Hydrogen burning of 17O in classical novae.
We report on the observation of a previously unknown resonance at E(lab)(R)=194.1+/-0.6 keV in the 17O(p,alpha)14N reaction, with a measured resonance strength omegagamma(palpha)=1.6 +/- 0.2 meV. We studied in the same experiment the 17O(p,gamma)18F reaction by an activation method and the resonance-strength ratio was found to be omegagamma(palpha)/omegagamma(pgamma) = 470 +/- 50. The corresponding excitation energy in the 18F compound nucleus was determined to be 5789.8 +/- 0.3 keV by gamma-ray measurements using the 14N(alpha, gamma)18F reaction. These new resonance properties have important consequences for 17O nucleosynthesis and gamma-ray astronomy of classical novae.
Chafa
A
A
USTHB-Faculté de Physique, BP 32, El-Alia, 16111 Bab Ezzouar, Algiers, Algeria.
Tatischeff
V
V
Aguer
P
P
Barhoumi
S
S
Coc
A
A
Garrido
F
F
Hernanz
M
M
José
J
J
Kiener
J
J
Lefebvre-Schuhl
A
A
Ouichaoui
S
S
de Séréville
N
N
Thibaud
J-P
JP