Phys. Rev. C 75, 064310 (2007) [10 pages]Mapping the periphery of deformation in the A∼80 region: A study of 83NbReceived 31 October 2006; published 18 June 2007 83Nb has been studied in order to locate the upper extent of large deformation in the N∼Z∼40 region and ascertain its sign and magnitude. The decay scheme has been considerably extended by studying gamma decay following the 58Ni(28Si, p2n)83Nb reaction at 204 and 215 MeV and using Gammasphere. Both signature partners of two rotational bands have been observed. The band properties support a Iπ=5/2+ ground state spin assignment. The in-band branching ratios and multipole mixing ratios were found to be consistent with significant prolate deformation, as found in other N=42 isotones. The bands are particularly similar to the isotone 81Y. A projected shell model analysis has been performed which provides good reproduction of the features of both bands. The calculations indicate the nucleus to be nearly axially symmetric. 82,83Nb may be the heaviest nuclei in the A∼80 region with large deformation. The deformation is predicted to fall in heavier systems approaching 100Sn. The conditions appear to be right for the occurrence of K isomers. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.064310
DOI:
10.1103/PhysRevC.75.064310
PACS:
27.50.+e, 23.20.Lv, 23.20.En, 21.10.Re
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.