Lifetime measurements of excited states in Cr55

H. Kleis, M. Seidlitz, A. Blazhev, L. Kaya, P. Reiter, K. Arnswald, A. Dewald, M. Droste, C. Fransen, O. Möller, N. Shimizu, Y. Tsunoda, Y. Utsuno, P. von Brentano, and K. O. Zell
Phys. Rev. C 104, 034310 – Published 10 September 2021

Abstract

Excited states in Cr55 have been populated via the fusion-evaporation reaction Ca48(B11,p3n)55Cr at a beam energy of 32 MeV. The Cologne plunger device surrounded by a γ-ray detector array was employed to determine lifetimes with the recoil-distance Doppler-shift method. γ rays were observed by one Ge EUROBALL cluster detector and five HPGe detectors. γγ-coincidence data were analyzed with help from the differential decay-curve method, and precise lifetimes for the first excited states were extracted from the 5/23/2 and the 9/25/2 transitions. Reduced transition strengths B(σλ) were determined and compared to shell-model calculations employing four interactions KB3G, FPD6, GXPF1A, and GXPF1Br. The calculations were also performed for the N=31 isotonic chain from Ti53 to Zn61. Inspection of the wave functions as well as particle-plus-rotor model calculations allow for a detailed understanding of the excited states and the reduced transition strength in Cr55. The interactions GXPF1A and GXPF1Br reproduce well the experimental findings in Cr55 and in other isotones.

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  • Received 17 May 2021
  • Accepted 9 August 2021

DOI:https://doi.org/10.1103/PhysRevC.104.034310

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

H. Kleis1, M. Seidlitz1, A. Blazhev1, L. Kaya1, P. Reiter1,*, K. Arnswald1, A. Dewald1, M. Droste1, C. Fransen1, O. Möller1,2, N. Shimizu3, Y. Tsunoda3, Y. Utsuno3,4, P. von Brentano1,†, and K. O. Zell1

  • 1Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
  • 2Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  • 3Center for Nuclear Study, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

  • *Corresponding author: preiter@ikp.uni-koeln.de
  • Deceased.

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Vol. 104, Iss. 3 — September 2021

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