Study of 14N(γ,np)3α Reaction for Eγ up to 150 MeV
The reaction 14N(g,np)3a induced by bremsstrahlung photons of endpoint energy Egmax = 150 MeV has been investigated using diffusion chamber, which is placed into the magnetic field. The distribution functions of the reaction yield, the energy and momentum of the final particles from Еg were measured and it was determined that at Еg > 45 MeV, change in the behavior of these functions occurs. The average energy Taver was calculated for the particles with the energy falling within a 1 MeV interval of the total kinetic energy T0 = Eg ‑ Q, where Q is the energy threshold of the reaction (Q = 19.77 MeV). At T0 ~ 20 MeV, the dependence of the contributions from Taver to T0 changes sharply. At T0 > 20 MeV, most of the energy is carried away by nucleons, their relative contribution is equal, and this agrees with the assumption of the quasideuteron interaction mechanism. The momentum distribution distributions for the neutron and proton have a similar form, with a strong shift of the maximum towards higher energies with an increase in the energy of the γ quantum. For a system of 3α‑particles, in each distribution, peak is observed centered at 100 MeV/c, the relative contribution of which smoothly decreases with increasing momentum, and a wide high-energy "tail" appears. The energy and angular correlations of the np‑pair depends on both of the energy Еg and the momentum of the system of 3α‑particles.
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