Identification of significant E0 strength in the 22 +→21 + transitions of 58,60,62Ni

L. J. Evitts, A. B. Garnsworthy, T. Kibédi, J. Smallcombe, M. W. Reed, B. A. Brown, A. E. Stuchbery, G. J. Lane, T. K. Eriksen, A. Akber, B. Alshahrani, M. de Vries, M. S.M. Gerathy, J. D. Holt, B. Q. Lee, B. P. McCormick, A. J. Mitchell, M. Moukaddam, S. Mukhopadhyay, N. PalalaniT. Palazzo, E. E. Peters, A. P.D. Ramirez, S. R. Stroberg, T. Tornyi, S. W. Yates

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The E0 transition strength in the 22 +→21 + transitions of 58,60,62Ni have been determined for the first time following a series of measurements at the Australian National University (ANU) and the University of Kentucky (UK). The CAESAR Compton-suppressed HPGe array and the Super-e solenoid at ANU were used to measure the δ(E2/M1) mixing ratio and internal conversion coefficient of each transition following inelastic proton scattering. Level half-lives, δ(E2/M1) mixing ratios and γ-ray branching ratios were measured at UK following inelastic neutron scattering. The new spectroscopic information was used to determine the E0 strengths. These are the first 2+→2+ E0 transition strengths measured in nuclei with spherical ground states and the E0 component is found to be unexpectedly large; in fact, these are amongst the largest E0 transition strengths in medium and heavy nuclei reported to date.

Original languageEnglish
Pages (from-to)396-401
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume779
DOIs
StatePublished - Apr 10 2018

Bibliographical note

Funding Information:
We would like to thank the technical staff of the Heavy Ion Accelerator Facility at the Australian National University, and in particular Justin Heighway for preparing the nickel targets. A.B.G. is grateful for support from the Department of Nuclear Physics of the Australian National University . This work was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC); the National Science Foundation , Grants No. PHY-1404442 and PHY-1606890 ; and by the Australian Research Council Discovery Grants DP140102986 and FT100100991 . TRIUMF receives funding via a contribution agreement through the National Research Council Canada .

Funding Information:
We would like to thank the technical staff of the Heavy Ion Accelerator Facility at the Australian National University, and in particular Justin Heighway for preparing the nickel targets. A.B.G. is grateful for support from the Department of Nuclear Physics of the Australian National University. This work was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC); the National Science Foundation, Grants No. PHY-1404442 and PHY-1606890; and by the Australian Research Council Discovery Grants DP140102986 and FT100100991. TRIUMF receives funding via a contribution agreement through the National Research Council Canada.

Publisher Copyright:
© 2018 The Author(s)

Keywords

  • Electric monopole (E0) transitions
  • Internal conversion
  • Mixing ratios
  • Nuclear structure

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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