A closer look at the pp-chain reaction in the Sun: constraining the coupling of light mediators to protons
A closer look at the pp-chain reaction in the Sun: constraining the coupling of light mediators to protons
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DOI：
10.1088/1475-7516/2021/07/042
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发表时间：
2020-12
影响因子：
6.4
通讯作者：
A. M. Suliga;S. Shalgar;G. Fuller
中科院分区：
文献类型：
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作者：
A. M. Suliga;S. Shalgar;G. Fuller
核反应的pp链是太阳产生能量的主要途径。反应序列的第一步是将两个质子转化为氘核，并发射出一个正电子和一个电子中微子。这个反应非常慢，因为它是一个弱相互作用，而且重要的是，它涉及通过库仑势垒的量子隧穿。虽然在标准模型中可以计算出高置信度的反应速率，但尚未在太阳能下测量。如果存在由非标准介体产生的相互作用，那么太阳中这种反应的速率可能会改变。我们探测这种非标准的相互作用，通过比较计算太阳演化的非标准介质的存在和不存在下，目前的太阳系年龄。这些揭示了非标准介质质量和耦合的范围，与太阳的测量属性不一致，包括太阳中微子的结果。我们对这些非标准参数的约束，在许多情况下，重叠通过其他考虑得出的，可以进一步扩展更好的信心，在太阳的金属性和太阳中微子CNO通量的值。有趣的是，我们的工作揭示了太阳金属性和所调用的非标准介质的存在之间的简并性。
The pp-chain of nuclear reactions is the primary route for energy production in the Sun. The first step in that reaction sequence converts two protons to a deuterium nucleus with the emission of a positron and electron neutrino. This reaction is extremely slow because it is a weak interaction, and significantly, it involves quantum tunneling through the Coulomb barrier. Though the reaction rate can be calculated with high confidence in the Standard Model, it has not been measured at solar energies. If there exist interactions that are engendered by non-standard mediators then the rate of this reaction in the Sun could be altered. We probe such non-standard interactions by comparing calculations of solar evolution to the current solar system age in the presence and absence of the non-standard mediators. These reveal ranges of non-standard mediator mass and couplings that are inconsistent with measured properties of the Sun, including solar neutrino results. Our constraints on these non-standard parameters, in many cases overlapping those derived via other considerations, could be extended further with better confidence in the value of the metalicity of the Sun and the solar neutrino CNO flux. Intriguingly, our work reveals a degeneracy between the solar metalicity and the presence of the invoked non-standard mediators.