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Gamma Rays from Neutron Capture in Helium-3 and Deuteron Capture in Deuterium

Oct 15, 1963
3 pages
Published in:
  • Phys.Rev. 132 (1963) 751-754
DOI:
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Abstract: (APS)
The gamma rays from the He3(n, γ)He4 and the D(d, γ)He4 reaction have been observed. The gamma detector, a 3-in.×4-in. NaI crystal, was surrounded by a plastic scintillator to eliminate the cosmic-ray background. A pileup rejection circuit was used to reduce the background from neutron induced reactions in the NaI. The cross section of the He3(n, γ)He4 reaction at 4 MeV is σ=5 μb/sr at 90°. The intensity ratio, I(90°I(45°)≈2, agrees with that expected for electric dipole radiation (ΔM=0). The D(d, γ)He4 reaction at 1.35 MeV has a cross section σ=2×10−33 cm2/sr at 45°.