Indirect methods: A bridge between nuclei and stars

La Cognata, M. (2024) Indirect methods: A bridge between nuclei and stars. Il nuovo cimento C, 47 (2). pp. 1-6. ISSN 1826-9885

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Nuclear reactions in stars generally take place at energies well below 1 MeV, therefore the Coulomb barrier exponentially suppresses the cross section down to values as small as few nanobarns in the case of charged particles. This makes it very difficult to provide accurate input data for astrophysics so indirect methods have been introduced. In particular, the ANC and the THM techniques have been used to deduce the cross sections of reactions with photons and charged particles in the exit channel, respectively, with no need of extrapolation. Recent results of the application of the two methods are discussed: the 6Li(3He,d)7Be measurement used to deduced the ANC’s of the 3He + 4He→ 7Be and p + 6Li → 7Be channels and the corresponding radiative-capture cross sections. The THM measurement of the 27Al(p,α)24Mg cross section through the 2H(27Al,α 24Mg)n reaction is also illustrated. In both cases, we were able to establish the cross section at astrophysical energies with unprecedented accuracy.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 20 May 2024 14:30
Last Modified: 20 May 2024 14:30

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