论文标题
$^{154} $ gd（n，$γ$）横截面及其天体物理含义的测量
Measurement of the $^{154}$Gd(n,$γ$) cross section and its astrophysical implications
论文作者
论文摘要
$^{154} $ gd的中子捕获横截面在从Cern N \ _tof中子泄漏源的185 m的实验区域中测量，使用Gadolinium的金属样本，富含$^{154} $ GD。用四个C $ _ {6} $ d $ _ {6} $闪烁探测器执行的捕获测量值是通过在Gelina飞行时间（JRC-GEEL）进行的传输测量来补充的，从而使与样品组合相关的不确定性最小化。在S过程核合成模型的感兴趣温度范围内推导了准确的麦克斯韦平均捕获横截面（MAC）。我们报告Mac的值为880（50）MB，$ kt = 30 $ keV，与文献中可用的值相比，其值大大降低。新的采用的$^{154} $ gd（n，$γ$）横截面减少了S-Process核合成模型预测的观察到的和计算出的太阳S-仅S-仅S-仅S-仅S-仅S-仅S- s- s-s-s-s-同位素丰度。
The neutron capture cross section of $^{154}$Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n\_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67$\%$ in $^{154}$Gd. The capture measurement, performed with four C$_{6}$D$_{6}$ scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. An accurate Maxwellian averaged capture cross section (MACS) was deduced over the temperature range of interest for s process nucleosynthesis modeling. We report a value of 880(50) mb for the MACS at $kT=30$ keV, significantly lower compared to values available in literature. The new adopted $^{154}$Gd(n,$γ$) cross section reduces the discrepancy between observed and calculated solar s-only isotopic abundances predicted by s-process nucleosynthesis models.
