INDC(IND)-35G - IAEA Nuclear Data Services

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Cumulative yields cf rare-earth tpufxm product* to the spontaneous fission
of
B.S. Toaar, H. HaJk, A. Xamaawaa/, Satjya Prakash and M.Y. Ramanlah
In view of Hit paucity of data on the MM yields of short lived xare-
earth fission products, -the present .study ,mi aiaed at d«ter«inir« tii«
cuaalatl-v* yi«ld» of aaiuljr ahozt llvad xmxa ea^Hfa laotopas in »pontaneou«
252
ftoaion of Cf.
Piaaion pacodnst* fro» a -v 3/% 252 Cf •ouzo* Mit colleoted OP 1 mil
alualaiua cateh«x foils. HM csllvction tiat was rartod depanding oa Hi* half
life of 1he isotops under study. Ib catcher foils were dissolved in dil HC1
in presence of lanthanua carrier. Baxe earlfas were separated ty fast erne
step fluoride and hydroxide precipitation and -this precipitate was dissolved
in 5 «1 dil HC1 and counted. The oountinf was done on a pxecalibrated G9£ HPGe
detector, (having a xesolutlon of 1.8 Kiev at 1332 Kev) coupled to a 4096
channel analyser.
the gaant ray peak areas wexe corxeoted for absolute disintegration
rate hy using gaasa ray abundance^ 1 ' and detector efficiency. The yields of
xaxe-eartbs Isotopes were determined relative to the yield of * Oe^ ' and
axe shown In table 1 alongwiih 1fae litezatuze. values®~J', The pxesent
yield values axe in good agreement with the literature data except la case
of 15 Vd. the fission yield of * 5 Ce is determined for the fixst tine. The
laxge difference between enr value and the literature value for W could
be plausibly due to fee laxge variation In gamna ray abundance value* taken
for yield calculation.
References
1. J. Blachot and Ch. *iohe. Annals He Ihysique &, 3 (1981).