Neutron-induced background by an α-beam incident on a deuterium gas target and its implications for the study of the 2H(α,γ)6Li reaction at LUNA

被引：37

作者：

Anders, M. ^{[1
]}

Trezzi, D. ^{[2
]}

Bellini, A. ^{[3
,4
]}

Aliotta, M. ^{[5
]}

Bemmerer, D. ^{[1
]}

Broggini, C. ^{[6
]}

Caciolli, A. ^{[6
]}

Costantini, H. ^{[3
,4
]}

Corvisiero, P. ^{[3
,4
]}

Davinson, T. ^{[5
]}

Elekes, Z. ^{[1
]}

Erhard, M. ^{[6
]}

Formicola, A. ^{[7
]}

Fueloep, Zs. ^{[8
]}

Gervino, G. ^{[9
,10
]}

Guglielmetti, A. ^{[2
,11
]}

Gustavino, C. ^{[12
]}

Gyuerky, Gy. ^{[8
]}

Junker, M. ^{[7
]}

Lemut, A. ^{[3
,4
]}

Marta, M. ^{[1
]}

Mazzocchi, C. ^{[2
]}

Menegazzo, R. ^{[6
]}

Prati, P. ^{[3
,4
]}

Alvarez, C. Rossi ^{[6
]}

Scott, D. ^{[5
]}

Somorjai, E. ^{[8
]}

Straniero, O. ^{[13
,14
]}

Szuecs, T. ^{[8
]}

机构：

[1] HZDR, Dresden, Germany

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

[3] Univ Genoa, Dipartimento Fis, Genoa, Italy

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

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

[6] Ist Nazl Fis Nucl, Sez Padova, Padua, Italy

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

[8] Inst Nucl Res ATOMKI, Debrecen, Hungary

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

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

[11] Univ Milan, Milan, Italy

[12] Ist Nazl Fis Nucl, Sez Roma La Sapienza, Rome, Italy

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

[14] Osservatorio Astron Collurania, Teramo, Italy

来源：

EUROPEAN PHYSICAL JOURNAL A | 2013年 / 49卷 / 02期

关键词：

NUCLEAR ASTROPHYSICS; CAPTURE; SCATTERING; DETECTORS; LI-6; NUCLEOSYNTHESIS; ENERGIES;

D O I：

10.1140/epja/i2013-13028-5

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The production of the stable isotope Li-6 in standard Big Bang nucleosynthesis has recently attracted much interest. Recent observations in metal-poor stars suggest that a cosmological Li-6 plateau may exist. If true, this plateau would come in addition to the well-known Spite plateau of Li-7 abundances and would point to a predominantly primordial origin of Li-6, contrary to the results of standard Big Bang nucleosynthesis calculations. Therefore, the nuclear physics underlying Big Bang Li-6 production must be revisited. The main production channel for Li-6 in the Big Bang is the 2 H(alpha,gamma)Li-6 reaction. The present work reports on neutron-induced effects in a high-purity germanium detector that were encountered in a new study of this reaction. In the experiment, an a-beam from the underground accelerator LUNA in Gran Sasso, Italy, and a windowless deuterium gas target are used. A low neutron flux is induced by energetic deuterons from elastic scattering and, subsequently, the H-2(d,n)He-3 reaction. Due to the ultra-low laboratory neutron background at LUNA, the effect of this weak flux of 2-3MeV neutrons on well-shielded high-purity germanium detectors has been studied in detail. Data have been taken at 280 and 400 keV alpha-beam energy and for comparison also using an americium-beryllium neutron source.

引用

页码：1 / 13

页数：13

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