Decay pattern of the Pygmy Dipole Resonance in130Te

J Isaak ,M Krtička,J Silva,B Löher,C Romig ,N Pietralla ,A P Tonchev ,J Beller ,M Scheck ,D Savran ,Enrico Fiori ,H R Weller ,G Rusev ,K Sonnabend ,W Tornow ,M Zweidinger

doi:10.1051/epjconf/20146602055

Abstract

The electric dipole strength distribution in 130Te has been investigated using the method of Nuclear Resonance Fluorescence. The experiments were performed at the Darmstadt High Intensity Photon Setup using bremsstrahlung as photon source and at the High Intensity -Ray Source, where quasi-monochromatic and polarized photon beams are provided. Average decay properties of 130Te below the neutron separation energy are determined. Comparing the experimental data to the predictions of the statistical model indicate, that nuclear structure effects play an important role even at sufficiently high excitation energies. Preliminary results will be presented.

Highlights

The isovector electric dipole strength (E1) in atomic nuclei has been investigated intensively in the last decades, especially in the region of the Giant Dipole Resonance (GDR) [1]
For many nuclei additional low-lying E1 strength below and in the vicinity of the particle separation energies have been observed, which is usually denoted as Pygmy Dipole Resonance (PDR) [2]
The properties of the PDR have been mostly studied in closed-shell nuclei, e.g. in the Z=50 and N=82 mass region [2]

Summary

Introduction

The isovector electric dipole strength (E1) in atomic nuclei has been investigated intensively in the last decades, especially in the region of the Giant Dipole Resonance (GDR) [1]. For many nuclei additional low-lying E1 strength below and in the vicinity of the particle separation energies have been observed, which is usually denoted as Pygmy Dipole Resonance (PDR) [2]. The properties of the PDR have been mostly studied in closed-shell nuclei, e.g. in the Z=50 and N=82 mass region [2].

Experiments and preliminary results

By measuring the asymmetry