Abstract
Background: Collectivity has been inferred in based on measurements of the excitation energy of the first excited state and value. However, the energy of the state in is not precisely known.
Purpose: The objective was to precisely determine the energy of the transition in following the decay of .
Method: ions were produced by projectile fragmentation at the National Superconducting Cyclotron Laboratory and stopped in a double-sided Si strip detector. isomeric and -delayed rays were detected in an ancillary array of high-purity Ge detectors in order to determine the energies of excited states in and .
Results: The first excited state in was populated following the decay of , and an energy of 430(2) keV was determined. Additionally, an isomeric state in with an energy of 81.0(7) keV and a half-life less than 1 s was discovered.
Conclusion: The excitation energy of the state in has been precisely determined and an isomeric state is identified in for the first time.
- Received 26 February 2014
- Revised 21 May 2014
DOI:https://doi.org/10.1103/PhysRevC.89.067303
©2014 American Physical Society