G. Vancraeynest et al., NE-19(P,GAMMA)NA-20 AND NE-19(D,N)NA-20 REACTIONS AND ITS ASTROPHYSICAL IMPLICATIONS FOR THE TRANSITION OF THE HOT CNO CYCLE TO THE RP PROCESS, Physical review. C. Nuclear physics, 57(5), 1998, pp. 2711-2723
The population of the Na-20 resonances at 448, 661, 797, and 887 keV a
bove the proton threshold has been studied in measurements of the Ne-1
9(p,gamma)Na-20 reaction with radioactive Ne-19 beams. The data have b
een analyzed fully in terms of resonance strengths, enabling a compari
son with theoretical estimates and the extraction of upper and lower l
imits on the resonant part of the Ne-19(p, gamma)Na-20 astrophysical r
eaction rate. The total cross section of the Ne-19(d,n)Na-20 reaction
has been measured from 0.6 to 1.8 MeV (c.m.). On the basis of the resu
lts of a subsequent distorted-wave Born approximation analysis the dir
ect component of the Ne-19(p,gamma)Na-20 astrophysical reaction rate h
as been calculated in a potential model. The astrophysical implication
s of the resulting total reaction rate have been investigated: the con
ditions for the breakout from the hot CNO cycle into the rapid-proton
capture process are determined by the preceding O-15(alpha, gamma)Ne-1
9 reaction and the photodisintegration of the produced Na-20 nuclei wi
ll not impede the breakout. [S0556-2813(98)05305-9].