Structural behavior of {sup 157,158,159}Dy in the I=30-50({Dirac_h}/2{pi}) spin regime

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.064307· OSTI ID:20771084

Pipidis, A; Riley, M A; Campbell, D B ^[1]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

Significant extensions to the high-spin excitation spectrum of the N=91, 92, 93 isotopes {sup 157,158,159}Dy have been achieved using the high-efficiency {gamma}-ray spectrometers Euroball and Gammasphere. These nuclei were populated via weak 3n or {alpha}xn exit channels in fusion evaporation reactions. In {sup 157}Dy, the yrast band has been extended to I{sup {pi}}=(101/2){sup +} (tentatively to (105/2){sup +}) with four sideband structures (two of which are new) observed in the 35-50({Dirac_h}/2{pi}) spin range. In {sup 158}Dy, three bands have been extended to 42{sup +}(44{sup +}),40{sup -}, and 41{sup -}(43{sup -}), whereas in {sup 159}Dy the yrast band is observed to (81/2){sup +}((85/2){sup +}). The high-spin behavior and band crossing systematics of the Dy isotopes and of the neighboring N = 91, 92, and 93 isotones are discussed in terms of rotational alignments and shape transitions. Cranked Nilsson-Strutinsky calculations without pairing have been performed for detailed comparisons with the very high-spin states observed in {sup 157}Dy.

• OSTI ID: 20771084
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPARATIVE EVALUATIONS
CRANKING MODEL
DYSPROSIUM 157
DYSPROSIUM 158
DYSPROSIUM 159
EXCITATION
GAMMA SPECTRA
GAMMA SPECTROSCOPY
HIGH SPIN STATES
ISOTONIC NUCLEI
NUCLEAR STRUCTURE
ROTATIONAL STATES
SHELL MODELS
SPIN
YRAST STATES