Effect of a Triaxial Nuclear Shape on Proton Tunneling: The Decay and Structure of Tm145

D. Seweryniak, B. Blank, M. P. Carpenter, C. N. Davids, T. Davinson, S. J. Freeman, N. Hammond, N. Hoteling, R. V. F. Janssens, T. L. Khoo, Z. Liu, G. Mukherjee, A. Robinson, C. Scholey, S. Sinha, J. Shergur, K. Starosta, W. B. Walters, A. Woehr, and P. J. Woods
Phys. Rev. Lett. 99, 082502 – Published 24 August 2007

Abstract

Gamma rays deexciting states in the proton emitter Tm145 were observed using the recoil-decay tagging method. The Tm145 ground-state rotational band was found to exhibit the properties expected for an h11/2 proton decoupled band. In addition, coincidences between protons feeding the 2+ state in Er144 and the 2+0+ γ-ray transition were detected, the first measurement of this kind, leading to a more precise value for the 2+ excitation energy of 329(1) keV. Calculations with the particle-rotor model and the core quasiparticle coupling model indicate that the properties of the πh11/2 band and the proton-decay rates in Tm145 are consistent with the presence of triaxiality with an asymmetry parameter γ20°.

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  • Received 24 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.99.082502

©2007 American Physical Society

Authors & Affiliations

D. Seweryniak1, B. Blank1,2, M. P. Carpenter1, C. N. Davids1, T. Davinson3, S. J. Freeman4, N. Hammond1, N. Hoteling5, R. V. F. Janssens1, T. L. Khoo1, Z. Liu3, G. Mukherjee1, A. Robinson3, C. Scholey6, S. Sinha1, J. Shergur5, K. Starosta7, W. B. Walters5, A. Woehr8, and P. J. Woods3

  • 1Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Centre d’Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex, France
  • 3University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
  • 4University of Manchester, Manchester M13 9PL, United Kingdom
  • 5University of Maryland, College Park, Maryland 20742, USA
  • 6University of Jyväskylä, Jyväskylä, Finland
  • 7National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
  • 8University of Notre Dame, Notre Dame, Indiana 46556, USA

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Vol. 99, Iss. 8 — 24 August 2007

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