First isomeric quadrupole moment measured in fragmentation reactions: the case of Fe-61(m)(9/2(+))

N. Vermeulen, S.K. Chamoli, J.M. Daugas, M. Hass, D.L. Balabanski, J.P. Delaroche, F. de Oliveira-Santos, G. Georgiev, M. Girod, G. Goldring, H. Goutte, S. Grevy, I. Matea, P. Morel, B.S. Nara Singh, Yu.-E. Penionzkevich, L. Perrot, O. Perru, S. Peru, O. RoigF. Sarazin, G.S. Simpson, Yu. Sobolev, I. Stefan, C. Stodel, D.T. Yordanov, G. Neyens

Research output: Contribution to journalArticlepeer-review


This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich 61Fe(9/2+) [E∗= 861 keV, T1/2= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a 64Ni beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment
∣∣Qs∣∣=41(6)efm2agrees 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.
Original languageEnglish
Article number051302(R)
JournalPhysical Review C
Issue number5
Publication statusPublished - 14 May 2007
Externally publishedYes


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