Réaction 27Al (p, γ) 28Si

Thermonuclear rates of the 28Si(p, y) reaction

2014 The 28Si(p, y) reaction data have been analysed in terms of two alternative versions of the directsemidirect model. The extrapolation of the theoretical excitation functions has been made and the astrophysical S-factor has been extracted with no significant differences between the predictions of the models. The analysis reveals the dominant role of the nonresonant process at temperatures l...

7 Be ( p , γ ) 8 B reaction

Parity Violation in − → γ p Compton Scattering

Polarized beam −→γ p Compton scattering provides a theoretically clean way to extract the isovector parity violating pion-nucleon coupling constant h (1) πNN . This channel is more tractable experimentally than the recently proposed extraction of h (1) πNN from the Bedaque-Savage process — polarized target γ −→p compton scattering. The leading parity violating effect is calculated using Heavy B...

Asymmetry in ~ n + p → d + γ

Heavy-baryon chiral perturbation theory (HBChPT) is applied to the asymmetry A γ in n+p → d + γ at threshold, which arises due to the weak parity non-conserving interactions. Instead of appealing to Siegert's theorem, transition operators up to next-to-leading chiral order are derived and the corresponding amplitudes are evaluated with the Argonne v 18 wavefunctions. In addition to the impulse ...

Parity Violation in γ−→p Compton Scattering

A measurement of parity-violating spin-dependent γ−→p Compton scattering will provide a theoretically clean determination of the parity-violating pionnucleon coupling constant h (1) πNN . We calculate the leading parity-violating amplitude arising from one-loop pion graphs in chiral perturbation theory. An asymmetry of ∼ 5×10−8 is estimated for Compton scattering of 100 MeV photons.