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Phys. Rev. C 60, 015801 (1999) [8 pages]

Total cross section of the 3H(p,n)3He reaction from threshold to 4.5 MeV

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C. R. Brune *, K. I. Hahn †, R. W. Kavanagh, and P. R. Wrean ‡
W. K. Kellogg Radiation Laboratory, 106-38, California Institute of Technology, Pasadena, California 91125

Received 22 February 1999; published 16 June 1999

We report new measurements of the total cross section for the 3H(p,n)3He reaction from threshold (Ep=1.02 MeV) to Ep=4.5 MeV. The experiment utilized specially prepared Ti-3H targets, and neutrons were detected using a 4π detector. A weak resonant structure due to an excited state in 4He is observed which was not seen in previous cross section measurements. A new expression for the 3He(n,p)3H thermonuclear reaction rate for temperatures below 10 GK is presented which will allow for more accurate calculations of the yields of light elements produced by big-bang nucleosynthesis.


©1999 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.60.015801
DOI: 10.1103/PhysRevC.60.015801
PACS: 26.35.+c, 25.10.+s, 28.20.-v, 98.80.Ft

* Present address: University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255 and Triangle Universities Nuclear Laboratory, Durham, NC 27708-0308.
† Present address: Department of Science Education, Ewha Women’s University, Seoul 120-750, Korea.
‡ Present address: TRIUMF, Vancouver, BC, Canada V6T 2A3.

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