Transition strengths and deformation in sup 77 Kr

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.2418· OSTI ID:6150224

Johnson, T D; Holcomb, J W; Womble, P C; Cottle, P D; Tabor, S L ^[1]; Durham, F E; Buccino, S G ^[2]; Matsuzaki, M ^[3]

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1. Department of Physics, Florida State University, Tallahassee, FL (USA)
2. Department of Physics, Tulane University, New Orleans, Louisiana (USA)
3. Institute of Physics, University of Tsukuba, Ibaraki (Japan)

High spin states in {sup 77}Kr were populated using the {sup 48}Ti({sup 32}S,2{ital pn}){sup 77}Kr reaction with a 106 MeV {sup 32}S beam from the Florida State University Tandem-LINAC accelerator. Three Compton-suppressed Ge detectors at 95{degree} and one at 18{degree} were used to determine {gamma}-{gamma} coincidence relations, directional correlation ratios and Doppler-shift attenuation lifetimes. The level scheme for the positive-parity band agrees with previous studies up to spin 37/2{sup +}. New levels at 9913 keV (41/2{sup +}) and 11 760 keV (45/2{sup +}) have been identified. The negative-parity band was extended to a probable spin state of 27/2{sup {minus}}, with three new levels identified. The kinematic and dynamic moments of inertia in the positive-parity band converge to a rather constant value of (22--24) {h bar}{sup 2}/MeV. The transition quadrupole moments average about 2.6 {ital e} b in this band and decrease somewhat after the {pi}{ital g}{sub 9/2} alignment. The magnetic transition strengths alternate with signature and increase to about a nuclear magneton after the alignment. The kinematic moment of inertia in the negative-parity band increases with rotational frequency and exhibits the beginnings of a band crossing at {h bar}{omega}{approx}0.55 MeV, while the transition quadrupole moments decrease steadily with frequency. Cranking model calculations with the Nilsson plus BCS potential were performed for the quasiparticle energies and electromagnetic transition rates for both the positive- and negative-parity bands. The experimental data were reproduced well. As for the positive-parity band, {beta}(3qp){gt}{beta}(1qp) has been shown to be necessary in addition to {gamma}(3qp){gt}0 to reproduce the signature dependence of the energies and {ital B}({ital M}1) values.

• OSTI ID: 6150224
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 42:6; ISSN 0556-2813
• Country of Publication: United States
• Language: English

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HADRONS
HEAVY ION REACTIONS
HOURS LIVING RADIOISOTOPES
INFORMATION
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MATHEMATICAL MODELS
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NUCLEAR MODELS
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