High-spin states beyond the proton drip-line: Quasiparticle alignments in Cs-113

作者：Wady P T; Smith J F^*; Hadinia B; Cullen D M; Freeman S J; Darby I G; Eeckhaudt S; Grahn T; Greenlees P T; Jones P M; Julin R; Juutinen S; Kettunen H; Leino M; Leppanen A P; McGuirk B M; Nieminen P; Nyman M; Page R D; Pakarinen J; Paul E S; Rahkila P; Rigby S V; Scholey C; Uusitalo J; Wadsworth R

来源：Physics Letters B, 2015, 740: 243-249.

DOI：10.1016/j.physletb.2014.11.045

• Proton decay
• Recoil decay tagging
• Gamma ray spectroscopy
• High-spin states
• Quasiparticle alignments

Excited states have been studied in the deformed proton emitter Cs-113. Gamma-ray transitions have been unambiguously assigned to Cs-113 by correlation with its characteristic proton decay, using the method of recoil-decay tagging. Two previously identified rotational bands have been observed and extended to tentative spins of 45/2 and 51/2 h, with excitation energies over 8 MeV above the lowest state. These are the highest angular momenta and excitation energies observed to date in any nucleus beyond the proton drip-line. Transitions in the bands have been rearranged compared to previous work. A study of aligned angular momenta, in comparison to the predictions of Woods-Saxon cranking calculations, is consistent with the most intense band being based on the pi g(7/2)[422]3/2(+) configuration, which wouldcontradict the earlier 7rh11 /2 assignment, and with the second band being based on the pi d(5/2)[420]1/2(+) configuration. The data suggest that the band based upon the pi Th-11/2 configuration is not observed.

• 出版日期2015-1-5