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Shape changes in the mirror nuclei $^{70}$Kr and $^{70}$Se

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Author(s)

  • K. Wimmer
  • W. Korten
  • P. Doornenbal
  • T. Arici
  • P. Aguilera
  • A. Algora
  • T. Ando
  • H. Baba
  • B. Blank
  • A. Boso
  • S. Chen
  • A. Corsi
  • G. de Angelis
  • G. de France
  • J. -P. Delaroche
  • J. Gerl
  • R. Gernhäuser
  • M. Girod
  • S. Koyama
  • T. Motobayashi
  • S. Nagamine
  • M. Niikura
  • A. Obertelli
  • J. Libert
  • D. Lubos
  • T. R. Rodríguez
  • B. Rubio
  • E. Sahin
  • T. Y. Saito
  • H. Sakurai
  • L. Sinclair
  • D. Steppenbeck
  • M. Zielinska

Department/unit(s)

Publication details

JournalPhysical Review Letters
DateAccepted/In press - 7 Jan 2021
Original languageEnglish

Abstract

We studied the proton-rich $T_z=-1$ nucleus $^{70}$Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, $B(E2;\;0^+ \rightarrow 2^+)$. Comparison with the other members of the $A=70$ isospin triplet, $^{70}$Br and $^{70}$Se, studied in the same experiment, shows a $3\sigma$ deviation from the expected linearity of the electromagnetic matrix elements as a function of $T_z$. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei $^{70}$Kr and $^{70}$Se contrary to the model predictions.

Bibliographical note

accepted PRL

    Research areas

  • nucl-ex, nucl-th

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