taniuchi R., Uesaka T., Wang H., Yoneda K.. In-beam γ Spectroscopy of Neutron-rich 63,65,67Mn[J]. Nuclear Physics Review, 2020, 37(3): 548-553. doi: 10.11804/NuclPhysRev.37.2019CNPC55 |