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First isomeric quadrupole moment measured in fragmentation reactions: The case of Fe61m(9/2+)

N. Vermeulen et al.
Phys. Rev. C 75, 051302(R) – Published 14 May 2007

Abstract

This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich Fe61(9/2+) [E*= 861 keV, T1/2= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a Ni64 beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment |Qs|=41(6)efm2 agrees with mean-field based calculations using the finite-range Gogny force, suggesting a moderately deformed shape characterized by an intrinsic charge quadrupole moment Q0=85efm2 or Q0=+115efm2. The present measurement paves the way for future determinations of isomeric quadrupole moments in more exotic nuclei.

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  • Received 27 October 2006

DOI:https://doi.org/10.1103/PhysRevC.75.051302

©2007 American Physical Society

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Vol. 75, Iss. 5 — May 2007

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