High-resolution study of the113Cd(n,γ) spectrum by statistical decay model with discrete levels and transitions

Tamás Belgya,Ronald Schwengner,Arnd R Junghans,Eckart Grosse,László Szentmiklósi,Ralph Massarczyk,A Plompen,P Siegler,P Schillebeeckx,S Kopecky,F.-J Hambsch,J Heyse,S Oberstedt,W Mondelaers

doi:10.1051/epjconf/201714605009

Tamás Belgya, Ronald Schwengner + Show 12 more

Open Access

https://doi.org/10.1051/epjconf/201714605009

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Abstract

The gamma-ray spectrum and the decay scheme of 114 Cd obtained from a radiative neutron capture experiment on 113 Cd samples are modelled in the framework of extreme statistical model. The unfolding of the experimental spectrum with proper normalization yields a total capture cross section of 21640 b and an average gamma-ray multiplicity of 4.1. Using the extreme statistical model the development of the low energy decay scheme of 114 Cd is in progress. In the model the constant-temperature level density is used, where the temperature parameter was very sensitive to the shape of the modelled gamma-ray spectrum. Using this sensitivity T = 0.62 MeV was obtained with the constraint of good description of low energy level density and the level density at the binding energy. This is in full agreement with our earlier publication. For the description of the continuum shape of the unfolded spectrum the inclusion of low energy enhancement for the photon strength function was an important new addition.

Highlights

A new statistical decay code has been developed to study (n,γ ) spectra in details
Our first case study is the detailed analysis of the 113Cd(n,γ ) spectrum which has been measured at the Budapest PGAA facility
The parallel description of the 114Cd decay scheme and the gamma-ray spectrum is performed in an iterative way by improving the decay scheme, adjusting the level density and photonstrength functions (PSF) parameters

Summary

Introduction

A new statistical decay code has been developed to study (n,γ ) spectra in details. Our first case study is the detailed analysis of the 113Cd(n,γ ) spectrum which has been measured at the Budapest PGAA facility. The goal is to understand whether this model can be used to improve the low-energy decay scheme and simultaneously maintain a good description of the discrete and continuum part of the spectrum of this important nucleus. Another goal of this study is to push the description to the extremes in the number of critical level energies. With the help of this approach, the radiative neutron capture decay-scheme of 114Cd is extended and improved up to 3.25-MeV critical energy, using a combination of the extreme statistical-decay model and consideration of discrete primary transitions directly fed the levels below the critical energy from the capture state. In this article the current status of this ongoing work is presented

Experimental methods

Data analysis

Results

Summaries