Low-energy enhancement of M1 strength

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Schwengner, R.^1 ; Frauendorf, S.^2 ; Larsen, A.C.^3

Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden

01328, Germany^1

Department of Physics, University of Notre Dame, Notre Dame

IN

46556, United States^2

Department of Physics, University of Oslo, Oslo

0316, Norway^3

关键词: Low transition;    Low-energy;    Magnetic dipole;    Shell models;    Strength function;    Transition strengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012020/pdf
DOI  :  10.1088/1742-6596/580/1/012020

来源: IOP

【 摘 要 】

Magnetic dipole strength functions have been deduced from averages of a large number of M1 transition strengths calculated within the shell model for the nuclides90Zr,94Mo,95Mo, and96Mo. 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.