7-LI(N,N')NN7LI N (478) NEUTRON ANGULAR DISTRIBUTION DERIVED FROM DOPPLER - BROADENED GAMMA ENERGY DISTRIBUTIONS
Doppler-broadened gamma energy distributions from the decay of the 1st excited state of 7-Li (478 keV, 73 fs, **-) have been determined for primary neutron energies between 4 and 10 MeV in steps of 0.5 MeV and for gamma observation angles between 45 degrees and 135 degrees in steps of 22.5 degrees . The observed width is about 10 times the resolution of the Ge-detector. Position and shape are determined by the energy - and angle - distribution of the excited 7-Li recoils. The short half-life ensures that energy loss of the recoils before gamma emission is small and can be treated as correction. The angular distributions of the reaction in terms of C.M.-Legendre coefficients are deduced by applying a combination of Monte-Carlo calculations and least-squares fitting. The highest primary neutron energy where ground and first excited state are still separated by TOF in a neutron scattering experiment is approximately equal 5 MeV. There is perfect agreement at this energy between scattering results and the results obtained by Doppler shift analysis. Comparisons with theoretical prediction are discussed.
Bibliographic Reference: INTERNATIONAL CONFERENCE FAST NEUTRON PHYSICS, DUBROVNIK (YUGOSLAVIA), MAY 26-31, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32741 ORA
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Record Number: 1989125079200 / Last updated on: 1987-12-01
Available languages: en