Abstract

Asymptotic Normalization Coefficients method is one of the indirect methods used in nuclear astrophysics. The method allows to deduce a direct part of a radiative capture cross section from the measurement of a two body reaction under specific conditions. The experimental works started in collaboration of NPI CAS, TAMU and INFN LNS from 90-ties and continue till the present. The introduction to this method is presented and experimental experiences from NPI CAS and the collaboration are shared.

Highlights

  • Asymptotic Normalization Coefficients method is one of the indirect methods used in nuclear astrophysics

  • The method allows to deduce a direct part of a radiative capture cross section from the measurement of a two body reaction under specific conditions

  • The experimental works started in collaboration of NPI CAS, TAMU and INFN LNS from 90-ties and continue till the present

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Summary

Introduction

Nuclear reactions at low energies are of a specific interest in astrophysics. Direct measurement of these reactions is difficult and technological development makes it more and more accessible only in the last decades. Indirect methods can provide the information that is currently not possible to obtain directly, and can bring another piece of information to the direct measurements, that is necessary to draw proper conclusions. Asymptotic Normalization Coefficients method can extract information about direct radiative capture like (p, γ), (n, γ), (α, γ) at low energies. The older accelerator types can be used with indirect methods, if they can accelerate light ion beams like deuteron and 3He at energies around 20 MeV, which is a case of the NPI CAS cyclotron U120M. The ANC method measurements were performed here from the dawn of the method from 90-ties until now in collaboration NPI - TA&MU - INFN-LNS developments driven by A.M.Mukhamedzhanov, R.Tribble and V.Kroha

Historical excursion
Optical model
DWBA approach
Asymptotic Normalization Coefficients
Validity tests
Summary
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