The nuclear physics input from the 3He(alpha,gamma)7Be cross section is a major uncertainty in the fluxes of 7Be and 8B neutrinos from the Sun predicted by solar models and in the 7Li abundance obtained in big-bang nucleosynthesis calculations. The present work reports on a new precision experiment using the activation technique at energies directly relevant to big-bang nucleosynthesis. Previously such low energies had been reached experimentally only by the prompt-gamma technique and with inferior precision. Using a windowless gas target, high beam intensity, and low background _-counting facilities, the 3He(alpha,gamma)7Be cross section has been determined at 127, 148, and 169 keV center-of-mass energy with a total uncertainty of 4%. The sources of systematic uncertainty are discussed in detail. The present data can be used in big-bang nucleosynthesis calculations and to constrain the extrapolation of the 3He(alpha,gamma)7Be astrophysical S factor to solar energies.

Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy / D., Bemmerer; F., Confortola; H., Costantini; A., Formicola; G., Gyurky; R., Bonetti; C., Broggini; P., Corvisiero; Z., Elekes; Z., Fulop; G., Gervino; A., Guglielmetti; C., Gustavino; Imbriani, Gianluca; M., Junker; M., Laubenstein; A., Lemut; B., Limata; V., Lozza; M., Marta; R., Menegazzo; Prati, P.; Roca, Vincenzo; C., Rolfs; C., ROSSI ALVAREZ; E., Somorjai; O., Straniero; F., Strieder; F., Terrasi; H. P., Trautvetter. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 97:(2006), pp. 122502-1-122502-5. [10.1103/PhysRevLett.97.122502]

Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy

IMBRIANI, GIANLUCA;ROCA, VINCENZO;
2006

Abstract

The nuclear physics input from the 3He(alpha,gamma)7Be cross section is a major uncertainty in the fluxes of 7Be and 8B neutrinos from the Sun predicted by solar models and in the 7Li abundance obtained in big-bang nucleosynthesis calculations. The present work reports on a new precision experiment using the activation technique at energies directly relevant to big-bang nucleosynthesis. Previously such low energies had been reached experimentally only by the prompt-gamma technique and with inferior precision. Using a windowless gas target, high beam intensity, and low background _-counting facilities, the 3He(alpha,gamma)7Be cross section has been determined at 127, 148, and 169 keV center-of-mass energy with a total uncertainty of 4%. The sources of systematic uncertainty are discussed in detail. The present data can be used in big-bang nucleosynthesis calculations and to constrain the extrapolation of the 3He(alpha,gamma)7Be astrophysical S factor to solar energies.
2006
Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy / D., Bemmerer; F., Confortola; H., Costantini; A., Formicola; G., Gyurky; R., Bonetti; C., Broggini; P., Corvisiero; Z., Elekes; Z., Fulop; G., Gervino; A., Guglielmetti; C., Gustavino; Imbriani, Gianluca; M., Junker; M., Laubenstein; A., Lemut; B., Limata; V., Lozza; M., Marta; R., Menegazzo; Prati, P.; Roca, Vincenzo; C., Rolfs; C., ROSSI ALVAREZ; E., Somorjai; O., Straniero; F., Strieder; F., Terrasi; H. P., Trautvetter. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 97:(2006), pp. 122502-1-122502-5. [10.1103/PhysRevLett.97.122502]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/109769
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