Neutron capture cross sections of 74Ge, 76Ge, and 75As at 25 keV

被引：21

作者：

Marganiec, J. ^{[1
,2
,8
]}

Dillmann, I. ^{[2
]}

Pardo, C. Domingo ^{[2
]}

Kaeppeler, F. ^{[2
]}

Reifarth, R. ^{[1
,3
]}

Gallino, R. ^{[4
]}

Pignatari, M. ^{[5
,6
]}

Grabmayr, P. ^{[7
]}

机构：

[1] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany

[2] Forschungszentrum Karlsruhe, Inst Kernphys, D-76344 Eggenstein Leopoldshafen, Germany

[3] Goethe Univ Frankfurt, D-60438 Frankfurt, Germany

[4] Univ Turin, Dipartimento Fis Gen, I-10125 Turin, Italy

[5] Univ Keele, Keele ST5 5BG, Staffs, England

[6] Univ Notre Dame, JINA, Notre Dame, IN 46556 USA

[7] Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany

[8] Univ Lodz, PL-90131 Lodz, Poland

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 06期

关键词：

S-PROCESS NUCLEOSYNTHESIS; DOUBLE-BETA DECAY; GIANT BRANCH STARS; MASSIVE STARS; WEAK COMPONENT; EVOLUTION; NUCLEAR; SEARCH;

D O I：

10.1103/PhysRevC.79.065802

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 neutron capture cross sections of Ge-74, Ge-76, and As-75 have been measured at the Karlsruhe Van de Graaff accelerator by means of the activation technique. The neutron source reaction Li-7(p,n)Be-7 was used for simulating a thermal energy distribution for kT=25 keV to determine the astrophysically relevant stellar cross sections directly. Based on an extended series of activations, consistent results could be obtained, corresponding to Maxwellian average cross sections at kT=30 keV of 37.6 +/- 3.9 mb for Ge-74, 21.5 +/- 1.8 mb for Ge-76, and 362 +/- 19 mb for As-75. These results are more accurate than previous data and are, therefore, important for resolving previous discrepancies. By extrapolation Maxwellian averaged cross sections were derived for thermal energies from 5 to 100 keV. The implications of these results for the s-process abundances in massive stars and for the background conditions in double beta decay experiments are discussed.</p>.

引用

页数：11

共 12 条

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Meierhofer, G.
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CNR '09: SECOND INTERNATIONAL WORKSHOP ON COMPOUND NUCLEAR REACTIONS AND RELATED TOPICS, 2010, 2
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PHYSICAL REVIEW C, 2013, 88 (05):
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NUCLEAR PHYSICS A, 2022, 1017
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PHYSICAL REVIEW C, 2010, 81 (03):
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PHYSICAL REVIEW C, 2021, 104 (04)
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