Total Neutron Yields from Light Elements under Proton and Alpha Bombardment

/sup 3/H(p,n)/sup 3/He differential cross sections below 5 MeV and the n-/sup 3/He cross sections. [2. 5 and 4. 0 MeV]

“…The curve of the total reaction cross section ( Fig. 1) was established by the (relative) data of Gibbons et al, 7 the data normalized to long counters, 89 and the individual data depending on the total n- 3 He cross sections.' 012 The individual data include both 3 He(n,p) 3 H data measured as a fraction of the n- 3 He cross section 10 " (and converted by detailed balance to the p-3 H system) and data derived from the total n- 3 He cross section by subtraction of the integrated elastic n- 3 He cross section. "…”

Estimating reaction rates and uncertainties for primordial nucleosynthesis

“…This may not be the ideal choice, since the curve has a very large second derivative just above threshold. We fit data for 7 Li(n, p) 7 Be from Sekharan et al [79], Taschek and Hemmendinger [80], and Gibbons and Macklin [49], which extend from threshold to well past the lowest-energy resonance. We also cut off these data sets at about 700 keV above threshold (where they no longer affect BBN yields), so that only data in the critical range affect the χ 2 calculations.…”

“…[45][46][47][48]) and reverse (Ref. [17,49]) processes. We used reverse data that had been converted to forward cross sections through exact detailed balance relations, along with direct data.…”

ENERGY SPECTRA OF NEUTRONS AND GAMMA RAYS FROM SPONTANEOUS FISSION OF $sup 244$Cm

“…The spectrum of spontaneous fission neutrons from 244 Cm was measured with the 5 He neutron spectrometer and associated electronic equipment described in the Appendix, which also contains details of the instrument checkout and calibration.…”