-3-
UCRL-5087
FURTHER RADICCHEMICAL STUDIES OF THE HIGH-ENERCGY
FISSICN PRODUCTS
P.C. Stevenson,
H. G. Hicks,
W. E, Nervik, and D. R. Nethaway
University of California Radiation Laboratory
Livern:ore Site
January 13,
I
lyss
INTRODUCTION
Previcus studies!’ c orthe high-energy charged-particle tiss.on of
yr? did not include exan.ination or the yields of n.asses greater than 140.
Formation cross sections o: several care-easth nuclides (A = 140 to 157),
vy 30
91
Le
79
. 14
y?
,
y?
,
¥
3
Mo”
2
and Ba
v have oeen measured in the present work.
Proton energies ranze .ron. 10 to 540 Mev;
deuteron energies,
irom 20 to
130 Mev.
Il.
EAPERIMENTAL TECHNICUES
Preparation of targets” and borm.barament techniques! have been
described previously dy some of the authors.
Was monitored using the reactions
The cyclotron beamintensity
Al (p, Son)Na@4 (79 to 340 Mev}
or
aie (a, ap)Na“? (28 to iGO Mev} in aluminum toils surrounding the targets,
as described sreviously;)? 2,3 the published cross sections of Hicks,
stevenson,
and Ne rVax’ and ol Batzei,
Crane,
and O™ell, *
were used,
Beam intensities were measured by means o1 a Faraday cu, when bonibardments were made using i0- end 32-Mev protons and 20-Mev deuterons.
.
.
9Y
.
Radiochemical determination of Mo’’ was pertormed in the manner
described by Gunnet al.,
Ll.
.
_
H. G. Hicks,
Phys. Rev.
i00,
P.
and the rr.etnhod of isolation and separation ot
<
C. Stevenson,
-
-
1le&¢ (1352),
>
“H, G. Hicks and «. S. Gilbert, Phys. Rev. 100, 1286 (1935).
Hic«s, Stevenson,
and Né.vix,
Phys. ev.
102,
1390 (1526).
:
iatzei, Crane and UlKeily, Phys, Rev. fi, 9349 (1% 33}.
rai
500 ! gygen
Hicas,
Stevenso::,
.
Levy, Phys. Rev. 197, 1642 (1997).
7
J?
.
R. S. Gilbert, and W. H. Hutchin,