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Träfflista för sökning "WFRF:(Nolan Paul) srt2:(2015-2019)"

Sökning: WFRF:(Nolan Paul) > (2015-2019)

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  • 2019
  • Tidskriftsartikel (refereegranskat)
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  • Hartley, D. J., et al. (författare)
  • Persistence of collective behavior at high spin in the N=88 nucleus Tb-153
  • 2015
  • Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 91:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Excited states in the N = 88 nucleus Tb-153 were observed up to spin similar to 40 in an experiment utilizing the Gammasphere array. The Tb-153 states were populated in a weak alpha 4n evaporation channel of the Cl-37 + Sn-124 reaction. Two previously known sequences were extended to higher spins, and a new decoupled structure was identified. The pi h(11/2) band was observed in the spin region where other N = 88 isotopes exhibit effects of prolate to oblate shape changes leading to band termination along the yrast line, whereas Tb-153 displays a persistent collective behavior. However, minor perturbations of the very highest state in both signatures of this h(11/2) band are observed, which perhaps signal the start of the transition towards band termination.
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  • Paul, E. S., et al. (författare)
  • Recent Results at Ultrahigh Spin: Terminating States and Beyond in Mass 160 Rare-earth Nuclei
  • 2015
  • Ingår i: Acta Physica Polonica. Series B: Elementary Particle Physics, Nuclear Physics, Statistical Physics, Theory of Relativity, Field Theory. - 0587-4254. ; 46:3, s. 487-496
  • Tidskriftsartikel (refereegranskat)abstract
    • A classic region of band termination at high spin occurs in rare-earth nuclei with around ten valence nucleons above the Gd-146 closed core. Results are presented here for such non-collective oblate (gamma = 60 degrees) terminating states in odd-Z Ho-155, odd-odd Ho-156, and even-even Er-156, where they are compared with neighbouring nuclei. In addition to these particularly favoured states, the occurrence of collective triaxial strongly deformed (TSD) bands, bypassing the terminating states and extending to over 65 (h) over bar, is reviewed.
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7.
  • Rees, J. M., et al. (författare)
  • High-spin terminating states in the N=88 Ho-155 and Er-156 isotones
  • 2015
  • Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 91:5
  • Tidskriftsartikel (refereegranskat)abstract
    • The Sn-124(Cl-37, 6n gamma) fusion-evaporation reaction at a bombarding energy of 180 MeV has been used to significantly extend the excitation level scheme of Ho-155(67)88. The collective rotational behavior of this nucleus breaks down above spin I similar to 30 and a fully aligned noncollective (band terminating) state has been identified at I-pi = 79/2(-). Comparison with cranked Nilsson-Strutinsky calculations also provides evidence for core-excited noncollective states at I-pi = 87/2(-) and (89/2(+)) involving particle-hole excitations across the Z = 64 shell gap. A similar core-excited state in Er-156(68)88 at I-pi = (46(+)) is also presented.
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