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

In-beam $γ$ -ray spectroscopy of ${}^{62, 64}{Cr}$

A. Gade, R. V. F. Janssens, D. Bazin, P. Farris, A. M. Hill, S. M. Lenzi, J. Li, D. Little, B. Longfellow, F. Nowacki, A. Poves, D. Rhodes, J. A. Tostevin, and D. Weisshaar

Phys. Rev. C 103, 014314 – Published 20 January 2021

Abstract

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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Received 8 September 2020
Accepted 11 January 2021

DOI:https://doi.org/10.1103/PhysRevC.103.014314

Physics Subject Headings (PhySH)

Collective levels Electromagnetic transitions Nuclear structure & decays Shell model Unstable nuclei induced nuclear reactions

59 ≤ A ≤ 89

Nuclear Physics

Authors & Affiliations

A. Gade ^1,2, R. V. F. Janssens ^3,4, D. Bazin ^1,2, P. Farris^1,2, A. M. Hill^1,2, S. M. Lenzi⁵, J. Li¹, D. Little^3,4, B. Longfellow^1,2,*, F. Nowacki^6,7, A. Poves ⁸, D. Rhodes^1,2, J. A. Tostevin ⁹, and D. Weisshaar ¹

¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
²Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
⁴Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
⁵Dipartimento di Fisica e Astronomia dell'Università and INFN, Sezione di Padova, I-35131 Padova, Italy
⁶Universitè de Strasbourg, IPHC, 23 Rue du Loess 67037 Strasbourg, France
⁷CNRS, UMR7178, 67037 Strasbourg, France
⁸Departamento de Física Teórica e IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
⁹Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

^*Present address: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

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Vol. 103, Iss. 1 — January 2021

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Physical Review C

covering nuclear physics

In-beam $γ$ -ray spectroscopy of ${}^{62, 64}{Cr}$

A. Gade, R. V. F. Janssens, D. Bazin, P. Farris, A. M. Hill, S. M. Lenzi, J. Li, D. Little, B. Longfellow, F. Nowacki, A. Poves, D. Rhodes, J. A. Tostevin, and D. Weisshaar

Phys. Rev. C 103, 014314 – Published 20 January 2021

Abstract

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Physical Review C

covering nuclear physics

In-beam γ-ray spectroscopy of Cr62,64

A. Gade, R. V. F. Janssens, D. Bazin, P. Farris, A. M. Hill, S. M. Lenzi, J. Li, D. Little, B. Longfellow, F. Nowacki, A. Poves, D. Rhodes, J. A. Tostevin, and D. Weisshaar

Phys. Rev. C 103, 014314 – Published 20 January 2021

Abstract

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In-beam $γ$ -ray spectroscopy of ${}^{62, 64}{Cr}$