Levels of {sup 187}Au: A detailed study of shape coexistence in an odd-mass nucleus

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.771· OSTI ID:639186

Rupnik, D; Zganjar, E F ^[1]; Wood, J L ^[2]; Semmes, P B ^[3]; Mantica, P F ^[4]

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1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
2. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
3. Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505 (United States)
4. UNISOR, Oak Ridge Institute of Science and Education, Oak Ridge, Tennessee 37831 (United States)

The decays of {sup 187}Hg (2.2 min; J{sup {pi}}=13/2{sup +}) and {sup 187}Hg (2.4 min; J{sup {pi}}=3/2{sup {minus}}) have been studied with mass-separated sources at the UNISOR facility. Multiscaled spectra of {gamma} rays, x rays, and conversion electrons, as well as {gamma}{gamma}t, {gamma}xt, e{gamma}t, and ext coincidences were obtained. Decay schemes have been constructed incorporating {gt}99{percent} of the decay intensities assigned to the high-spin and low-spin decays. The {gamma}-ray gated conversion-electron spectra permitted determination of 367 conversion coefficients. A variety of coexisting band structures are established in {sup 187}Au. Some of these have near-identical analogs in the heavier odd-mass Au isotopes. The remaining bands reveal new degrees of freedom at low excitation energy in {sup 187}Au. Nine electric monopole (E0) transitions are observed to deexcite members of these new bands. The work represents an undertaking to achieve a benchmark in {ital complete} spectroscopy following radioactive decay. The most notable band structure in {sup 187}Au has two bands with identical spins, nearly identical relative energies, and electric monopole transitions connecting the {ital favored} members. These bands can be understood as {pi}h{sub 9/2} and {pi}f{sub 7/2} intruder configurations coupled to coexisting prolate or near-prolate ({gamma}{le} 20{degree}) cores having diabatic configurations that differ only in the number of protons occupying the N=5 intruder configurations. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 639186
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 58; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DE-EXCITATION
E0-TRANSITIONS
ELECTRONS
ENERGY LEVELS
GOLD 187
INTERNAL CONVERSION
MERCURY 187
NUCLEAR DECAY
SHAPE
SPIN