GAMMA-RAY WIDTHS OF 3.00-MEV LEVEL OF AL27 AND 3.13-MEV LEVEL OF P31

Nuclear resonant scattering of bremsstrahlung by the 3.00-MeV level of Al27 has been observed. From comparison with resonant scattering by the 2.98-MeV level of Al27, and with the branching taken from the literature as 0=0.87, widths 0=5.31.0 meV and =6.11.2 meV are obtained. These values are in some disagreement with inelastic electron scattering results. Comparison with Doppler-shift values tends to verify spin=92 for the 3.00-MeV level and to rule out spin=32. Self-absorption measurements of the resonant scattering by the 2.21- and 2.98-MeV levels of Al27 give =17.6-3.3+2.9 meV and =125-13+14 meV, in agreement with previous results. Self-absorption measurements for the 3.13-MeV level of P31 give =66.37 meV. © 1968 The American Physical Society.