title: Giant resonances in the doubly magic nucleus 48Ca from the (e, e'n) reaction.
abstract: The 48Ca(e,e(')n) reaction has been investigated for excitation energies 11-25 MeV and momentum transfers 0.22-0.43 fm(-1) at the superconducting Darmstadt electron linear accelerator S-DALINAC. Electric dipole and quadrupole plus monopole strength distributions are extracted from a multipole decomposition of the spectra. Their fragmented structure is described by microscopic calculations allowing for coupling of the basic particle-hole excitations to more complex configurations. Comparison of the excitation spectrum of the residual nucleus 47Ca with statistical model calculations reveals a 39(5)% contribution of direct decay to the damping of the giant dipole resonance.
authors.affiliation: Institut fur Kernphysik, Technische Universitat Darmstadt, D-64289 Darmstadt, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Strauch
authors.lastname: von Neumann-Cosel P
authors.forename: C
authors.initials: C
authors.lastname: Rangacharyulu
authors.forename: A
authors.initials: A
authors.lastname: Richter
authors.forename: G
authors.initials: G
authors.lastname: Schrieder
authors.forename: K
authors.initials: K
authors.lastname: Schweda
authors.forename: J
authors.initials: J
authors.lastname: Wambach