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희귀 핵 연구단
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Neutron-upscattering enhancement of the triple-alpha process

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Title
Neutron-upscattering enhancement of the triple-alpha process
Author(s)
Bishop, J.; Parker, C.E.; Rogachev, G.V.; Sunghoon Ahn; Koshchiy, E.; Brandenburg, K.; Brune, C.R.; Charity, R.J.; Derkin, J.; Dronchi, N.; Hamad, G.; Jones-Alberty, Y.; Kokalova, Tz.; Massey, T.N.; Meisel, Z.; Ohstrom, E.V.; Paneru, S.N.; Pollacco, E.C.; Saxena, M.; Singh, N.; Smith, R.; Sobotka, L.G.; Soltesz, D.; Subedi, S.K.; Voinov, A.V.; Warren, J.; Wheldon, C.
Publication Date
2022-04
Journal
Nature Communications, v.13, no.1
Publisher
Nature Research
Abstract
© 2022, The Author(s).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).
URI
https://pr.ibs.re.kr/handle/8788114/11968
DOI
10.1038/s41467-022-29848-7
ISSN
2041-1723
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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