Multiphonon states in (136)(56)Ba(80)

S. Mukhopadhyay, M. Scheck, B. Crider, S. N. Choudry, E. Elhami, E. Peters, M. T. McEllistrem, J. N. Orce, S. W. Yates

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Abstract

Low-lying multiphonon states in 136Ba have been populated with the inelastic neutron scattering reaction. Excitation functions were performed at neutron energies from 2.2 to 3.9 MeV, and γ-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+1,ms 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+2, ms two-phonon mixed-symmetry state is proposed. In addition, the 2+5
and the 4+3 levels at 2222.7 and 2356.4 keV, respectively, decay with large B(M1) values to the two-phonon 2+2 and 4+1 states, respectively, which suggests two-phonon mixed-symmetric character. Their excitation energies, however, are not consistent with this interpretation.
Original languageEnglish
Article number034317
JournalPhysical Review C
Volume78
Issue number3
DOIs
Publication statusPublished - Sep 2008
Externally publishedYes

Cite this

Mukhopadhyay, S., Scheck, M., Crider, B., Choudry, S. N., Elhami, E., Peters, E., ... Yates, S. W. (2008). Multiphonon states in (136)(56)Ba(80). Physical Review C, 78(3), [034317]. https://doi.org/10.1103/PhysRevC.78.034317