Lifetimes of high-spin states in the {pi}i{sub 13/2} band of {sup 173}Re

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.652· OSTI ID:488766

Johnson, N R; Wells, J C; Akovali, Y; Baktash, C; Brinkman, M J; Cullen, D M; Gross, C J; Jin, H; McGowan, F K; Milner, W T; Yu, C ^[1]; Johnson, N R ^[2]; Wells, J C ^[3]; Bengtsson, R ^[4]; Gross, C J ^[5]; Lee, I

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831 (United States)
3. Tennessee Technological University, Cookeville, Tennessee 38505 (United States)
4. Lund Institute of Technology, Lund (Sweden)
5. ORISE, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830 (United States)

Lifetime measurements on the i{sub 13/2} band built on the proton configuration 1/2{sup +}[660] in {sup 173}Re have been carried out by the Doppler-broadened line shape method with the use of the GAMMASPHERE array in an early-implementation arrangement. Lifetimes of the stretched E2 transitions from states of spin 41/2{sup +}{endash}69/2{sup +} in this band were measured, and the transition quadrupole moments calculated from these lifetimes are consistent (average Q{sub t}=8.1{plus_minus}0.5eb) with a large and near-constant deformation ({beta}{sub 2}{approx}0.29) over the frequency range of {h_bar}{omega}=0.29{endash}0.47 MeV. This result attests to the strong deformation-driving effect of the intruder {pi}i{sub 13/2} orbital when it lies just above the Fermi surface. From thin-target measurements, it was possible to add three new levels to this band and to determine that the experimental aligned angular momenta gradually evolve over a large frequency range and level off with a total gain characteristic of alignment by i{sub 13/2} neutrons. Calculations carried out for diabatic configurations give a satisfactory accounting of the alignment gain. However, because of the large interaction between crossing bands, a more meaningful description of the deformation pattern in this band was achieved through calculations of the spin-adiabatic type. Both calculations are discussed and compared with the experimental results. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-96OR22464; FG05-87ER40361
• OSTI ID: 488766
• Journal Information: Physical Review, C, Vol. 55, Issue 2; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
RHENIUM 173
HIGH SPIN STATES
LIFETIME
DEFORMED NUCLEI
DOPPLER BROADENING
SHAPE
E2-TRANSITIONS
QUADRUPOLE MOMENTS
DEFORMATION
ANGULAR MOMENTUM
ALIGNMENT
NEUTRONS