High-spin studies of N similar to Z nuclei in the mass 70 region

NS Kelsall*, CE Svensson, S Fischer, DE Appelbe, RAE Austin, DP Balamuth, GC Ball, JA Cameron, MP Carpenter, RM Clark, M Cromaz, MA Deleplanque, RM Diamond, JL Durell, P Fallon, SJ Freeman, PA Hausladen, DF Hodgson, RVF Janssens, DG JenkinsGJ Lane, MJ Leddy, CJ Lister, AO Macchiavelli, CD O'Leary, DG Sarantites, FS Stephens, DC Schmidt, D Seweryniak, BJ Varley, S Vincent, K Vetter, JC Waddington, R Wadsworth, D Ward, A Wilson, AV Afanasjev, S Frauendorf, I Ragnarsson, R Wyss

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High-spin states have been studied in Kr-72,Kr-73 using (Ca+Ca)-Ca-40-Ca-40 and (Ar+Ca)-Ar-36-Ca-40 reactions at 160, 164 and 145 MeV respectively. The properties and configurations of the bands observed are interpreted with the aid of unpaired cranked Nilsson-Strutinsky/ cranked relativistic mean-field calculations and paired total routhian surface and cranked relativistic Hartree-Bogoliubov calculations. In Kr-73 the three previously known structures have been extended to a spin of similar to30h and a fourth structure, which is believed to be the signature partner to the g(9/2) band, has been identified. The negative parity bands show evidence for an unusual type of band crossing. It is currently unclear whether this is a consequence of T=0 n-p pairing. At the highest spins the unpaired calculations can reproduce the observed data, suggesting that there is little evidence for pairing correlations in this spin regime. In Kr-72 a new band has been identified that has the properties expected from the missing doubly aligned S-band configuration. The properties of this band can be reproduced by the unpaired CNS/ CRMF calculations, again suggesting that the structure has little pairing. However, paired calculations appear to be necessary to reproduce the properties of the previously known structure in this nucleus. The Kr-72 results are also compared with projected shell model calculations.

Original languageEnglish
Title of host publicationFRONTIERS OF NUCLEAR STRUCTURE
EditorsP Fallon, R Clark
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Pages261-268
Number of pages8
ISBN (Print)0-7354-0116-0
Publication statusPublished - 2003
EventConference on Frontiers of Nuclear Structure - BERKELEY, Canada
Duration: 29 Jul 20022 Aug 2002

Publication series

NameAIP CONFERENCE PROCEEDINGS
PublisherAMER INST PHYSICS
Volume656
ISSN (Print)0094-243X

Conference

ConferenceConference on Frontiers of Nuclear Structure
Country/TerritoryCanada
CityBERKELEY
Period29/07/022/08/02

Keywords

  • KR-72
  • = Z NUCLEI
  • SE-68
  • ALIGNMENT
  • N=Z NUCLEUS
  • MEAN-FIELD
  • FORMALISM
  • ART.
  • GAMMA-RAY SPECTROSCOPY
  • ROTATIONAL BANDS

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