New measurements of cross sections and S-factors for $$d(p,\gamma )^{3}\text{He}$$ d
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J. Astrophys. Astr. (2020)41:32 https://doi.org/10.1007/s12036-020-09647-6
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New measurements of cross sections and S-factors for dðp; cÞ3 He reaction at BBN energies INDRANIL MAZUMDAR Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India. E-mail: [email protected] MS received 14 September 2020; accepted 17 September 2020 Abstract. This communication is a summary of our measurements of cross sections and astrophysical Sfactors 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 dðp; cÞ3 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 dðp; cÞ3 He reaction at three new BBN energies. One salient features of the measurements is the use of large volume LaBr3 :Ce scintillation detector for measurement of the capture c-rays. To the best of our knowledge, capture c-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 c-ray energies. In addition, realistic GEANT4 Monte Carlo simulations have been carried out to generate the response of the detector for c-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). Keywords. BBN—Capture reaction—Scintillation detectors.
1. Introduction For nearly five decades, global efforts in low- and medium-energy nuclear physics are centered around heavy-ion-induced reactions. However, the broad canvas of nuclear physics provides ample opportunities to use other projectiles, namely, light ions, photons, electrons and neutrons to explore many other dimensions of nuclear physics. Light-ion-induced reactions, primarily, proton-induced capture and
This article is part of the Topical Collection: Chemical elements in the Universe: Origin and evolution.
inelastic scattering reactions play a dominant role in studying nuclear reactions relevant to astrophysics and nucleosynthesis. The primary goals of nuclear astrophysics are understanding the (a)
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