/*===================================================================*/ /* NRDF D1888 Data No.2 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,2; D#=D1888; TITLE=/ alpha-decays of neutron-deficient americium isotopes /; PURPOSE=/ To present new and improved data on the alpha-decay of 233Am, 234Am, 235Am, 236Am, and 229Np (alpha-decay daughter of 233Am) /; ATH=(M.SAKAMA'1', M.ASAI'2', K.TSUKADA'2', S.ICHIKAWA'2', I.NISHINAKA'2', Y.NAGAME'2', H.HABA'3', S.GOTO'4', M.SHIBATA'5', K.KAWADE'6', Y.KOJIMA'7', Y.OURA'8', M.EBIHARA'8', H.NAKAHARA'8'); INST-ATH=(2JPNTKS'1', 2JPNJAE'2', 2JPNIPC'3', 2JPNNII'4', 2JPNNAG'5', 2JPNNAG'6', 2JPNHIR'7', 2JPNTMU'8'); /* '1' Department of Radiologic Science and Engineering, School of Health Sciences */ /* '2' Advanced Science Research Center */ /* '3' Cyclotron Center */ /* '4' Department of Chemistry */ /* '5' Radioisotope Research Center */ /* '6' Department of Energy Engineering and Science */ /* '7' Graduate School of Engineering */ /* '8' Department of Chemistry */ REF=PR/C; VLP=69(2004)014308; RCTS=(235U(6LI,5*N)236AM, 233U(6LI,4*N)235AM, 233U(6LI,5*N)234AM, 233U(6LI,6*N)233AM); PHQS=XSECTN; /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,2; /* 2004-04-14 : Compiled, Kc + On */ PHQ=XSECTN; ENR=X%; CHM=X'9'; /* '9' UO2(NO3)2 */ BAC=AL'10'; /* '10' UO2(NO3)2 in 2-propanol is electrodeposited onto aluminum backing foil. */ THK-BAC=0.9MG/CM**2; POL-TGT=0%; ALGN-TGT=0%; ACC=VDGT; INST-ACC=2JPNJAE; BEAM-INTNSTY=250[340PNA; POL-PRJ=0%; ANT-COINC=NO; DET-SYS=(SI'11',GE(LI)'12'); /* '11' To measure alpha particles with efficiency of 85%. Energy resolution is about 45 keV. */ /* '12' To measure X rays following EC decay. Coaxial type. FWHM= 0.66 keV at 122 keV gamma-ray. */ /* Experimental Method: - Stacked target irradiation (A stack of 21 targets set in a multiple-target chamber with 5 mm spacing) - Collection by He jet (Products attached to the PbI2 aerosol clusters were swept out of the target chamber) - On-line mass separation (JAERI-ISOL. Mass resolution of A/Delta A is about 850 at the mass number A=208 [S. Ichikawa et al., Nucl. Instrum. Methods B187(2002)548].) /* Analysis: - Decay curve analysis /* Related references - J.Guo et al., ZP/A, 355(1996)111. Reference with which data agress (Half-life of 235Am is 15+-5 min in this work.) RCT=233U(6LI,4*N)235AM; THK-TGT=0.05[0.13MG/CM**2; INC-ENGY-LAB=34[42MEV; DET-PARTCL=(ALPHA'15',XRAY'16'); /* '15' Alpha from 235Am. Decay data in present experiment. T1/2= 10.7+-0.7 min and intensity I=(4.0+-0.5)e-3. */ /* '16' X-ray from 235Am. Decay data in present experiment. T1/2= 9.5+-1.2 min. */ COINC=X'17'; /* '17' No alpha-gamma coincidence event was observed. */ DET-SYS=GE'18'; /* '18' Used for alpha-gamma and gamma-gamma coincidence measurements. */ /* Comment to data: Comment by authors: No alpha-gamma coincidence event was observed. This result suggests that the level fed by the 6457 keV alpha transition is either the ground state of 231Np or a low lying level that decays via internal conversion. */ /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,2; RSD=235AM; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; XSECTN DELTA-XSECTN (UB) (UB) 31 +-12 \END; /*===================================================================*/ |