This communication is a summary of our measurements of cross sections and astrophysical S-factors for radiative proton capture on deuteron. The measurements are a part of a new program to study light-ion induced nuclear capture and inelastic scattering reactions relevant to nucleosynthesis and astrophysics. We are primarily interested in the capture reactions relevant to primordial or Big Bang Nucleosynthesis (BBN). Section 1 provides a brief and general overview of nuclear astrophysics and the primary experimental challenges in the measurements of cross sections and S-factors for reactions relevant to nuclear astrophysics. The next section discusses the significance of the $$d(p,\gamma )^{3}\text{He}$$ d ( p , γ ) 3 He reaction in context of BBN and the need for generating a more precise data in the relevant energy window. The subsequent section is devoted to the experiment and results of measurements of cross sections and astrophysical S-factors for the $$d(p,\gamma )^{3}\text{He}$$ d ( p , γ ) 3 He reaction at three new BBN energies. One salient features of the measurements is the use of large volume LaBr $$_{3}$$ 3 :Ce scintillation detector for measurement of the capture $$\gamma $$ γ -rays. To the best of our knowledge, capture $$\gamma $$ γ -rays for this reaction had so far been measured with NaI(Tl) or HPGe detectors only. The detection efficiency of the detector has been measured experimentally for different monochromatic $$\gamma $$ γ -ray energies. In addition, realistic GEANT4 Monte Carlo simulations have been carried out to generate the response of the detector for $$\gamma $$ γ -ray energies of interest. The measured cross section and astrophysical S ( E )-factor for the three incident proton energies are found to be in agreement with the overall trend of the global data set for the BBN region, reported in the literature. The measured S-factors are also found to be in agreement with recent microscopic calculations of Marcucci et al . (2016).

中文翻译：

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在 BBN 能量下 $$d(p,\gamma )^{3}\text{He}$$ 反应的横截面和 S 因子的新测量值

本次交流是我们对氘核上辐射质子捕获的横截面和天体物理 S 因子的测量结果的总结。这些测量是研究与核合成和天体物理学相关的光离子诱导的核俘获和非弹性散射反应的新计划的一部分。我们主要对与原始或大爆炸核合成 (BBN) 相关的捕获反应感兴趣。第 1 节简要概述了核天体物理学以及测量与核天体物理学相关的反应的横截面和 S 因子的主要实验挑战。下一节讨论 $$d(p,\gamma )^{3}\text{He}$$ d ( p , γ ) 3 He 反应在 BBN 背景下的重要性以及生成更精确数据的必要性在相关的能源窗口。下一节专门介绍 $$d(p,\gamma )^{3}\text{He}$$ d ( p , γ ) 3 He 的横截面和天体物理 S 因子的实验和测量结果在三个新的 BBN 能量下的反应。测量的一个显着特征是使用大体积 LaBr $$_{3}$$ 3 :Ce 闪烁探测器来测量捕获 $$\gamma $$ γ 射线。据我们所知，迄今为止，仅使用 NaI(Tl) 或 HPGe 探测器测量了此反应的 $$\gamma $$ γ 射线。已针对不同的单色 $$\gamma $$ γ 射线能量通过实验测量了探测器的探测效率。此外，已经进行了真实的 GEANT4 蒙特卡罗模拟，以生成探测器对 $$\gamma $$ γ 射线能量的响应。发现三个入射质子能量的测量横截面和天体物理 S ( E ) 因子与文献中报道的 BBN 区域全球数据集的总体趋势一致。还发现测量的 S 因子与 Marcucci 等人最近的微观计算一致。(2016)。