High-spin lifetime measurements in the N=Z nucleus Kr-72

C. Andreoiu, C. E. Svensson, A. V. Afanasjev, R. A. E. Austin, M. P. Carpenter, D. Dashdorj, P. Finlay, S. J. Freeman, P. E. Garrett, J. Greene, G. F. Grinyer, A. Gorgen, B. Hyland, D. Jenkins, F. Johnston-Theasby, P. Joshi, A. O. Machiavelli, F. Moore, G. Mukherjee, A. A. PhillipsW. Reviol, D. G. Sarantites, M. A. Schumaker, D. Seweryniak, M. B. Smith, J. J. Valiente-Dobon, R Wadsworth

Research output: Contribution to journalArticlepeer-review

Abstract

High-spin states in the N=Z nucleus Kr-72 have been populated in the Ca-40(Ca-40, 2 alpha)Kr-72 fusion-evaporation reaction at a beam energy of 165 MeV using the Gammasphere array for gamma-ray detection coupled to the Microball array for charged particle detection. The previously observed bands in Kr-72 were extended to an excitation energy of similar to 24 MeV and angular momentum of 30h. Using the Doppler shift attenuation method the lifetimes of high-spin states were measured for the first time. Excellent agreement between the results of calculations within the isovector mean field theory and experiment is observed both for rotational and deformation properties. No enhancement of quadrupole deformation expected in the presence of isoscalar t=0 np pairing is observed. Current data do not show any evidence for the existence of the isoscalar np pairing.

Original languageEnglish
Article number041301
Number of pages5
JournalPhysical Review C
Volume75
Issue number4
DOIs
Publication statusPublished - Apr 2007

Keywords

  • 60 MASS REGION
  • TO-Z NUCLEI
  • ROTATIONAL BANDS
  • RESPONSE CHARACTERISTICS
  • PAIRING VIBRATIONS
  • SUPERDEFORMED BAND
  • CHANNEL-SELECTION
  • GAMMASPHERE
  • DEFORMATIONS
  • SYMMETRY

Cite this