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Träfflista för sökning "WFRF:(Joss DT) srt2:(2005-2009)"

Sökning: WFRF:(Joss DT) > (2005-2009)

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1.
  • Bentley, MA, et al. (författare)
  • High-spin spectroscopy of natural and unnatural parity states in the mirror-pair V-45/Ti-45
  • 2006
  • Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 73:2: 024304
  • Tidskriftsartikel (refereegranskat)abstract
    • High-spin states in the proton-rich nucleus V-45 have been identified for the first time. A comprehensive gamma-ray decay scheme has been established following an experiment performed at the Vivitron accelerator at IReS Strasbourg by using the Euroball gamma-ray detector array coupled to the Neutron Wall and Euclides detector arrays. The natural (negative-) parity scheme is identified up to the f(7/2) band termination in addition to a positive-parity collective structure based on a d(3/2) particle-hole excitation. Comparison of this scheme with that of the mirror partner, Ti-45, 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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2.
  • Evans, AO, et al. (författare)
  • High-spin structure in Er-157 up to and above band termination
  • 2006
  • Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 73:6
  • Tidskriftsartikel (refereegranskat)abstract
    • The high-spin structure of Er-157 has been greatly expanded using the Gammasphere spectrometer to investigate the Cd-114(Ca-48,5n) reaction at 215 MeV. Many new transitions have been placed in a greatly augmented level scheme up to spin 40h with many collective rotational sequences established. With increasing angular momentum, this nucleus undergoes a Coriolis-induced shape transition from a deformed state of collective rotation to a noncollective configuration. This transition manifests itself as favored band termination near I=45h in three rotational structures. Many weakly populated states lying at high excitation energy that decay into the terminating states have been discovered. Cranked-Nilsson-Strutinsky calculations suggest that the levels that feed the terminating states arise from weakly collective configurations that break the Z=64 semimagic core.
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