THE EMISSION OF SHORT RANGE ALPHA PARTICLES FROM LIGHT ELEMENTS UNDER PROTON BOMBARDMENT. IV. THE REACTION $sup 19$F(p/cap alpha/)$sup 16$O

Summary The short range alpha particles emitted in the proton bombardment of fluorine have been examined with a magnetic analyser for proton energies from 300 to 950 keV. In the 19F(pα, γ)16O reaction three alpha particle groups have been measured, the average values of the energy releases being Q1=1·979±0·009, Q2=1·200±0·010 and Q3=0·996±0·010 MeV. ; the resonances for all three groups appear to be the same. The relative intensities of the groups at six resonances have been calculated. Angular distribution measurements indicate that there are no large departures from isotropy in the cases examined. Energy measurements of the alpha particles associated with pair emission in the 19F(pα, π)16O reaction give a value for the energy release of 2·056±0·012 MeV.

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