Neutron-upscattering enhancement of the triple-alpha process.

Neutron-upscattering enhancement of the triple-alpha process.
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三α过程的中子上散射增强。

DOI:
10.1038/s41467-022-29848-7
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发表时间:
2022-04-20
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
作者:

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位于霍伊尔态的碳-12的中子非弹性散射是对三α过程感兴趣的反应。相反的过程(中子上散射)可以提高Hoyle态到12C束缚态的衰变速率,有效地提高了整体的三α反应速率。这个反应的横截面是不可能通过实验测量的,但在这里已经用详细的平衡在天体物理相关能量上确定了。利用高度准直的单能光束,我们测量了入射到充满CO2气体的德克萨斯主动目标时间投射室(TexAT TPC)上的中子,我们测量了3α-粒子(由非弹性散射后的霍伊尔态衰变产生),并提取了截面。在这里,我们显示中子上散射增强被观察到比先前预期的要小得多。因此,除了在非常特殊的天体物理位置(例如中子星合并)之外,中子上散射增强的重要性可能并不重要。三α过程在核合成中起作用,在12C的形成中。本文讨论了多步过程中中子上散射现象在三α过程中的速率和作用。
The neutron inelastic scattering of carbon-12, populating the Hoyle state, is a reaction of interest for the triple-alpha process. The inverse process (neutron upscattering) can enhance the Hoyle state’s decay rate to the bound states of 12C, effectively increasing the overall triple-alpha reaction rate. The cross section of this reaction is impossible to measure experimentally but has been determined here at astrophysically-relevant energies using detailed balance. Using a highly-collimated monoenergetic beam, here we measure neutrons incident on the Texas Active Target Time Projection Chamber (TexAT TPC) filled with CO2 gas, we measure the 3α-particles (arising from the decay of the Hoyle state following inelastic scattering) and a cross section is extracted. Here we show the neutron-upscattering enhancement is observed to be much smaller than previously expected. The importance of the neutron-upscattering enhancement may therefore not be significant aside from in very particular astrophysical sites (e.g. neutron star mergers). The triple-alpha process plays a role in nucleosynthesis, in the formation of 12C. Here, the authors discuss the rate and role of the neutron upscattering phenomenon on the triple-alpha process in a multi-step process.
DOI: 10.1038/s41586-020-2948-7
发表时间: 2020-12-03
期刊: NATURE
影响因子: 64.8
作者:
Jin, Shilun;Roberts, Luke F.;Schatz, Hendrik
通讯作者: Schatz, Hendrik
影响因子: 1.4
作者:
Bishop, J.;Rogachev, G. V.;Upadhyayula, S.
通讯作者: Upadhyayula, S.
DOI: 10.1103/physrev.160.1193
发表时间: 1967-01-01
期刊: PHYSICAL REVIEW
影响因子: --
作者:
SHAW, PB;CLAYTON, DD
通讯作者: CLAYTON, DD
影响因子: 1.4
作者:
Koshchiy, E.;Rogachev, G., V;Upadhyayula, S.
通讯作者: Upadhyayula, S.
DOI: 10.1016/j.nds.2018.02.001
发表时间: 2018-02-01
影响因子: 3.7
作者:
Brown, D. A.;Chadwick, M. B.;Zhu, Y.
通讯作者: Zhu, Y.