Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Kernphysik / Spektroskopie

HK 12.8: Talk

Tuesday, March 13, 2007, 16:00–16:15, D

Magnetic Quadrupole Modes in Selfconjugate sd-Shell Nuclei from Electron Scattering at 180^∘ — •Maksym Chernykh¹, Natalya Goncharova², Peter von Neumann-Cosel¹, Natalya Pronkina², and Achim Richter¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt, Germany — ²Institute of Nuclear Physics, Moscow State University, Russia

Magnetic quadrupole modes in the selfconjugate nuclei ²⁴Mg, ²⁸Si and ³²S have been studied in 180^∘ electron scattering at the S-DALINAC. The experimental form factors and B(M2) strength distributions are compared to particle-core shell-model calculations which provide a satisfactory description of the experimentally observed fragmentation. The role of orbital contributions (the so-called "twist mode") and of a quenching of the spin response are investigated.