Systematics of e1 Two-Phonon Excitations around Shell Closures from Nuclear Resonance Fluorescence Experiments

Details Systematics of e1 Two-Phonon Excitations around Shell Closures from Nuclear Resonance Fluorescence Experiments Systematics of e1 Two-Phonon Excitations around Shell Closures from Nuclear Resonance Fluorescence Experiments

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..185p&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Physics

Scientific paper

The nuclear resonance fluorescence method (NRF) is an ideal tool for the investigation of dipole excitations in nuclei because of the spin-selective excitation mechanism and the model-independent data analysis. This report focuses on the systematic study of E1-two-phonon excitations of the quadrupole-octupole-coupled type in nuclei around magic proton and/or neutron numbers. The experimental data from NRF experiments show enhanced E1 strengths, which are more than an order of magnitude higher than usual B(E1) values between low-lying states. The excitation energy of the 1- states is very close to the sum energy of the one-phonon excitations, indicating a nearly harmonic coupling. The systematics of the ground-state transition strengths shows that the B(E1) values are highest for closed-shell nuclei and decrease going away from the magic numbers. This is an experimental evidence for the so-called Dipole Core Polarization (DCP) effect. The second observation that the decay branching to the first 2+ state is weak for magic nuclei and increases going away from the shell closure can also be explained by theoretical calculations.

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