Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Struktur und Dynamik von Kernen
HK 41.1: Gruppenbericht
Dienstag, 5. März 2013, 16:45–17:15, HSZ-301
Pygmy Dipole Strength in 86Kr and Systematics of N=50 Isotones — •R. Schwengner1, R. Massarczyk1,2, G. Rusev3, N. Tsoneva4, D. Bemmerer1, R. Beyer1, R. Hannaske1,2, A.R. Junghans1, J.H. Kelley3, E. Kwan3, H. Lenske4, M. Marta1, R. Raut3, K.D. Schilling1, A. Tonchev3, W. Tornow3, and A. Wagner1 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR) — 2TU Dresden — 3Triangle Universities Nuclear Laboratory (TUNL), Durham NC, USA — 4Universität Gießen
We present results of the first photon-scattering study of 86Kr. Experiments were carried out with bremsstrahlung at the ELBE accelerator of HZDR and with monoenergetic, polarized γ rays at the HIγS facility of TUNL. A high-pressure gas target was used. We identified about 40 states with Jπ= 1− up to the neutron-separation energy for the first time. For the determination of the absorption cross section, strength in the quasicontinuum was taken into account and a correction of the cross section for inelastic transitions was performed on the basis of simulations of statistical γ-ray cascades. The resulting absorption cross section shows enhanced strength considered as a pygmy dipole resonance (PDR) and is compared with predictions of the quasiparticle-phonon model. The behavior of PDR strength within the series of N = 50 isotones is discussed. Enhanced photon strength may influence neutron-capture reaction rates relevant for transmutation studies.
This work is supported by the DFG under contract SCHW 883/1-1.