/*===================================================================*/ /* NRDF D1777 Data No.21 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,21; D#=D1777; TITLE=/ Effect of shell structure in the fusion reactions 82Se+134Ba and 82Se+138Ba /; PURPOSE=/ In order to investigate the effect of the nuclear shell structure on the fusion process, we investigated the isotope dependence in the fusion reactions 82Se+134Ba and 82Se+138Ba. /; ATH=(K.SATOU'1,2', H.IKEZOE'1', S.MITSUOKA'1', K.NISHIO'1', S.C.JEONG'3'); INST-ATH=(2JPNJAE'1', 2JPNTSU'2', 2JPNKEK'3'); /* '1' Advanced Science Research Center */ /* '2' Institute of Physics and Tandem Accelerator Center */ /* '3' Institute of Particle and Nuclear Studies */ REF=PR/C; VLP=65(2002)054602; RCTS=(138BA(82SE,N)219TH, 138BA(82SE,X)215RA, 138BA(82SE,2*N)218TH, 138BA(82SE,X)214RA, 138BA(82SE,3*N)217TH, 138BA(82SE,4*N)216TH, 138BA(82SE,5*N)215TH, 138BA(82SE,6*N)214TH, 138BA(82SE,7*N)213TH, 138BA(82SE,X)216AC, 138BA(82SE,X)215AC, 138BA(82SE,X)214AC, 138BA(82SE,X)213AC, 138BA(82SE,X)212AC, 138BA(82SE,X)212RA, 138BA(82SE,X)211RA, 138BA(82SE,X)210RA, 138BA(82SE,X)209RA, 134BA(82SE,N)215TH, 134BA(82SE,2*N)214TH, 134BA(82SE,3*N)213TH, 134BA(82SE,4*N)212TH, 134BA(82SE,5*N)211TH, 134BA(82SE,P)215AC, 134BA(82SE,X)214AC, 134BA(82SE,X)207RA, 134BA(82SE,X)213AC, 134BA(82SE,X)212AC, 134BA(82SE,X)211AC, 134BA(82SE,X)210AC, 134BA(82SE,X)212RA, 134BA(82SE,X)211RA, 134BA(82SE,X)210RA, 134BA(82SE,X)209RA, 134BA(82SE,X)208RA, 138BA(82SE,FUSN), 134BA(82SE,FUSN)); PHQS=(XSECTN'4', X'5'); /* '4' Evaporation residue production cross section */ /* '5' fusion probability */ /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,21; /* 2003-03-12 : Compiled */ CHM=ELM; PHYS-FORM=SLD; BAC=AL; THK-BAC=XMG/CM**2'6'; /* '6' 1.3 micro-meter */ POL-TGT=0%; ALGN-TGT=0%; ACC=VDGT'7'; /* '7' JAERI tandem booster accelerator */ INST-ACC=2JPNJAE; POL-PRJ=0%; COINC=NO; ANT-COINC=NO; DET-SYS=(SI'8',SBD'9',TOF); /* '8' Double sided position-sensitive strip detector (DPSD). The typical energy resolution was 75 keV (FWHM) for alpha-decay energy of 7.921 MeV from 216Th produced in the present reaction. */ /* '9' To measure the elastic scattering events of the 82Se from the barium target, which used to determine the absolute value of the evaporation residue cross sections. */ ANL=(CC'10',STATIST-MODEL'11'); /* '10' Coupled-channel calculation using the code CCDEF [J.O.Fernandez Niello et al., Comput. Phys. Commun. 54(1989)409]. In the calculation of the fusion cross section, the coupling of the inelastic excitations of the first 2+ and 3- states for both the projectile and the target to the fusion process are taken into account. */ /* '11' After the coupled-channel calculation, the survival probability of each evaporation residue is calculated by using the statistical model code HIVAP[W. Reisdorf and M. Schadel, Z. Phys. A343(1992),47] */ /* Experimental Method: - Time-of-flight RCT=(134BA(82SE,X)210RA+134BA(82SE,X)209RA); RTY=SQNTL-RCT'121'; /* '121' Evapolation */ PHQ=XSECTN'122'; /* '122' Evaporation residue production cross section */ ENR=73.5%'123'; /* '123' The contamination of the barium isotopes 135, 1136, 137 and 138 in 134BA target are 15.24%, 4.03%, 1.94% and 5.26%, respectively. */ THK-TGT=0.50MG/CM**2; INC-ENGY-LAB=(214MEV, 221MEV, 232MEV, 235MEV, 239MEV, 240MEV, 245MEV, 249MEV); DET-PARTCL=(ALPHA'127',ALPHA'125',ALPHA'126',ALPHA'124'); /* '127' Alpha from 205Rn */ /* '126' Alpha from 206Rn */ /* '125' Alpha from 209Ra */ /* '124' Alpha from 210Ra */ /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,21; NORM=/ Elastic scattering events of the 82Se beam from the barium target were used to determine the absolute value of the evaporation residue cross sections. /; TOT-ERR=40%; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; INC-ENGY-CM SIGMA DELTA-SIGMA (MEV) (UB) (UB) 214. 0.90 +0.80-0.77 221. 1.7 +0.8-0.7 232. 1.6 +0.7-0.7 235. 1.0 +0.6-0.5 239. 1.0 +0.5-0.5 240. 0.70 +0.40-0.36 245. 0.80 +0.40-0.37 249. 0.79 +0.32-0.32 \END; /*===================================================================*/ |