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

Vermeulen, Nele; Chamoli, SK; Daugas, JM; Hass, M; Balabanski, DL; Delaroche, JP; de Oliveira-Santos, F; Georgiev, G; Girod, M; Goldring, G; Goutte, H; Grevy, S; Matea, I; Morel, P; Singh, BS Nara; Penionzkevich, Yu-E; Perrot, L; Perru, O; Peru, S; Roig, O; Sarazin, F; Simpson, GS; Sobolev, Yu; Stefan, I; Stodel, C; Yordanov, DT; Neyens, Gerda

doi:10.1103/PhysRevC.75.051302

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

Author:

Vermeulen, Nele

Chamoli, SK ; Daugas, JM ; Hass, M ; Balabanski, DL ; Delaroche, JP ; de Oliveira-Santos, F ; Georgiev, G ; Girod, M ; Goldring, G ; Goutte, H ; Grevy, S ; Matea, I ; Morel, P ; Singh, BS Nara ; Penionzkevich, Yu-E ; Perrot, L ; Perru, O ; Peru, S ; Roig, O ; Sarazin, F ; Simpson, GS ; Sobolev, Yu ; Stefan, I ; Stodel, C ; Yordanov, DT ; Neyens, Gerda

Keywords:

61Fe 9/2+ isomer, fusion-evaporation reactions, isomer g-factor, yrast decay schemes, projectile fragmentation, exotic nuclei, TDPAD, heavy-ion, neutron, polarization, deformation, nuclides, isotopes, fe-57, Science & Technology, Physical Sciences, Physics, Nuclear, Physics, YRAST DECAY SCHEMES, NEUTRON, POLARIZATION, DEFORMATION, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich Fe-61(9/2(+)) [E-*= 861 keV, T-1/2= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a Ni-64 beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment Q(s)=41(6) e fm(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(0)=-85 e fm(2) or Q(0)=+115 e fm(2). The present measurement paves the way for future determinations of isomeric quadrupole moments in more exotic nuclei.