High-spin spectroscopy of natural and unnatural parity states in the mirror-pair V45/Ti45

M. A. Bentley, C. Chandler, P. Bednarczyk, F. Brandolini, A. M. Bruce, D. Curien, O. Dorvaux, J. Ekman, E. Farnea, W. Gelletly, D. T. Joss, S. M. Lenzi, D. R. Napoli, J. Nyberg, C. D. O'Leary, S. J. Williams, and D. D. Warner
Phys. Rev. C 73, 024304 – Published 8 February 2006

Abstract

High-spin states in the proton-rich nucleus V45 have been identified for the first time. A comprehensive γ-ray decay scheme has been established following an experiment performed at the Vivitron accelerator at IReS Strasbourg by using the Euroball γ-ray detector array coupled to the Neutron Wall and Euclides detector arrays. The natural (negative-) parity scheme is identified up to the f7/2 band termination in addition to a positive-parity collective structure based on a d3/2 particle-hole excitation. Comparison of this scheme with that of the mirror partner, Ti45, has yielded detailed information on the variation of Coulomb energy as a function of excitation energy and angular momentum. This is the first time that such an analysis has been performed for a collective structure built on a cross-shell excitation. Comparison of the observed Coulomb energies with those predicted by large-scale shell-model calculations is presented. In this case, unusually, the calculations do not fare as well as for heavier nuclei in the shell. In addition, stark differences between the two nuclei are observed for the decay intensities of the parity-changing E1 decays that de-excite the positive-parity deformed bands.

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  • Received 28 September 2005

DOI:https://doi.org/10.1103/PhysRevC.73.024304

©2006 American Physical Society

Authors & Affiliations

M. A. Bentley1,2,*, C. Chandler2, P. Bednarczyk3,4, F. Brandolini5, A. M. Bruce6, D. Curien3, O. Dorvaux3, J. Ekman7,8, E. Farnea5, W. Gelletly9, D. T. Joss10, S. M. Lenzi5, D. R. Napoli11, J. Nyberg12, C. D. O'Leary1,13, S. J. Williams2,9, and D. D. Warner10

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2School of Chemistry and Physics, Keele University, Keele, Staffordshire, ST5 5BG, United Kingdom
  • 3IReS, 23 rue du Loess, BP 28 F-67037, Strasbourg, France
  • 4Niewodniczanski Institute of Nuclear Physics, PL-31342 Krakow, Poland
  • 5Departimento di Fisica dell'Università and INFN, Sezione di Padova, I-35141 Padova, Italy
  • 6School of Engineering, University of Brighton, Brighton, BN2 4GJ, United Kingdom
  • 7Department of Physics, Lund University, S-22100 Lund, Sweden
  • 8Teknik och Samhälle, Malmö Högskola, 20506 Malmö, Sweden
  • 9School of Physics and Chemistry, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
  • 10CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
  • 11INFN, Laboratori Nazionali di Legnaro, Italy
  • 12Department of Radiation Sciences, Uppsala University, Uppsala, Sweden
  • 13Ultra Electronics, Armitage Road, Rugeley, Staffordshire WS15 1DR, United Kingdom

  • *Electronic address: mab503@york.ac.uk

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Vol. 73, Iss. 2 — February 2006

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