Photoneutron Production Excitation Functions to 320 Mev

Jones, Lawrence W.; Terwilliger, Kent M.

doi:10.1103/PhysRev.91.699

Photoneutron Production Excitation Functions to 320 Mev

Lawrence W. Jones
(
- UC, Berkeley
)
,
Kent M. Terwilliger
(
- UC, Berkeley
)

Aug 1, 1953

8 pages

Published in:

Phys.Rev. 91 (1953) 699-707

DOI:

10.1103/PhysRev.91.699

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Abstract: (APS)

Photoneutron yields from eleven elements were obtained from bremsstrahlung of maximum energy 13.5 to 320 Mev with the reaction, Cu63(γ, n)Cu62, as a monitor. The yield data were analyzed by a photon difference method to give the excitation functions for photoneutron production. Most of these excitation functions showed the typical resonance shape in the 20-Mev region, a low but finite "tail" to about 80 Mev and a large rise from there to 320 Mev. With the use of a calculated neutron multiplicity ∫080σdE for tantalum was found to be 5.1 Mev-barns, somewhat higher than ∫0∞σdE predicted by Levinger and Bethe for the electric dipole interaction. The rise above 80 Mev is probably due to mesonic interactions. At the meson threshold, with data for the neutron multiplicity from π− absorption, the photon absorption cross section was found to obey the relation, σ=0.32A1.3×10−28 cm2.

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(
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)
,
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(
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)
,
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(
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