Low-energy magnetic dipole response in 56Fe from high-resolution electron scattering

Fearick, R W; Hartung, G; Langanke, K; Martínez-Pinedo, G; Von Neumann-Cosel, P; Richter, A

Low-energy magnetic dipole response in 56Fe from high-resolution electron scattering

Journal Article

2003

Journal Title

Nuclear Physics A

Link to Journal

http://www.journals.elsevier.com/nuclear-physics-a/

Publisher

University of Cape Town

Department

Department of Physics

Faculty

Faculty of Science

Abstract

The 56Fe(e, e ) reaction has been studied for excitation energies up to about 8 MeV and momentum transfers q 0.4–0.55 fm−1 at the Darmstadt electron linear accelerator (DALINAC) with kinematics emphasizing M1 transitions. Additional data have been taken for q 0.8– 1.7 fm−1 at the electron accelerator NIKHEF, Amsterdam. A PWBA analysis allows spin and parity determination of the excited states. For M1 excitations, transition strengths are derived with a DWBA analysis using shell-model form factors. The resulting B(M1) strength distribution is compared to shell-model calculations employing different effective interactions. The form factor of the prominent low-lying M1 transition at 3.449 MeV demonstrates its dominant orbital nature. It represents a major part of the scissors mode in 56Fe.