A measurement of the Ne-22(n, gamma)Ne-23 capture cross section at a stellar temperature of kT = 25 keV
A measurement of the Ne-22(n, gamma)Ne-23 capture cross section at a stellar temperature of kT = 25 keV
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kT = 25 keV 恒星温度下 Ne-22(n, gamma)Ne-23 俘获截面的测量
DOI：
10.1086/170518
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
F. Kaeppeler
中科院分区：
文献类型：
--
作者：
H. Beer;G. Rupp;F. Voss;F. Kaeppeler
用快速循环活化法测定了22Ne的俘获截面。测量是在卡尔斯鲁厄3.75 mV脉冲Van de Graaff加速器上进行的，利用接近反应阈值的7Li(p，n)反应产生分布类似于麦克斯韦谱(KT=25keV)的中子。活化样品包括浓缩的22Ne(99.9%)和不锈钢球(直径20 mm，壁厚0.5 mm)中含有的天然Kr气体的混合物。样品的活度用高分辨率的Ge(Li)探测器通过439keV的23Neγ谱线进行计数。在KT=25keV下，22Ne俘获截面为66.0±5.0μ
The capture cross section of 22 Ne has been determined by a fast cyclic activation technique. The measurements were carried out at the Karlsruhe 3.75 MV pulsed Van de Graaff accelerator using the 7 Li(p, n) reaction close to the reaction threshold to generate neutrons with a distribution resembling a Maxwell spectrum of kT=25 keV. The activation samples consisted of a mixture of enriched 22 Ne (99.9%) and natural Kr-gas contained in stainless steel spheres (20 mm diameter and 0.5 mm wall thickness). The activity of the samples was counted with a high-resolution Ge(Li) detector via the characteristic 439 keV 23 Ne γ-ray line. The 22 Ne capture cross section at kT=25 keV was found to be 66.0±5.0 μbarn