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Communication Dans Un Congrès Année : 2020

Impact of forbidden electron capture in intermediate-mass stars

Dag F. Strömberg
  • Fonction : Auteur
Gabriel Martinez-Pinedo
  • Fonction : Auteur
Samuel Jones
  • Fonction : Auteur
Oliver S. Kirsebom
  • Fonction : Auteur

Résumé

Intermediate-mass stars (7-11 M⊙) form degenerate ONe cores following carbon burning. In some cases the cores grow dense enough to trigger electron capture on various nuclei. The double electron capture 20Ne(e-, v e)20F(e-, νe )20O releases enough heat to trigger runaway oxygen burning. Depending on the conditions at ignition the outcome is either a collapse to a neutron star or a thermonuclear explosion with an ONeFe remnant. We have investigated the impact of two forbidden transitions on the ignition conditions using the MESA stellar evolution code. The 0+ → 2+ transition between the ground states of 20Ne and 20F has been measured experimentally and is found to decrease the ignition density while pushing the point of ignition off-centre. We have also studied the 2+ → 4+ transition between 24Na and 24Ne through a shell model calculation. Its impact is found to be marginal in our simulations, but it might play a role in the development of convectional instabilities.

Dates et versions

hal-02999573 , version 1 (10-11-2020)

Identifiants

Citer

Dag F. Strömberg, Gabriel Martinez-Pinedo, Samuel Jones, Oliver S. Kirsebom, Frédéric Nowacki. Impact of forbidden electron capture in intermediate-mass stars. 9th Nuclear Physics in Astrophysics, Sep 2019, Frankfurt, Germany. pp.012040, ⟨10.1088/1742-6596/1668/1/012040⟩. ⟨hal-02999573⟩
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