Personal tools
You are here: Home Join a researc... Stages scienti... Thèses - PhD Study of a ...

Study of a nucleosynthesis process occurring in supernovae

Experimental and theoretical nuclear astrophysics

Various astrophysical scenarios lead to the production of atomic nuclei composing the matter. They involve different nucleosynthesis processes. The p-process is responsible for the formation of rare, stable proton-rich nuclei. According to the dominant scenario, it would take place during supernovae, via a chain of photodesintegration reactions. Such scenario has to be confirmed or moderated by a precise knowledge of the involved reactions. 

A scientific program, lead by physics of GANIL and IPN Lyon, which aim to study some of the most important reactions by measuring proton and alpha capture cross sections at the SPIRAL2 facility is under construction. The measurements will be performed by gamma spectroscopy (activation or in-beam depending on the reaction of interest). The foreseen in-beam gamma ray spectroscopy studies will take advantage of the high efficiency and resolution performances of the new generation multi-detectors such as PARIS.

- During the thesis, the student will first work on the definition of the best experimental setup configurations, which optimizes these performances, through GEANT4 simulations and considering the following key reactions: 74Ge(p,g)75As and 70Ge(a,g)74Se. The simulations will be developed and supervised within the IPN Lyon group.

- In parallel, the student will analyse the data of an experiment that will take place in 2017 at IFIN-Bucarest which aim to measure for the first time, through the activation method, the cross section of the 72Ge(p,g)73As key reaction. This part of the thesis will be supervised by the GANIL group.

In addition to the simulation work and the data analysis, the student will work during the interpretation phase with the well-established statistical Hauser-Feshbach model code TALYS. Constraints on model parameters (optical potential, level density and gamma strength) for further cross section evaluations are foreseen. Both groups (GANIL and IPN Lyon) will supervise this activity.

 

Expected skills:  motivation for nuclear physics (structure and reactions) and its role in astrophysics ; good knowledge of C++ programming (or will to learn this necessary tool for analysis and simulations).


Contact :  Beyhan BASTIN

GANIL, BP 5027, 14 076 Caen cedex 05


Tél. 02 31 45 49 92

 Fax : 02 31 45 44 21 

e-mail : bastin_at_ganil.fr


 

Contact :  Camille DUCOIN

IPN Lyon


Tél. 04 72 43 13 41

 

e-mail : c.ducoin_at_ipnl.in2p3.fr



Document Actions