Two-quasiparticle isomer, E1 hindrances and residual interactions in {sup 172}Tm

Journal Article · Tue Apr 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.044309· OSTI ID:21189906

Hughes, R O; Lane, G J; Dracoulis, G D; Kibedi, T; Nieminen, P; Watanabe, H ^[1]

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1. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, A. C. T. 0200 (Australia)

The structure of the neutron-rich nucleus {sup 172}Tm has been studied using incomplete fusion of {sup 7}Li on an {sup 170}Er target at 30 MeV. A 190-{mu}s isomer at an excitation energy of 476 keV was identified using chopped beams and {gamma}-ray spectroscopy. The isomer decays with very inhibited E1 transitions to the rotational bands based on the parallel and antiparallel couplings of the {nu}5/2{sup -}[512] x {pi}1/2{sup +}[411] configuration, the latter (K{sup {pi}}=2{sup -}) being the ground state. The isomeric state has been assigned J{sup {pi}}=6{sup +}, arising from the energetically favored (parallel) coupling of the {nu}5/2{sup -}[512] x {pi}7/2{sup -}[523] configuration. The proton-neutron residual interaction was deduced for the configuration of the isomeric state and is found to agree with previous empirical studies.

• OSTI ID: 21189906
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CONFIGURATION
COUPLING
DECAY
E1-TRANSITIONS
ERBIUM 170 TARGET
EXCITATION
GAMMA SPECTROSCOPY
GROUND STATES
ISOMERS
KEV RANGE 100-1000
LITHIUM 7
MEV RANGE 10-100
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR STRUCTURE
PROTONS
RESIDUAL INTERACTIONS
ROTATIONAL STATES
THULIUM 172