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Article Dans Une Revue Physical Review C Année : 2021

In-beam $\gamma$-ray spectroscopy of $^{62,64}\mathrm{Cr}$

A. Gade
R. V F Janssens
D. Bazin
P. Farris
  • Fonction : Auteur
A. M Hill
S. M Lenzi
  • Fonction : Auteur
J. Li
  • Fonction : Auteur
D. Little
  • Fonction : Auteur
B. Longfellow
  • Fonction : Auteur
A. Poves
D. Rhodes
  • Fonction : Auteur
J. A Tostevin
D. Weisshaar

Résumé

The region of neutron-rich Cr isotopes has garnered much attention in recent years due to a rapid onset of collectivity near neutron number N = 40. We report here on the first γ-ray spectroscopy beyond the (4 + 1) state in 62,64 Cr, using nucleon removal reactions from several projectiles within a rare-isotope beam cocktail. A candidate for the 6 + state in 64 Cr is presented as well as one for, possibly, the second excited 0 + state in 62 Cr. The results are discussed in comparison to the LNPS shell-model predictions that allow for neutron excitations across the N = 40 harmonic oscillator gap into the g 9/2 and d 5/2 orbitals. The calculated level schemes for 62,64 Cr reveal intriguing collective structures. From the predicted neutron particle-hole character of the low-lying states in these Cr isotopes, 62 Cr emerges as a transitional system on the path to the center of the N = 40 island of inversion.
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Dates et versions

hal-03371937 , version 1 (09-10-2021)

Identifiants

Citer

A. Gade, R. V F Janssens, D. Bazin, P. Farris, A. M Hill, et al.. In-beam $\gamma$-ray spectroscopy of $^{62,64}\mathrm{Cr}$. Physical Review C, 2021, 103 (1), pp.014314. ⟨10.1103/PhysRevC.103.014314⟩. ⟨hal-03371937⟩
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