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Description ab initio of nuclear decay and break-up during reactions in light nuclei.

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Date Limite Candidature : mercredi 19 mai 2021

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General information

Reference : UMR9012-GUIHUP-003
Workplace : ORSAY
Date of publication : Wednesday, April 28, 2021
Scientific Responsible name : Guillaume Hupin
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Radioactivity, although discovered in 1896 by Becquerel during work on phosphorescence, remains one of the most fundamental mechanisms for our understanding of the Universe while being among the least accurately modeled in theoretical physics.

Our approach combines effective field theories (EFT) and ab initio methods (AIMs). These tools are complementary and most importantly provide a means for quantifying the reliability of the calculations. While EFTs have brought in our field the missing link to the underlying QCD and the hope to quantify theoretical uncertainties, AIMs provide exact solutions within a computable error margin of the bound (or more rarely scattering) many-body problem. They are nonetheless generally limited to small number of constituents. The goal of the PhD is to develop the tools necessary to study the 2p cluster emission, the breakup reaction of charged particles and to participate to effort to model beta-delayed particle emission. The occurrence of N, NN etc... cluster states in the vicinity of their respective threshold is a hot topic in nuclear physic, if N=p any decays from low-lying states become a quantum tunneling effect. Our main field of investigation will be to tackle the three- and four-body continuum with non-relativistic charged particle. As a first step (the M2 internship goal), we will apply the complex scaling method to the ab initio No-Core Shell Model, a configuration mixing method that allows for a nearly-exact solution of the Schrödinger equation, one combined they allow for the computation of resonant states.

Work Context

By being located at the IJClab, the student will benefit from an environment particularly suited to the topic. We look forward to having constructive discussions with the nuclear astrophysics group in the context of primordial nucleosynthesis and r-process.

Once the numerical methods are in place and tested, calculation time will be required on the national tier-1 supercomputers at GENCI.

Additional Information

Website of the IN2P3 team:

https://sites.google.com/view/phynet-team/home

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