Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 37: Kernphysik/Spektroskopie V
HK 37.2: Vortrag
Donnerstag, 20. März 2003, 14:00–14:15, A
First g factor measurements of the 21+ and 31−states of 96Zr+ — •K.-H. Speidel1, G.J. Kumbartzki2, N. Benczer-Koller2, M.J. Taylor2, and A.E. Stuchbery3 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2Rutgers Univ., New Brunswick, NJ 08903, USA — 3Australian National Univ., Canberra, ACT 0200, Australia
The low energy levels of 90,92,94,96Zr are characterized by rather pure proton and/or neutron configurations in their wavefunctions which has its origin in the Z=40 and N=50 shell closures. This feature has been well established by recent g-factor measurements on the 21+ and 31− states of 90Zr[1] and the 21+ and 41+ states of 92,94Zr isotopes [2]. Corresponding data for 96Zr were now obtained in a new experiment employing the same technique of projectile Coulomb excitation in inverse kinematics. Isotopically pure 96Zr beams of 274 MeV from the Yale tandem accelerator were excited by scattering from a 26Mg as well as a natural carbon target both with Gd layers for precession of the excited 21+ and 31− states. Ge-Clover detectors were used for detecting γ rays in coincidence with target ions registered in a 0∘ Si detector. The strikingly different g factors obtained, g(21+)=+0.03(4) and g(31−)=+0.94(12), are attributed to dominant (d5/2s1/2) neutron and minor (g9/2)2 proton configurations for the 2+ and (p3/2g9/2) protons for the 3− states, respectively. This feature clearly reflects the effect of the d5/2 neutron subshell closure.
+ supported by the DFG
[1] G. Jakob et al., Phys. Lett. B 494, 187 (2000)
[2] G. Jakob et al., Phys. Lett. B 468, 13 (1999)