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/* NRDF D1850 Data No.14 */
/*===================================================================*/
/* Bibliography */
/*===================================================================*/
\\BIB,14;
D#=D1850;
TITLE=/Highly asymmetric mass division in low-energy proton-induced
fission of 232Th and 244Pu/;
PURPOSE=/To study the general trend of the yields of highly asymmetric
mass division process in the low energy fission of actinides/;
ATH=(K.TSUKADA'1', N.SHINOHARA'1', I.NISHINAKA'1', S.ICHIKAWA'1',
Y.NAGAME'1', K.SUEKI'2', T.KOBAYASHI'2', H.NAKAHARA'2',
M.TANIKAWA'3', T.OHTSUKI'3');
INST-ATH=(2JPNJAE'1', 2JPNTMU'2', 2JPNTOK'3', 2JPNTOH'4');
/* '1' Department of Radioisotopes */
/* '2' Department of Chemistry */
/* '3' Department of Chemistry */
/* '4' Laboratory of Nuclear Science */
REF=RCA;
VLP=76(1997)173;
RCTS=(232TH(P,FISSN)142LA, 232TH(P,FISSN)143LA, 232TH(P,FISSN)143CE,
232TH(P,FISSN)146CE, 232TH(P,FISSN)146PR, 232TH(P,FISSN)147PR,
232TH(P,FISSN)149ND, 232TH(P,FISSN)150PM, 232TH(P,FISSN)151ND,
232TH(P,FISSN)151PM, 232TH(P,FISSN)152ND, 232TH(P,FISSN)153SM,
232TH(P,FISSN)155SM, 232TH(P,FISSN)156SM, 232TH(P,FISSN)157EU,
244PU(P,FISSN)142LA, 244PU(P,FISSN)143LA, 244PU(P,FISSN)146CE,
244PU(P,FISSN)147PR, 244PU(P,FISSN)149ND, 244PU(P,FISSN)151ND,
244PU(P,FISSN)152ND, 244PU(P,FISSN)153SM, 244PU(P,FISSN)155SM,
244PU(P,FISSN)156SM, 244PU(P,FISSN)157SM, 244PU(P,FISSN)158EU,
244PU(P,FISSN)159EU, 244PU(P,FISSN)162TB, 244PU(P,FISSN)163TB);
PHQS=FISSN-XSECTN;
/*===================================================================*/
/* Experimental Conditions */
/*===================================================================*/
\\EXP,14;
/* 2003-11-01 : Converted, Data converted from EXFOR O0667 */
RTY=FISSN;
PHQ=FISSN-XSECTN;
CHM=ELM'5';
/* '5' Thorium and plutonium nitrate was dissolved in about 5-10
ml 0.05M HNO3 and about 5-8 ml isopropyl alcohol. */
PHYS-FORM=SLD;
BAC=AL;
THK-BAC=5.41GMG/CM**2'6';
/* '6' Targes were prepared by electrodeposition onto a 5.4 mg/cm2
thick aluminum foil. */
POL-TGT=0%;
ALGN-TGT=0%;
ACC=VDGT;
INST-ACC=2JPNJAE;
ERS-PRJ=100[200KEV;
BEAM-INTNSTY=[1.5UA'7';
/* '7' Uncertainty of proton beam intensity was estimated to be
about 6%. */
POL-PRJ=0%;
COINC=NO;
ANT-COINC=NO;
MONTR-RCT=/ 65CU(P,N)65ZN, As proton-energy and beam-current monitors,
10 mg/cm2 thick copper foils were inserted into the down
stream of the target stack. /;
ANL=STATIST-MODEL'8';
/* '8' Gross feature of highly asymmetric mass division would
phenomenologically be explained by statistical considerations
when they are compared in terms of asymmetry parameters. */
/* Experimental Method:
- Activation (Proton bombardments were carried out with incident
energies of 16 and 13 MeV for 10 min to 1 hour.)
- Chemical separation (The whole procedure of the chemical
separation of rare earth elements was accomplished within 20 min
after the end of bombardment. Details of the chemical separation
procedure are given in [S.Usuda, JAERI 1315(1989), S. Usuda, J.
Radioanal. Nucl. Chem. 123(1988)619])
- Gamma ray spectrometry (Produced nuclides were identified
through their characteristic gamma-rays and half-lives.)
RCT=232TH(P,FISSN)156SM;
THK-TGT=0.5MG/CM**2;
DET-PARTCL=GAMMA'74';
/* '74' Delayed gamma (203.8 keV) from 156Sm (Half-life=9.4 hour)
is measured. Abundance of this decay mode is 0.202. */
/*===================================================================*/
/* Descriptive Parameters */
/*===================================================================*/
\\DATA,14;
SYS-ERR=(5%'75',4%'76');
/* '75' Uncertainty in detector efficiencies */
/* '76' Uncertainty in chemical yields */
EMT=GAMMA'77';
/* '77' Delayed Gammas */
RSD=(156SM,65ZN);
/*===================================================================*/
/* Data Table */
/*===================================================================*/
\DATA;
INC-ENGY-LAB XSECTN DELTA-XSECTN'78'
(MEV) (MB) (MB)
9. 0.0087 +-0.003
10. 0.015 +-0.002
11. 0.027 +-0.004
12. 0.041 +-0.013
12.5 0.062 +-0.007
13. 0.072 +-0.027
14. 0.1 +-0.03
15. 0.15 +-0.03
15.9 0.21 +-0.03
\END;
/*===================================================================*/
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