/*===================================================================*/ /* NRDF D1792 Data No.1 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,1; D#=D1792; TITLE=/ Isomeric yield ratios of 134I and 136I in the proton-, 12C- and 19F-induced fission of 235U, 237Np and 238U /; PURPOSE=/ In this experiment, in order to obtain the isomeric yield ratios of 134(m)I/134(g)I and 136(m)I/136(g)I, short-lived nuclides of iodine produced by the proton-, 12C- and 19F-induced fission of 235U, 237Np and 238U were investigated by a radiochemical method. /; ATH=(N.SHINOHARA'1', K.TSUKADA'1', S.ICHIKAWA'1', M.MAGARA'1', Y.HATSUKAWA'1'); INST-ATH=(2JPNJAE'1'); REF=RCA; VLP=88(2000)1; RCTS=(235U(P,FISSN)134I, 235U(P,FISSN)136I, 237NP(P,FISSN)134I, 237NP(P,FISSN)136I, 238U(P,FISSN)134I, 238U(P,FISSN)136I, 235U(12C,FISSN)134I, 235U(12C,FISSN)136I, 237NP(12C,FISSN)134I, 237NP(12C,FISSN)136I, 238U(12C,FISSN)134I, 238U(12C,FISSN)136I, 235U(19F,FISSN)134I, 235U(19F,FISSN)136I, 237NP(19F,FISSN)134I, 237NP(19F,FISSN)136I, 238U(19F,FISSN)134I, 238U(19F,FISSN)136I); PHQS=FISSN-YLD; /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,1; /* 2004-03-19 : Compiled */ RTY=FISSN; PHQ=FISSN-YLD; CHM=ELM'2'; /* '2' Chemical purities are 97.7 atom% (235U), 99.3 atom% (238U) and 100 atom% (237Np). */ PHYS-FORM=SLD; BAC=X; POL-TGT=0%; ALGN-TGT=0%; ACC=VDGT; INST-ACC=2JPNJAE; POL-PRJ=0%; COINC=NO; ANT-COINC=NO; DET-SYS=HPGE'3'; /* '3' Coaxial HPGe detector and multichannel analyzer were used to measure gamma-rays from the iodine nuclides. The detector resolution of HPGe detector is 1.73keV (FWHM) at 1.33-MeV gamma-ray. */ /* Experimental Method: - Collection by He jet (KCl/He gas-jet recoil-transport system (HJRT) [K. Tsukada et al., Radiochim. Acta 51, 77 (1990)]) - Chemical separation (Continuous multistage solvent extraction system SISAK (Short-lived Isotopes Studied by AKUFVE technique [G. Skarnemark et al., Phys. Scr. 34, 597 (1986)]) - Gamma ray spectrometry /* Analysis: - The spin-dependent statistical model (D.G. Madland et al., Nucl. Sci. Engl. 64, 859 (1977)) was used to deduce the angular momenta of the initial fragments. RCT=235U(P,FISSN)134I; THK-TGT=2.7MG/CM**2; INC-ENGY-LAB=14MEV; BEAM-INTNSTY=800NA; DET-PARTCL=(GAMMA'4',GAMMA'5'); /* '4' Delayed gamma from 134I (ground state) */ /* '5' Delayed gamma from 134I (metastable state) */ /* Derived angular momentum of initial fragment is 11.2+-0.6. */ /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,1; INC-ENGY-LAB=14MEV; ENGY-GAMMA=(847.025KEV'6',271.9KEV'7'); INTNSTY-GAMMA=(0.954'6',0.79'7'); HALF-LIFE=(52.6MIN'6',3.69MIN'7'); /* '6' Delayed gamma from 134I (ground state) */ /* '7' Delayed gamma from 134I (metastable state) */ CMPD=236NP; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; XSECTN-RATIO'8' DELTA-XSECTN-RATIO'8' DATA1'9' (NODIM) (NODIM) (MEV) 2.08 +-0.27 19 \END; /*===================================================================*/ |