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Titolo:
Weak proton capture on He-3 - art. no. 015801
Autore:
Marcucci, LE; Schiavilla, R; Viviani, M; Kievsky, A; Rosati, S; Beacom, JF;
Indirizzi:
Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA Old Dominion Univ Norfolk VA USA 23529 , Dept Phys, Norfolk, VA 23529 USA Jefferson Lab, Newport News, VA 23606 USA Jefferson Lab Newport News VA USA 23606 n Lab, Newport News, VA 23606 USA Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy Ist Nazl Fis Nucl Pisa Italy I-56100 Nucl, Sez Pisa, I-56100 Pisa, Italy Univ Pisa, Dept Phys, I-56100 Pisa, Italy Univ Pisa Pisa Italy I-56100Univ Pisa, Dept Phys, I-56100 Pisa, Italy CALTECH, Phys Dept 161 33, Pasadena, CA 91125 USA CALTECH Pasadena CA USA91125 H, Phys Dept 161 33, Pasadena, CA 91125 USA
Titolo Testata:
PHYSICAL REVIEW C
fascicolo: 1, volume: 6301, anno: 2001,
pagine: 5801 -
SICI:
0556-2813(200101)6301:1<5801:WPCOH->2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEUTRINO ENERGY-SPECTRUM; MONTE-CARLO CALCULATIONS; FEW-BODY NUCLEI; CROSS-SECTION; FORM-FACTORS; HEP-NEUTRINOS; BETA-DECAY; POLARIZATION OBSERVABLES; ELECTRON-SCATTERING; MESONIC ENHANCEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
91
Recensione:
Indirizzi per estratti:
Indirizzo: Marcucci, LE Univ Pisa, Dept Phys, I-56100 Pisa, Italy Univ Pisa Pisa Italy I-56100 Dept Phys, I-56100 Pisa, Italy
Citazione:
L.E. Marcucci et al., "Weak proton capture on He-3 - art. no. 015801", PHYS REV C, 6301(1), 2001, pp. 5801

Abstract

The astrophysical S factor for the proton weak capture on He-3 is calculated with correlated-hyperspherical-harmonics bound and continuum wave functions corresponding to realistic Hamiltonians consisting of the Argonne nu (14) or Argonne nu (18) two-nucleon and Urbana-VIII or Urbana-IX three-nucleon interactions. The nuclear weak charge and current operators have vector and axial-vector components that include one- and many-body terms. All possible multipole transitions connecting any of the p-He-3 S- and P-wave channels to the He-4 bound state are considered. The S factor at a p-He-3 center-of-mass energy of 10 keV, close to the Gamow-peak energy, is predicted to be 10.1 x 10(-20) keV b with the AV18/UIX Hamiltonian, a factor of similar or equal to1.5 larger than the value adopted in the standard solar model. The P-wave transitions are found to be important, contributing about 40% of the calculated S factor. The energy dependence is rather weak: the AV18/UIX zero-energy S factor is 9.64 x 10(-20) keV b, only 5% smaller than the 10 keV result quoted above. The model dependence is also found to be weak: the zero-energy S factor is calculated to be 10.2 x 10(-20) keV b with the older AV14/UVIII model, only 6% larger than the AV18/UIX result. Our best estimate for the S factor at 10 keV is therefore (10.1+/-0.6) x 10(-20) keV b, when the theoretical uncertainty due to the model dependence is included. This value for the calculated S factor is not as large as determined in fits to the Super-Kamiokande data in which the hrp flux normalization is free. However, the precise calculation of the S factor and the consequent absoluteprediction for the hrp neutrino flux will allow much greater discrimination among proposed solar neutrino oscillation solutions.

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Documento generato il 08/04/20 alle ore 08:40:02