Abstract
Background: Nuclei approaching N=Z=40 are known to exhibit strongly deformed structures and are thought to be candidates for shape coexistence. In the krypton isotopes, Kr80,82 are poorly characterized, preventing an understanding of evolving deformation approaching N=40. Purpose: The present work aims to determine electric quadrupole transition strengths and quadrupole moments of Kr80,82 in order to better characterize their deformation. Methods: Sub-barrier Coulomb excitation was employed, impinging the isotopes of krypton on Pt196 and Pb208 targets. Utilizing a semiclassical description of the safe Coulomb-excitation process E2 matrix elements could then be determined. Results: Eleven new or improved matrix elements are determined in Kr80 and seven in Kr82. The new B(E2;01+→21+) value in Kr82 disagrees with the evaluated value by 3σ, which can be explained in terms of deficiencies in a previous Coulomb-excitation analysis. Conclusions: Comparison of measured Qs(21+) and B(E2;01+→21+) values indicates that neutron-deficient (N≤42) isotopes of krypton are closer to axial deformation than other isotopic chains in the mass region. A continuation of this trend to higher Z may result in Sr and Zr isotopes exhibiting near-axial prolate deformation.1 MoreReceived 19 July 2021Revised 1 September 2021Accepted 28 September 2021DOI:https://doi.org/10.1103/PhysRevC.104.044313©2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCollective levelsElectromagnetic transitionsSpectroscopic factors & electromagnetic momentsProperties59 ≤ A ≤ 89Nuclear Physics
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