Direct proton decay from the Gamow-Teller resonance in {sup 208}Bi

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.604· OSTI ID:112988

Akimune, H; Daito, I; Fujita, Y; Fujiwara, M; Greenfield, M B; Harakeh, M N; Inomata, T; Jaenecke, J; Katori, K; Nakayama, S; Sakai, H; Sakemi, Y; Tanaka, M; Yosoi, M ^[1]

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1. Research Center for Nuclear Physics, Osaka University, Suita, Osaka 567 (Japan)

Spin-isospin excitations in {sup 208}Bi have been investigated using the {sup 208}Pb ({sup 3}He,{ital t}){sup 208}Bi reaction at near {theta}{approx}0{degree} at {ital E}({sup 3}He)=450 MeV. The microscopic structure of the Gamow-Teller resonance (GTR), the isobaric analog state (IAS), and the spin-flip dipole ({Delta}{ital L}=1) resonance (SDR) in {sup 208}Bi has been studied by observing their direct proton decays to the low-lying neutron-hole states in {sup 207}Pb. Decay protons were measured at backward angles in coincidence with tritons detected at and near 0{degree}. The total branching ratio for proton decay from the GTR is determined to be only 4.9{plus_minus}1.3%. The total branching ratio for proton decay from the SDR amounts to 14.1{plus_minus}4.2%. The deduced total widths as well as the total and partial proton escape widths of the GRR and IAS are found to be in reasonable agreement with recent theoretical estimates obtained in the framework of the continuum Tamm-Dancoff approximation.

• OSTI ID: 112988
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
66 PHYSICS
BISMUTH 208
DIPOLES
EXCITATION
GAMOW-TELLER RULES
HELIUM 3 REACTIONS
ISOSPIN
LEAD 208 TARGET
SPIN
SPIN FLIP
TAMM-DANCOFF METHOD