Abstract
Background: Clustering phenomena in nuclei provide an opportunity to understand the interplay between cluster and nucleon degrees of freedom.
Purpose: To study resonances in the spectrum, populated in elastic scattering.
Method: The thick target inverse kinematics technique was used to measure the excitation function for the elastic scattering. A 42-MeV beam was used to populate states of excitation energy up to 14.9 MeV in . The analysis was performed using a multilevel, multichannel -matrix approach.
Results: Detailed spectroscopic information, including spin parities, partial - and neutron-decay widths and dimensionless reduced widths, was obtained for excited states in between 8 and 14.9 MeV in excitation energy. Cluster-nucleon configuration interaction model calculations of the same quantities are performed and compared to the experimental results.
Conclusions: Strong fragmentation of large -cluster strengths is observed in the spectrum of , making the -cluster structure of quite different from the pattern of known quasirotational bands of alternating parity that are characteristic of , even-even nuclei like and .
6 More- Received 2 June 2014
- Revised 24 July 2014
DOI:https://doi.org/10.1103/PhysRevC.90.024327
©2014 American Physical Society