First isomeric quadrupole moment measured in fragmentation reactions: The case of {sup 61}Fe{sup m}(9/2{sup +})

Journal Article · Tue May 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.051302· OSTI ID:20995255

Vermeulen, N; Yordanov, D T; Neyens, G ^[1]; Chamoli, S K; Hass, M; Goldring, G; Singh, B S. Nara ^[2]; Daugas, J M; Delaroche, J P; Girod, M; Goutte, H; Morel, P; Perru, O; Peru, S; Roig, O ^[3]; Balabanski, D L ^[4]; Oliveira-Santos, F de; Grevy, S; Perrot, L; Stefan, I ^[5]

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1. Instituut voor Kern-en Stralingsfysica, K. U. Leuven, B-3001 Leuven (Belgium)
2. Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100 (Israel)
3. CEA/DIF/DPTA/PN, BP 12, F-91680 Bruyeres le Chatel (France)
4. Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy)
5. GANIL, BP 55027, F-14076 Caen Cedex 5 (France)

This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich {sup 61}Fe(9/2{sup +}) [E*= 861 keV, T{sub 1/2}= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a {sup 64}Ni beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment |Q{sub s}|=41(6) e fm{sup 2} agrees with mean-field based calculations using the finite-range Gogny force, suggesting a moderately deformed shape characterized by an intrinsic charge quadrupole moment Q{sub 0}=-85 e fm{sup 2} or Q{sub 0}=+115 e fm{sup 2}. The present measurement paves the way for future determinations of isomeric quadrupole moments in more exotic nuclei.

• OSTI ID: 20995255
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELECTRONS
FRAGMENTATION
IRON 61
KEV RANGE 100-1000
MEAN-FIELD THEORY
MONOCRYSTALS
NEUTRONS
NICKEL 64
QUADRUPOLE MOMENTS
S QUARKS
SPIN