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Abstract. The total cross section of the capture reaction 2H(n, t)'y has been measured at En = 25 MeV using a deuterium gas target and a scintillation counter telescope. The resulting value o = (7.6 + 0.8)/~b is compared with existing photodisintegration data and theoretical calculations.Photodisintegration of 3H and 3He connects the initial ground state of a bound three-nucleon system with the final three-body continuum state and is thus a tool to investigate the three-body wave function in its more general aspect. The twobody photodisintegration of 3He and its inverse, radiative p-d capture, have been studied both experimentally and theoretically mainly in the low-energy region co ~< 35 MeV.

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The neutron-proton capture reaction has been measured at E, = 25.6 MeV.From the data the total and the differential cross section at 0" were determined. The results are compared with photodisintegration data and theoretical calculations and found to be in agreement with both.