First measurement of the He-3(He-3, 2p)He-4 cross section down to the lower edge of the solar Gamow peak

Citation
R. Bonetti et al., First measurement of the He-3(He-3, 2p)He-4 cross section down to the lower edge of the solar Gamow peak, PHYS REV L, 82(26), 1999, pp. 5205-5208
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
82
Issue
26
Year of publication
1999
Pages
5205 - 5208
Database
ISI
SICI code
0031-9007(19990628)82:26<5205:FMOTH2>2.0.ZU;2-2
Abstract
We give the LUNA results on the sigma(E) cross section measurement of a key reaction of the proton-proton chain strongly affecting the calculated neut rino luminosity from the Sun: He-3(He-3, 2p)He-4. Because of the cosmic ray suppression provided by the Gran Sasso underground laboratory, it has been possible to measure sigma(E) throughout the energy range in which this rea ction occurs in the Sun, i.e., down to 16.5 keV center of mass energy. The data clearly show the cross section increase due to the electron screening effect but they do not exhibit any evidence for a narrow resonance suggeste d to explain the B-8 and Be-7 solar neutrino flux reduction.