First g(2+) measurement on neutron-rich 72Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

E. Fiori (1) , G. Georgiev (1) , A.E. Stuchbery , A. Jungclaus , D.L. Balabanski , A. Blazhev , S. Cabaret (2) , E. Clément (3) , M. Danchev , J.M. Daugas , S. Grévy (3) , M. Hass , V. Kumar , J. Leske , Radomira Lozeva (1) , S. Lukyanov , T.J. Mertzimekis , V. Modamio , B. Mouginot (4) , F. Nowacki (5) , Yu. E. Penionzhkevich , L. Perrot (6) , N. Pietralla , K. Sieja (5) , K.-H. Speidel , I. Stefan (4) , C. Stodel (3) , J.C. Thomas (3) , J. Walker , K.O. Zell

1 CSNSM SNO
2 CSNSM MECA
3 GANIL - Grand Accélérateur National d'Ions Lourds
4 IPNO - Institut de Physique Nucléaire d'Orsay
5 IPHC - Institut Pluridisciplinaire Hubert Curien
6 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

The high-velocity transient-field (HVTF) technique was used to measure the g factor of the 2+ state of 72Zn produced as a radioactive beam. The transient-field strength was probed at high velocity in ferromagnetic iron and gadolinium hosts using 76Ge beams. The potential of the HVTF method is demonstrated and the difficulties that need to be overcome for a reliable use of the TF technique with high-Z, high-velocity radioactive beams are revealed. The polarization of K-shell vacancies at high velocity, which shows more than an order of magnitude difference betweenZ = 20 andZ = 30 is discussed. The g-factor measurement hints at the theoretically predicted transition in the structure of the Zn isotopes near N = 40.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

E. Fiori, G. Georgiev, A.E. Stuchbery, A. Jungclaus, D.L. Balabanski, et al.. First g(2+) measurement on neutron-rich 72Zn, and the high-velocity transient field technique for radioactive heavy-ion beams. Physical Review C, 2012, 85, pp.034334. ⟨10.1103/PhysRevC.85.034334⟩. ⟨in2p3-00684457⟩