Abstract
Background: Identification of proton-neutron mixed-symmetric one-quadrupole phonon excitations (the states) of atomic nuclei provides information on the isovector part of the residual nucleon-nucleon interaction. It was predicted that the state of particular nuclei close to the U(5) limit of the interacting boson model, in particular , should be considerably populated by -transfer reactions [C. E. Alonso et al., Phys. Rev. C 78, 017301 (2008)].
Purpose: We aim at the identification of the mixed-symmetry state (MSS) of radioactive and investigate its population by the -transfer reaction as a suitable tool to selectively populate MSSs and as a potential new signature for its mixed-symmetric character.
Method: A -ray spectroscopy experiment was performed in inverse kinematics in order to populate the state of by -transfer from a target on beam ions. The population of the candidate for the state of was measured relative to the population of the state.
Results: The candidate for the state of was populated by transfer three times weaker than predicted. Another state that can be ruled out as the MSS was in turn as strongly populated by the transfer as predicted for the MSS.
Conclusions: The relative population of states by -transfer cannot serve as a new signature for MSSs, since other states are also strongly populated. Nevertheless, the substantial population of the MSS candidate of by transfer qualifies this type of reaction as suitable tool to excite MSSs and study their electromagnetic decay properties.
- Received 11 September 2015
DOI:https://doi.org/10.1103/PhysRevC.92.044324
©2015 American Physical Society