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Role of Fundamental Constants in Bbn: What Can We Learn from Nuclear Models?
| Content Provider | Semantic Scholar |
|---|---|
| Author | Descouvemont, Pierre |
| Copyright Year | 2014 |
| Abstract | Variations of fundamental constants, such as the fine structure constant or the quark masses, can be linked to variations of the deuteron binding energy BD [1]. In nuclear physics, this quantity directly depends on the nucleon-nucleon (NN) interaction. Slight modifications of the NN interaction may significantly affect some reactions, in particular those presenting a low-energy resonance. In that case, the reaction rate is strongly sensitive to the resonance energy. We focus here on the triple- process, which essentially depends on the energy of the Hoyle state [2] (0+2 located 0.38 MeV above the 3 threshold). The 12C nucleus is described by a microscopic three-cluster model [3], by using the Minnesota NN interaction [4]. This potential reproduces the experimental binding energy of the deuteron (BD=2.22 MeV). By slightly renormalizing the NN interaction, we get simultaneous variations of BD and of the 12C(0+2) energy. Then we can analyse the triple- reaction rate as a function of BD. From a study of He burning in 15 solar mass stars, we conclude that physical variations of BD should be in the interval -0.023<BD/BD<+0.011 [5]. Similar calculations have been performed on A=5 and A=8 nuclei [6]. An investigation of the 14N(p,)15O reaction rate is in progress. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://nic2014.org/slides/nic2014_descouvemont.pdf |
| Alternate Webpage(s) | http://nic2014.org/img/nicedit/descouvemont.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
