Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.9: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

New g factor measurement of the ⁴⁴Ca(2₁⁺) state ⁺ — •S. Schielke¹, K.-H. Speidel¹, O. Kenn¹, J. Leske¹, G. Müller¹, and J. Gerber² — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — ²Institut de Recherches Subatomiques, F-67037 Strasbourg, France

In view of the precise g(2₁⁺) values obtained for Ti and Cr isotopes [1] suggesting considerable excitations of protons and neutrons of the ⁴⁰Ca core to fp shell orbits the first 2⁺ states of Ca isotopes should show a similar behaviour. However, from an early measurement on ⁴⁴Ca [2] the g(2₁⁺) value was found to be negative indicating a dominant f_7/2 neutron component in the wave function. We have remeasured this g factor by employing projectile Coulomb excitation in inverse kinematics combined with the transient field technique. A ⁴⁴Ca beam provided by the Cologne tandem accelerator was Coulomb excited by scattering from a carbon target. The g factor was derived from spin precessions in ferromagnetic Gd. Contrary to [2] the newly determined g factor is definitely positive indicating collective admixtures due to core excitation.

+ supported by DFG

[1] R. Ernst et al., Phys. Rev. Lett. 84 (2000) 416

[2] Y. Niv et al., Phys. Rev. Lett. 43 (1979) 326