Berlin 2005 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 3: Kernphysik/Spektroskopie
HK 3.5: Talk
Friday, March 4, 2005, 15:15–15:30, TU MA004
Structure of the 21+ state in radioactive 68Ge from g factor and lifetime measurements+ — •J. Leske1, K.-H. Speidel1, S. Schielke1, O. Kenn1, J. Gerber2, P. Maier-Komor3, S.J.Q. Robinson4, Y.Y. Sharon5, and L. Zamick5 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Univ. Bonn, Germany — 2Institut de Recherches Subatomiques, Strasbourg, France — 3Physik-Dept. TU München, Garching, Germany — 4Univ. of Southern Indiana, Evansville, Indiana, USA — 5Rutgers Univ., Piscataway, NJ, USA
The g factor of the 21+ state of radioactive 68Ge (T1/2 = 270 d) has been measured for the first time. The technique used is based on α transfer from a 12C target to 180 MeV 64Zn projectiles that incorporates the favourable conditions of inverse kinematics as in projectile Coulomb excitation. It also includes the good features of the transient field technique applied to the nuclear spin precessions. In addition, we have remeasured the lifetimes of several excited states using the Doppler-Shift-Attenuation method. All measurements were carried out at the Munich tandem accelerator. The g factor value obtained, g(21+) = +0.55(14), is in good agreement with the collective value, g = Z/A = +0.47, and is also consistent with the precise data of the stable even-A Ge isotopes. The deduced B(E2) values and the g factor have been interpreted in the framework of the spherical shell model assuming a closed 56Ni core and neutron and proton orbitals in the fp shell model space. Among the various effective interactions used the FPD6 interaction without A–scaling yielded surprisingly the best overall agreement with the experimental data.
[+] supported by the BMBF