TY - JOUR
T1 - Break-out from the hot-CNO cycle studied with radioactive beams
AU - Ostrowski, A.N.
AU - Laird, A.M.
AU - Shotter, A.C.
AU - Aliotta, M.
AU - Cappuzzello, F.
AU - Cherubini, S.
AU - Cunsolo, A.
AU - Davinson, T.
AU - Galster, W.
AU - Graulich, J.S.
AU - Groombridge, D.
AU - Hinnefeld, J.
AU - Leleux, P.
AU - Michel, L.
AU - Morrow, S.
AU - Musumarra, A.
AU - Ninane, A.
AU - Spitaleri, A.
AU - Tumino, A.
AU - Vervier, J.
PY - 2002/4/22
Y1 - 2002/4/22
N2 - The 15O(α,γ)19Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance atEc.m.=504 keV which corresponds to a 19Ne excitation energy of ER=4.033 MeV. It is possible to model the15O(α,γ)19Ne reaction rate, if the branching ratio Γα/Γ and the total resonance width Γ of this state are known. Results from an exploratory 18Ne(d,p) experiment performed in inverse kinematics at Elab=44.1 MeV and 106 pps beam intensity show that the 4.033 MeV state—among other resonances of astrophysical interest—is populated in this reaction ( at θlab=138°). The determination of Γα/Γ=0.28±0.13 for another 19Ne resonance at ER=4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available.
AB - The 15O(α,γ)19Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance atEc.m.=504 keV which corresponds to a 19Ne excitation energy of ER=4.033 MeV. It is possible to model the15O(α,γ)19Ne reaction rate, if the branching ratio Γα/Γ and the total resonance width Γ of this state are known. Results from an exploratory 18Ne(d,p) experiment performed in inverse kinematics at Elab=44.1 MeV and 106 pps beam intensity show that the 4.033 MeV state—among other resonances of astrophysical interest—is populated in this reaction ( at θlab=138°). The determination of Γα/Γ=0.28±0.13 for another 19Ne resonance at ER=4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available.
KW - exotic nucleus scattering
KW - branching ratios
KW - LOW-ENERGY RESONANCES
KW - O-15(ALPHA,GAMMA)NE-19
KW - N-15(ALPHA,GAMMA)F-19
UR - http://www.scopus.com/inward/record.url?scp=17444448451&partnerID=8YFLogxK
U2 - 10.1016/S0375-9474(01)01655-4
DO - 10.1016/S0375-9474(01)01655-4
M3 - Article
SN - 0375-9474
VL - 701
SP - 621
EP - 624
JO - Nuclear Physics A
JF - Nuclear Physics A
IS - 1-4
ER -