Near yrast discrete line gamma-ray spectroscopy in 156Dy up to spin 40kh

doi:10.1016/0375-9474(88)90246-1

Nuclear Physics A

Volume 486, Issue 2, 12 September 1988, Pages 456-492

https://doi.org/10.1016/0375-9474(88)90246-1 Get rights and content

Abstract

Rotational band structures in ¹⁵⁶Dy have been populated via the reactions ¹⁴⁸Nd(¹²C, 4n) and ¹²⁴Sn(³⁶S, 4n) at beam energies of 65 MeV and 155 MeV, respectively. High-spin states (I ≳ 40kh) have been observed and a detailed level scheme is presented. Two positive-parity bands have been observed to spins I = 42 and 36. Four negative-parity bands have been identified up to or above spin I = 36. New levels are also observed in octupole and gamma vibrational bands. The band structures are understood in terms of quasiparticle configurations using the cranked-shell model. The second and third i_$132$ neutron alignments, the systematics of the first h_$112$ proton alignments in even-even N = 90 isotones and the observation of a third discontinuity in the lowest energy positive- and negative-parity bands near spin 40 in ¹⁵⁶Dy are discussed.

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Spin ∼ 60 ℏ in 156Dy: Competition between collective and terminating structures at very high-spin
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The highest-spin discrete states (I∼60 ℏ and E_x∼30 MeV) in normal deformed nuclei have been observed in the rare-earth isotope ¹⁵⁶Dy using the ¹²⁴Sn(³⁶S,4n) reaction in conjunction with the GAMMASPHERE spectrometer. The positive parity yrast sequence appears to evolve smoothly from a prolate (collective) towards an oblate (non-collective) shape, in contrast to the sudden shape change observed in the isotone ¹⁵⁸Er. Terminating states are identified in the negative parity sequences at I^π=52⁻ and 53⁻ and specific multi-particle-hole configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. An order of magnitude increase in the interaction strength between close lying high-spin weakly collective structures is determined compared with that found in the lower-spin strongly collective domain. These results give valuable insight into the interplay between collective and terminating structures, and their competition for yrast status in the 40−60 ℏ spin range.
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¹: Present address: SERC, Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK.

²: Present address: ICI Ltd., Runcorn, Cheshire, UK.

³: Present address: Admiral Computing Ltd., Camberly, Surrey, UK.

⁴: Present address: John Caunt Scientific Ltd., Eynsham, Oxford, UK.

⁵: Present address: SUNY, Stony Brook, NY, USA.

⁶: Present address: Department of Physics, University of Surrey, Guildford, Surrey, UK.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 156

Nuclear data sheets for A = 156

Spin ∼ 60 ℏ in <sup>156</sup>Dy: Competition between collective and terminating structures at very high-spin

Transition energy staggering and band interaction in rare-earth nuclei

Exploring the I = 50-60(Latin small letter h with stroke) domain: Collective and terminating structures in <sup>156</sup>Dy, <sup>159</sup>Er and <sup>160</sup>Er

Evolution of structure and shapes in Er 158 to ultrahigh spin