4.8 Article

Shape Changes in the Mirror Nuclei 70Kr and 70Se

Journal

PHYSICAL REVIEW LETTERS
Volume 126, Issue 7, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.072501

Keywords

-

Funding

  1. UK STFC [ST/L005727/1, ST/P003885/1]
  2. Spanish Ministerio de Economia y Competitividad [RYC-2017-22007, FPA2011-24553, FPA2014-52823-C2-1-P]
  3. Program Severo Ochoa [SEV-2014-0398]
  4. Spanish MICINN [PGC2018-094583-B-I00]
  5. European Research Council through the ERC [MINOS-258567]

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Study of the proton-rich T-z = -1 nucleus Kr-70 through inelastic scattering reveals a deviation in the electromagnetic matrix elements compared to other isotopes Br-70 and Se-70, suggesting a violation of isospin symmetry at this level not previously observed. Current nuclear structure theories are unable to quantitatively explain this anomaly, possibly indicating a shape change between Kr-70 and Se-70 contrary to model predictions.
We studied the proton-rich T-z = -1 nucleus Kr-70 through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2; 0+ -> 2+). Comparison with the other members of the A = 70 isospin triplet, Br-70 and Se-70, 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 Kr-70 and Se-70 contrary to the model predictions.

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