Abstract
The11B(p, 3α) reaction has been investigated in the energy range fromE c.m.=22 to 1100 keV with the use of either a proton beam and a11B solid target or with the use of a11B heavy ion beam incident on a hydrogen jet gas target. The reaction mechanisms have been studied via kinematically complete coincidence measurements showing that the reaction proceeds predominantly by a sequential decay via8Be. The measurement of absolute cross sections,α-angular distributions and excitation functions is reported. The astrophysicalS(E) factor has been described by means of an empirical fit to the data, leading to a zero-energy intercept ofS(0)=197±12 MeVb. Conclusions drawn on the use of this reaction as an advanced fuel in fusion reactors remain essentially unchanged by the present data.
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Supported in part by the Landesamt Nordrhein-Westfalen (IVB4-FA9171) and the Deutsche Forschungsgemeinschaft (Ro429/15-1)
The authors would like to thank L. Buchmann, S. Engstler, J. Görres, A. Krauss, P. Schmalbrock and R. Timmermann for assistance during the course of the experiments and analyses. The technical help of K. Brand and of the staff at the Dynamitron Tandem Laboratorium in Bochum is highly appreciated.