Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Struktur und Dynamik von Kernen IX

HK 57.4: Vortrag

Donnerstag, 24. März 2011, 17:15–17:30, O-1

First g-factor measurement on radioactive ⁸⁸Zr(2₁⁺) near the N=50 shell closure^* — •K.-H. Speidel¹, G.J. Kumbartzki², N. Benczer-Koller², D.A. Torres², G. Gürdal², Y.Y Sharon², T. Ahn³, V. Anagnostatou³, Ch. Bernards³, M. Elvers³, P. Goddard³, G. Ilie³, D. Radeck³, D. Savran³, V. Werner³, J. Ashenfelder³, F. Lopez³, C. Miller³, and P. Maier-Komor⁴ — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Uni Bonn — ²Rutgers University, New Brunswick NJ — ³Yale University, New Haven CT — ⁴Physik-Department, TU München

The Zr nuclei at and near shell closures in protons (Z=40) and neutrons (N=50) play a very important role for nuclear structure studies. For the radioactive ⁸⁸Zr the two neutron holes in the g_9/2 orbital should show a distinct fingerprint in the nuclear wave function of the 2₁⁺ state which can be observed by its g-factor. The α-transfer from a carbon target to ⁸⁴Sr projectiles of 278 MeV has been used to populate the 2₁⁺ state in ⁸⁸Zr via the reaction ¹²C(⁸⁴Sr, ⁸Be)⁸⁸Zr. The ⁸⁴Sr beam was provided by the Yale tandem accelerator using highly enriched ⁸⁴Sr in the form of SrH₃ ions emerging from the ion source. The two α-particles from the breakup of ⁸Be and the recoiling carbon ions from projectile Coulomb excitation were detected in a Si detector at 0^∘ in coincidence with γ-rays recorded in four Ge Clover detectors. Spin precessions have been measured simultaneously for ⁸⁸Zr and ⁸⁴Sr nuclei employing the transient field technique. The g-factors obtained for the 2₁⁺ states are discussed in the context of similar data for neighbouring isotopes around the N=50 shell closure. ^*supported by the DFG