Resonances in odd-odd182Ta

C.P Brits,P Papka,M Klintefjord,M Wiedeking,F Giacoppo,M Guttormsen,V W Ingeberg ,K Hadyńska-Klȩk ,E Šahin ,H T Nyhus ,B V Kheswa ,T Renstrøm,S Siem,G M Tveten ,A C Larsen ,F Zeiser,T W Hagen ,D L Bleuel ,S J Rose ,A Görgen,K L Malatji ,F L Bello Garrote

doi:10.1051/epjconf/201714605012

Abstract

Enhanced γ-decay on the tail of the giant electric dipole resonance, such as the scissors or pygmy resonances, can have significant impact on (n,γ) reaction rates. These rates are important input for modeling processes that take place in astrophysical environments and nuclear reactors. Recent results from the University of Oslo indicate the existence of a significant enhancement in the photon strength function for nuclei in the actinide region due to the scissors resonance. Further, the M1 strength distribution of the scissors resonances in rare earth nuclei has been studied extensively over the years. To investigate the evolution and persistence of the scissor resonance in other mass regions, an experiment was performed utilizing the NaI(Tl) γ-ray detector array (CACTUS) and silicon particle telescopes (SiRi) at the University of Oslo Cyclotron laboratory. Particle-γ coincidences from the 181 Ta(d,p) 182 Ta and 181 Ta(d,d') 181 Ta reactions were used to measure the nuclear level density and photon strength function of the well-deformed 181 Ta and 182 Ta systems, to investigate the existence of resonances below the neutron separation energy.

Highlights

The photon strength function (PSF) characterises the average electromagnetic properties of an excited nucleus and it is related to radiative decay and photo-absorption processes
The total PSF can be described by various resonances, such as the giant electric dipole resonance (GEDR)
The PSF and nuclear level density (NLD) are used as input parameters in reaction cross section calculations in the statistical framework of Hauser and Feshback through code like Talys [1], and are relevant to the design of existing and future nuclear power reactors, where simulations depend on the many evaluated nuclear reactions involved [2]

Summary

Introduction

The photon strength function (PSF) characterises the average electromagnetic properties of an excited nucleus and it is related to radiative decay and photo-absorption processes. The PSF and NLD are used as input parameters in reaction cross section calculations in the statistical framework of Hauser and Feshback through code like Talys [1], and are relevant to the design of existing and future nuclear power reactors, where simulations depend on the many evaluated nuclear reactions involved [2]. They play a central role in elemental formation during stellar nucleosynthesis [3]. Calculations have shown that relative small changes to the overall shape of the PSF, can have an order of magnitude effect on the rate of elemental formation [3]

Methods

Results

Conclusion