Multiphonon states in {sub 56}{sup 136}Ba{sub 80}

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

DOI:https://doi.org/10.1103/PHYSREVC.78.034317· OSTI ID:21192199

Mukhopadhyay, S; Scheck, M; Crider, B; Choudry, S N; Elhami, E; McEllistrem, M T; Orce, J N ^[1]; Peters, E ^[2]; Yates, S W ^[1]

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1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)
2. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

Low-lying multiphonon states in {sup 136}Ba have been populated with the inelastic neutron scattering reaction. Excitation functions were performed at neutron energies from 2.2 to 3.9 MeV, and {gamma}-ray angular distributions were measured at 2.5, 3.0, and 3.5 MeV. Lifetimes have been determined using the Doppler-shift attenuation method, and electromagnetic transition rates have been deduced. The previously assigned 2{sub 1,ms}{sup +} mixed-symmetry state at 2128.9 keV has been confirmed and is not greatly fragmented. For the first time in the N=80 isotones, a 3{sub 2,ms}{sup +} two-phonon mixed-symmetry state is proposed. In addition, the 2{sub 5}{sup +} and the 4{sub 3}{sup +} levels at 2222.7 and 2356.4 keV, respectively, decay with large B(M1) values to the two-phonon 2{sub 2}{sup +} and 4{sub 1}{sup +} states, respectively, which suggests two-phonon mixed-symmetric character. Their excitation energies, however, are not consistent with this interpretation.

• OSTI ID: 21192199
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARIUM 136
DECAY
DSA METHOD
EXCITATION
EXCITATION FUNCTIONS
GAMMA RADIATION
INELASTIC SCATTERING
ISOTONIC NUCLEI
KEV RANGE
LIFETIME
MEV RANGE
NEUTRON DIFFRACTION
NEUTRON REACTIONS
NEUTRONS
PHONONS
SYMMETRY