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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Struktur und Dynamik von Kernen
HK 3.1: Gruppenbericht
Montag, 17. März 2014, 14:00–14:30, HZ 4
Low-energy enhancement of M1 strength — •Ronald Schwengner1, Stefan Frauendorf2, and Ann-Cecilie Larsen3 — 1Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden — 2Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA — 3Department of Physics, University of Oslo, 0316 Oslo, Norway
Magnetic dipole strength functions have been deduced from averages of a large number of M1 transition strengths calculated within the shell model for the nuclides 90Zr, 94Mo, 95Mo, and 96Mo. An enhancement of M1 strength toward low transition energy has been found for all nuclides considered. Large M1 strengths appear for transitions between close-lying states with configurations including proton as well as neutron high-j orbits that re-couple their spins and add up their magnetic moments coherently. The M1 strength function deduced from the calculated M1 transition strengths is compatible with the low-energy enhancement found in (3He,3He’) and (d,p) experiments. The present work presents an explanation of the experimental findings.