Measurement of the H2(n,γ)H3 reaction cross section between 10 and 550 keV

Details Measurement of the H2(n,γ)H3 reaction cross section between 10 and 550 keV Measurement of the H2(n,γ)H3 reaction cross section between 10 and 550 keV

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..74b5804n&link_type=abstract

Physical Review C, vol. 74, Issue 2, id. 025804

Astronomy and Astrophysics

Astrophysics

4

Nuclear Reactions Involving Few-Nucleon Systems, Radiative Capture, Nuclear Matter Aspects Of Neutron Stars, Big Bang Nucleosynthesis

Scientific paper

We have measured for the first time the cross section of the H2(n,γ)H3 reaction at an energy relevant to big-bang nucleosynthesis by employing a prompt discrete γ-ray detection method. The outgoing photons have been detected by means of anti-Compton NaI(Tl) spectrometers with a large signal-to-noise ratio. The resulting cross sections are 2.23±0.34,1.99±0.25, and 3.76±0.41μb at En=30.5,54.2, and 531 keV, respectively. At En=30.5 keV the cross section differs from the value reported previously by a factor of 2. Based on the present data the reaction rate has been obtained for temperatures in the range 107-1010 K. The astrophysical impact of the present result is discussed. The obtained cross sections are compared with a theoretical calculation based on the Faddeev approach, which includes meson exchange currents as well as a three-nucleon force.

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