Photoprotons from Tantalum

Abstract

Photoproton emission from tantalum has been studied by measuring the yield of the 5�5 hr isomer of 180Hf produced in the 181Ta(y,p)180mHf reaction. The experimental arrangements were similar to those used in a previous investigation (Oarver and Turchinetz 1958) of the photodisintegration of tantalum, except that the shielding of the scintillation counter, a It in. diameter by 2 in. long NaI(Tl) crystal, has now been improved along the lines described by Pringle, Hollander, and Seaborg 1958}