Abstract
The low-lying levels of 124Sn have been explored using the (n, n′ γ) reaction to identify multiphonon quadrupole excitations. Yields of γ rays as a function of incident neutron energy, γ-γ coincidences, and γ-ray angular distributions have been measured. From the excitation functions and coincidence measurements, the level and decay schemes were determined with good confidence in the γ-ray placements. The angular distributions provide multipolarity information on the decay γ rays which lead to spin assignments for levels and also enable the determination of lifetimes or lifetime limits from Doppler shifts. A close-lying triplet of levels, representing the two-phonon multiplet, occurs near an additional 4+ level which mixes with the 4+ two-phonon excitation. A three-phonon quintet of levels has been found, including one new level, which decays almost exclusively to the two-phonon triplet. No other levels in the three-phonon energy region decay other than weakly to the two-phonon excitations; only one other level has observab le decays to the two-phonon triplet.
Original language | English |
---|---|
Pages (from-to) | 206-226 |
Number of pages | 21 |
Journal | Nuclear Physics A |
Volume | 747 |
Issue number | 2-4 |
DOIs | |
State | Published - Jan 24 2005 |
Bibliographical note
Funding Information:The authors acknowledge the expert assistance of H.E. Baber, our accelerator engineer, who assured that we had excellent accelerator performance throughout the experiments. This work was partially supported under NSF Grant PHY-0098813.
ASJC Scopus subject areas
- Nuclear and High Energy Physics