Precision Lifetime Measurements of Excited States in 38Si
Abstract
The nuclear shell structure significantly evolves in the neutron-rich region at the traditional magic numbers N=20 and 28, resulting in rapid shape transitions as predicted by shell model calculations. The energy ratios between the first 2+ and 4+ states in the even-even Si isotopes from N=20 to 28 suggest a variety of collectivity evolving from vibrational, to possible triaxial, to rotational modes. The systematic behavior of the level schemes along the Si isotopic chain suggests 38Si as the turning point in this transition. The lifetime measurement of 38Si was performed at the National Superconducting Cyclotron Laboratory based on the Recoil-Distance Method using the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA). The data are used to extract the B(E2) ratio which provides a useful measurement to assess the nature of collective modes.
This material is based upon work supported by the Department of Energy National Nuclear Security Administration through the Nuclear Science and Security Consortium under Award Number DE-NA0003180.- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DNP.RC005G