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

被引：140

作者：

Bemmerer, D.

Confortola, F.

Costantini, H.

Formicola, A.

Gyurky, Gy.

Bonetti, R.

Broggini, C.

Corvisiero, P.

Elekes, Z.

Fulop, Zs.

Gervino, G.

Guglielmetti, A.

Gustavino, C.

Imbriani, G.

Junker, M.

Laubenstein, M.

Lemut, A.

Limata, B.

Lozza, V.

Marta, M.

Menegazzo, R.

Prati, P.

Roca, V.

Rolfs, C.

Alvarez, C. Rossi

Somorjai, E.

Straniero, O.

Strieder, F.

Terrasi, F.

Trautvetter, H. P.

机构：

[1] Ist Nazl Fis Nucl, Sezione Padova, I-35131 Padua, Italy

[2] Univ Genoa, Genoa, Italy

[3] Ist Nazl Fis Nucl, Sezione Genova, Genoa, Italy

[4] Lab Nazl Gran Sasso, Ist Nazl Fis Nucl, Assergi, AQ, Italy

[5] Inst Nucl Res, ATOMKI, H-4001 Debrecen, Hungary

[6] Univ Milan, Ist Fis Gen Appl, Milan, Italy

[7] Ist Nazl Fis Nucl, Sezione Milano, I-20133 Milan, Italy

[8] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy

[9] Ist Nazl Fis Nucl, Sezione Torino, Turin, Italy

[10] Ruhr Univ Bochum, Inst Expt Phys 3, D-4630 Bochum, Germany

[11] Ist Nazl Fis Nucl, Sezione Napoli, I-80125 Naples, Italy

[12] Osservatorio Astron Collurania, Teramo, Italy

[13] Ist Nazl Fis Nucl, Sezione Napoli, I-80125 Naples, Italy

[14] Univ Naples 2, Caserta, Italy

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 12期

关键词：

BIG-BANG NUCLEOSYNTHESIS; SOLAR GAMOW PEAK; 1ST MEASUREMENT; HE-3(HE-4; GAMMA)BE-7; REACTION; ASTROPHYSICAL ENERGIES; GAMMA)LI-7 REACTIONS; S-FACTOR; GAMMA)O-15; N-14(P; LUNA;

D O I：

10.1103/PhysRevLett.97.122502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nuclear physics input from the He-3(alpha,gamma)Be-7 cross section is a major uncertainty in the fluxes of Be-7 and B-8 neutrinos from the Sun predicted by solar models and in the Li-7 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 gamma-counting facilities, the He-3(alpha,gamma)Be-7 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 He-3(alpha,gamma)Be-7 astrophysical S factor to solar energies.

引用

页数：5

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