Mirror symmetry at mass A = 54: E4 effective charges near doubly magic 56Ni

D. Rudolph, B. Blank, J. Giovinazzo, T. Roger, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. PibernatJ. Piot, Olivier Sorlin, C. Stodel, J.-C. Thomas, M. Versteegen

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Abstract

Proton-emission branches of the 10+ isomer in the Tz=−1 nucleus 54Ni have been imaged with the active target and time projection chamber (ACTAR TPC) in an experiment conducted at the Grand Accélérateur National d'Ions Lourds (GANIL). The completed decay scheme allows derivation of the reduced transition strengths, B(E2;10+→8+) and B(E4;10+→6+), for the two competing γ-ray transitions. By means of a comparison with their well-known ‘mirror transitions’ in Tz=+1 54Fe, and aided by a variety of shell-model calculations in the fp model space, effective charges for E4 transitions near N=Z 56Ni can be deduced: επ≈1.40 and εν≈0.30. Mirror-energy differences are explored with various shell-model interactions and isospin-symmetry breaking terms.
Original languageEnglish
Article number137144
Number of pages5
JournalPhysics Letters B
Volume830
DOIs
Publication statusPublished - 2022 May 11

Subject classification (UKÄ)

  • Subatomic Physics

Keywords

  • 54Ni
  • Nuclear shell model
  • Isospin symmetry
  • Electromagnetic decay
  • E4 transition
  • Effective charges

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