DECAY OF 6.18-MEV JPI=O+ LEVEL OF BE10

The reaction Be9(d,p)Be10 (at Ed=3.25 MeV) has been used to investigate the decay of the 6.18-MeV =0+ level of Be10. Both of the -ray transitions 6.185.96 and 6.183.37 have been observed by means of - coincidence experiments using Ge(Li) and NaI(Tl) detectors. The mean life of the 6.18-MeV state is found to be 1.1-0.3+0.4 psec from a Doppler-shift measurement on the 6.185.96 transition. It is concluded that the 6.185.96 transition takes place mainly to the J=1- component of the J=(1-, 2+) 5.96-MeV doublet and has an energy of 219.40.3 keV. The intensities of proton groups leading to levels of Be10 in the (d, p) reaction at Ed=3.25 MeV were determined with a Buechner spectrograph By combining the present results with previous measurements on the 6.18-MeV E0 ground-state transition, the branching ratios (in%) from the 6.18-MeV state to the states at 5.96 MeV (J=1-), 3.37 MeV (J=2+), and 0 MeV (J=0+) are found to be 4.61.5, 952, and 0.240.08, respectively. The significance of these results is discussed. Incidental results are a value of 169.250.04 keV for the C13 3.853.68 transition and a meanlife of 2.00.6 psec for the B10 2.15-MeV level. © 1969 The American Physical Society.