Spectroscopy of 63,65,67Mn: Strong Coupling in the N=40 Island of Inversion and Improved Constraints for Urca Cooling in the Accreted Neutron Star Crust

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Kunibiki Messe (Matsue)

Kunibiki Messe


Oral contribution


Prof. zhong liu (IMP,CAS)


Excited states in 63;65;67Mn were studied via in-beam gamma-ray spectroscopy following the knockout reaction from 68Fe. Similar level schemes, consisting of the 11/2-, 9/2-, 7/2- and 5/2- g.s. level sequence, connected by I → I − 1 transitions, were established, the first time for 65;67Mn. Their level structures show features consistent with strongly-coupled rotational bands with K = 5/2. State-of-the-art shell-model calculations with the modified LNPS effective interaction reproduce the
observed levels remarkably well and suggest 4p−4h neutron and 1p−1h proton configurations for all the states. The data on the low-lying excited states of 53-67Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain. Our results enhance Urca neutrino cooling from e−capture/beta−decay cycles in the accreted neutron star crust associated with A = 63 nuclei and experimentally rule-out significant cooling from A = 65, 67. This improves constraints that can be made on past surface nuclear burning on accreting neutron stars with observed quiescent cooling light curves.

Primary author

Prof. zhong liu (IMP,CAS)


Mr Liu xiaoyu (IMP, CAS)

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