The Cross Section of 3He(3He,2p)4He measured at Solar Energies

Details The Cross Section of 3He(3He,2p)4He measured at Solar Energies The Cross Section of 3He(3He,2p)4He measured at Solar Energies

1997-07-10

arxiv.org/abs/nucl-ex/9707003v3

Phys.Rev.C57:2700-2710,1998

Physics

Nuclear Physics

Nuclear Experiment

18 pages, 10 postscript figures, Calculations concerning hypothetical resonanz added, Submitted to Phys. Rev. C., available at

Scientific paper

10.1103/PhysRevC.57.2700

We report on the results of the \hethet\ experiment at the underground accelerator facility LUNA (Gran Sasso). For the first time the lowest projectile energies utilized for the cross section measurement correspond to energies below the center of the solar Gamow peak ($E_{\rm 0}$=22 keV). The data provide no evidence for the existence of a hypothetical resonance in the energy range investigated. Although no extrapolation is needed anymore (except for energies at the low-energy tail of the Gamow peak), the data must be corrected for the effects of electron screening, clearly observed the first time for the \hethet\ reaction. The effects are however larger than expected and not understood, leading presently to the largest uncertainty on the quoted $S_{\rm b}(E_{\rm 0})$ value for bare nuclides (=5.40 MeV b).

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