Onset of isomers inand weakened neutron-neutron interaction strength
- 29 October 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 76 (4), 044324
- https://doi.org/10.1103/physrevc.76.044324
Abstract
The presence of isomeric levels with half-lives in the microsecond range has been identified in . Neutron-rich Cd isotopes were produced from the fragmentation of a 120 MeV/nucleon beam and uniquely identified through their time-of-flight, energy loss, and total kinetic energy. γ rays from these isomeric levels were measured with an array of Ge detectors that were gated for 15 μs by a particle implantation trigger from a stack of Si detectors. The γ rays observed in the decay of isomers populate low-energy levels previously identified in the β decay of . The γ rays found in the decay of isomers are consistent with expected yrast structures observed in lighter, odd-mass Cd isotopes. The appearance of these isomers at the point where exceeds 1.6 is interpreted as an indication of the onset of a weakened neutron-neutron interaction that has been proposed for , whose also exceeds 1.6.
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