Isotope effect in retention value between 55Cr and 51Cr in recoil chemistry of Cr(acac)3

Recoiling behaviour of 55Cr produced by 54Cr(n,γ)55Cr reaction was studied by choosing solid Cr(acac)3 or its benzene solution as target material and by using rapid separation technique. The approximate retention value ('R-value') of 55Cr, defined as the percentage of the activity retained in the benzene phase which was not extracted with an oxalic acid solution, was found to be higher than that of 55Cr for practically all experimental runs tested (15 runs). The 55Cr/51Cr ratio was 1.115+-0.027. (author)