The extent of particle-photon mixing in and has been determined using the and reactions. bands were identified at 593 and 1477 keV in . Since the only neutron two quasiparticle configuration expected below 2 MeV in is , the second band is considered to be predominantly of phonon character. In a band at 145 keV, known from decay scheme studies, receives a measurable population in the () reaction. The phonon admixture in the state which results from the configuration was determined to be (29±5)%. The collective admixture in the state was also calculated from an octupole particle-hole interaction and was found to be 35%, in good agreement with the experimental value. The anomalously low energy of the state could not be entirely reproduced by this calculation.
NUCLEAR REACTIONS , MeV; , MeV; measured . , deduced levels, , , extracted phonon contributions. Enriched target. Calculated particle-phonon mixing.
- Received 14 May 1975
- Published in the issue dated August 1975
© 1975 The American Physical Society