First Direct Measurement of the 2H(α,γ)6Li Cross Section at Big Bang Energies and the Primordial Lithium Problem

被引：106

作者：

Anders, M. ^{[1
]}

Trezzi, D. ^{[2
,3
,13
]}

Menegazzo, R. ^{[4
]}

Aliotta, M. ^{[5
]}

Bellini, A. ^{[6
,14
]}

Bemmerer, D. ^{[1
]}

Broggini, C. ^{[4
]}

Caciolli, A. ^{[4
]}

Corvisiero, P. ^{[6
,14
]}

Costantini, H. ^{[6
,14
]}

Davinson, T. ^{[5
]}

Elekes, Z. ^{[1
]}

Erhard, M. ^{[4
]}

Formicola, A. ^{[7
]}

Fueloep, Zs. ^{[8
]}

Gervino, G. ^{[9
,15
]}

Guglielmetti, A. ^{[3
,13
]}

Gustavino, C. ^{[10
]}

Gyuerky, Gy. ^{[8
]}

Junker, M. ^{[7
]}

Lemut, A. ^{[6
,14
]}

Marta, M. ^{[1
]}

Mazzocchi, C. ^{[3
,13
]}

Prati, P. ^{[6
,14
]}

Alvarez, C. Rossi ^{[4
]}

Scott, D. A. ^{[5
]}

Somorjai, E. ^{[8
]}

Straniero, O. ^{[11
,12
]}

Szuecs, T. ^{[8
]}

机构：

[1] Helmholtz Zentrum Dresden Rossendorf, D-01328 Dresden, Germany

[2] Tech Univ Dresden, D-01069 Dresden, Germany

[3] Univ Milan, I-20133 Milan, Italy

[4] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[5] Univ Edinburgh, Sch Phys & Astron, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

[6] Univ Genoa, I-16146 Genoa, Italy

[7] LNGS, I-67100 Laquila, Italy

[8] Inst Nucl Res MTA ATOMKI, HU-4001 Debrecen, Hungary

[9] Univ Turin, I-10125 Turin, Italy

[10] Ist Nazl Fis Nucl, Sez Roma La Sapienza, I-00185 Rome, Italy

[11] Osservatorio Astron Collurania, I-64100 Teramo, Italy

[12] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

[13] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[14] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy

[15] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 04期

关键词：

NUCLEAR ASTROPHYSICS; NUCLEOSYNTHESIS; CAPTURE; RATIO; LI-6;

D O I：

10.1103/PhysRevLett.113.042501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent observations of Li-6 in metal poor stars suggest a large production of this isotope during big bang nucleosynthesis (BBN). In standard BBN calculations, the H-2(alpha, gamma)Li-6 reaction dominates Li-6 production. This reaction has never been measured inside the BBN energy region because its cross section drops exponentially at low energy and because the electric dipole transition is strongly suppressed for the isoscalar particles H-2 and alpha at energies below the Coulomb barrier. Indirect measurements using the Coulomb dissociation of Li-6 only give upper limits owing to the dominance of nuclear breakup processes. Here, we report on the results of the first measurement of the H-2(alpha, gamma)Li-6 cross section at big bang energies. The experiment was performed deep underground at the LUNA 400 kV accelerator in Gran Sasso, Italy. The primordial Li-6/Li-7 isotopic abundance ratio has been determined to be (1.5 +/- 0.3) x 10(-5), from our experimental data and standard BBN theory. The much higher Li-6/Li-7 values reported for halo stars will likely require a nonstandard physics explanation, as discussed in the literature.

引用

页数：5

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