S-Factor measurement of the12C(p,γ)13N reaction in inverse kinematics

Klaus Stöckel,L Wagner,St Gohl,Tobias P Reinhardt,D Bemmerer,K Zuber,S Akhmadaliev,K Schmidt,T Szücs,M P Takács,S Reinicke,M Serfling,R Schwengner

doi:10.1051/epjconf/20159303012

Klaus Stöckel, L Wagner + Show 11 more

Open Access

https://doi.org/10.1051/epjconf/20159303012

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Abstract

Hydrogen rich solid targets have been developed and produced to investigate the 12 C(p, γ ) 13 N reaction in inverse kinematics. The SRIM simulation software has been used to determine the parameters for ion implantation in various materials. Nuclear Resonant Reacton Analysis (NRRA) with the resonant reaction 15 N(p, αγ ) 12 C has been carried out to measure the hydrogen content of the produced targets. Measurements of the produced targets at the energy range from E cm = 577 keV down to E cm = 191 keV, were performed at the 3-MV Tandetron of Helmholtz-Zentrum Dresden-Rossendorf (HZDR).

Highlights

The 12C(p, γ)13N reaction is the next-to-slowest reaction and the buildup reaction in the CNO cycle
In order to correctly determine the parameters for the ion implantation, several simulations were done with the ions / nm
From the SRIM simulations two parameters, ion energy and fluence were obtained for the ion implantation (Table1)

Summary

Introduction

The 12C(p, γ)13N reaction is the next-to-slowest reaction and the buildup reaction in the CNO cycle. The reaction is very important for nuclear energy generation in massive stars [1]. It is of great interest to achieve data of the astrophysical S-factor S(E) for the 12C(p, γ)13N reaction at astrophysical interesting energies. For modern neutrino physics this reaction is interesting, because it is a source of low-energy solar neutrinos measured in several neutrino experiments like GALLEX, SNO and many more [3,4,5]. Recent data for the astrophysical S-factor exists only for energies down to Ecm ≥ 300 keV [7]. We used a 12C++ beam (2.0 - 7.5 MeV) for the S-factor measurements and a 15N++ beam (6.2 - 7.6 MeV) for the target characterisation. The evaporation of the developed targets was done at HZDR. The prompt γ rays were measured with a HPGe detector with 60 % relative efficiency at an angle of 55◦ relative to the beam axis

Simulations for target production

Hydrogen profile

Outlook

Findings

Target production