Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 3: Kernphysik/Spektroskopie

HK 3.6: Vortrag

Freitag, 4. März 2005, 15:30–15:45, TU MA004

First g factor measurements on the 2₁⁺ states in ^36,38Ar and their shell model interpretations⁺ — •S. Schielke¹, K.-H. Speidel¹, J. Leske¹, 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

First measurements of g factors of the 2₁⁺ states in ^36,38Ar have been performed via α transfer reactions in inverse kinematics combined with the technique of transient magnetic fields. In addition, B(E2) values were deduced from newly measured lifetimes using the Doppler-Shift-Attenuation method. These investigations were mainly motivated by the specific features, that for ³⁶Ar with N=Z=18, isospin symmetry effects as well as neutron-proton pairing correlations, and for ³⁸Ar with 20 neutrons, the N=20 shell closure should dominate the nuclear structure. Hence, for these nuclei with the inclusion of similar data for ⁴⁰Ar, appropriate shell model calculations ought to explain subtle alterations of the structure with neutron number. In the measurements, ³²S and ³⁴S beams of the Cologne and Munich tandem accelerators were used as projectiles bombarding a multilayered target with natural carbon for the nuclear reaction. Excellent agreement was achieved between experiment and theory for all Ar isotopes.

[⁺] supported by the DFG