Physics Letters B (Sep 2018)

Spectroscopy of 2565,67Mn: Strong coupling in the N = 40 “island of inversion”

  • X.Y. Liu,
  • Z. Liu,
  • B. Ding,
  • 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,
  • Y.H. Lam,
  • T.H. Huang,
  • M.D. Sun,
  • W.Q. Zhang,
  • H.Y. Lu,
  • D.S. Hou,
  • F. Browne,
  • Zs. Dombradi,
  • S. Franchoo,
  • F. Giacoppo,
  • A. Gottardo,
  • K. Hadynska-Klek,
  • Z. Korkulu,
  • S. Koyama,
  • Y. Kubota,
  • J. Lee,
  • M. Lettmann,
  • R. Lozeva,
  • K. Matsui,
  • T. Miyazaki,
  • S. Nishimura,
  • C. Louchart,
  • L. Olivier,
  • S. Ota,
  • Z. Patel,
  • E. Sahin,
  • C. Santamaria,
  • C. Shand,
  • P.-A. Söderström,
  • G.L. Stefan,
  • D. Steppenbeck,
  • T. Sumikama,
  • D. Suzuki,
  • Zs. Vajta,
  • V. Werner,
  • J. Wu,
  • Z. Xu,
  • X.H. Zhou,
  • Y.H. Zhang,
  • H.S. Xu,
  • F.S. Zhang

Journal volume & issue
Vol. 784
pp. 392 – 396

Abstract

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Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2g.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 the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass 53−67Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the β stability line. These results help to deepen our understanding of the N=40 “island of inversion”. Keywords: In-beam γ-ray spectroscopy, “Island of inversion” around N=40, Strong coupling, Structure evolution