Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 37: Kernphysik/Spektroskopie V
HK 37.4: Vortrag
Donnerstag, 20. März 2003, 14:30–14:45, A
Lifetime and first g factor measurements of the 21+ state of radioactive N=Z44Ti+ — •S. Schielke1, K.-H. Speidel1, O. Kenn1, J. Leske1, N. Gemein1, M. Offer1, J. Gerber2, P. Maier-Komor3, Y.Y. Sharon4, and L. Zamick4 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2Institut de Recherches Subatomiques, F-67037 Strasbourg, France — 3Technische Universiät München, D-85748 Garching — 4Rutgers University, New Brunswick, NJ 08903, USA
The great interest in the N=Z nuclei lies in the specific feature that protons and neutrons occupy the same orbitals; hence isospin symmetry as well as neutron-proton pairing correlations distinctly contribute to the nuclear structure. 44Ti is such a candidate with 2 protons and 2 neutrons in the f7/2 shell. The g factor of the 21+ state has been measured for the first time and the lifetime was redetermined with much higher precision. In default of a radioactive 44Ti (T1/2= 60 y) beam the state was populated with large cross-section in an α-transfer reaction bombarding a carbon target with a 40Ca beam of 95 MeV provided by the Cologne tandem accelerator. The merit of the inverse kinematics was exploited like in projectile Coulomb excitation, detecting de-excitation γ rays in coincidence with forward emitted 2α particles, from the decay of 8Be, in a 0∘ Si detector. The nuclear precessions occurred in the transient magnetic field of magnetized gadolinium of the composite target. Both the g factor and the B(E2) are well explained by full fp shell model calculations based on a 40Ca core and the FPD6 effective NN interaction.
+ supported by the DFG