Role of the direct processes in low-energy deuteron interactions

Marilena Avrigeanu,Vlad Avrigeanu,Cristian Costache

doi:10.1051/epjconf/201714612020

Marilena Avrigeanu, Vlad Avrigeanu + Show 1 more

Open Access

https://doi.org/10.1051/epjconf/201714612020

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Abstract

An extended analysis of the key role of direct interactions, i.e., breakup, stripping and pick-up processes, has been carried out for deuteron-induced reactions. Particular comments concern the deuteron breakup which is the dominant mechanism involved in surrogate reactions on heavy nuclei, around the Coulomb barrier.

Highlights

At present increased deuteron-data needs follow the demands of on-going strategic research programs (ITER, IFMIF, SPIRAL2-NFS [1]) that involve deuteron beams, while the corresponding experimental and evaluated data are less extensive and accurate than for neutrons
Concerning the physical picture of the deuteron breakup in the Coulomb and nuclear fields of the target nucleus, two distinct processes are considered in this respect, namely the elastic breakup (EB) in which the target nucleus remains in its ground state and none of the deuteron constituents interact with it, and the inelastic breakup or breakup fusion (BF), where one of these deuteron constituents interacts nonelastically with the target nucleus
The reactions induced by the BF nucleons lead to different compound nuclei than following the incoming deuterons, the partition of the BF cross section among various residual nuclei being triggered by the energy spectra of the BF nucleons and the excitation functions of the pre-equilibrium (PE) and compoundnucleus (CN) reactions induced by these nucleons on the target nuclei [3,4,5]

Summary

Introduction

At present increased deuteron-data needs follow the demands of on-going strategic research programs (ITER, IFMIF, SPIRAL2-NFS [1]) that involve deuteron beams, while the corresponding experimental and evaluated data are less extensive and accurate than for neutrons. There are currently many efforts to improve the description of deuteron reactions (e.g., [2]) due to the use of (d, pγ ), and (d, p f ) surrogate reactions for neutron capture (n, γ ) and induced fission (n, f ) cross sections investigations respectively, of interest for breeder reactors. The consistent account of the direct interactions (DI) role in deuteron interaction process [3,4,5], i.e., the breakup (BU) and direct reactions (DR) (stripping and pick-up), forms the object of this work for nuclei from 27Al to 238U. While the above-mentioned references include a detailed description of the involved model assumptions and consistent parameters sets that were either established or validated using various independent data, we briefly mention here only the updated main points of these analyzes

Deuteron breakup

Direct reactions

DI effects on surrogate reactions

Findings

Conclusions