/* 2002-03-18 N.OTUKA: 10 POINTS CHECK */ /* 2005-04-19 N.OTUKA: PREEQUI in ANL replaced by PREEQUI-MODEL */ /* 2007-03-05 N.OTUKA: INST-ATH corrected */ \\BIB,1; D#=D341; TITLE=/PREEQUILIBRIUM ALPHA-EMISSION IN THE 197AU(P,ALPHA,X)-REACTION AT EP=72MEV/; PURPOSE=/TO COMPARE THE SPECTRAL DISTRIBUTION OF ALPHA-PARTICLES EMITTED AFTER THE ABSORPTION OF A STOPPED PION WITH THE ANGLE-INTEGRATED CROSS SECTION OF A (P,ALPHA,X)-REACTION AT A PROTON ENERGY OF ABOUT 70 MEV IN THE FRA MEWORK OF A PREEQUILIBRIUM MODEL./; /*@3@*/ ATH=(Z.LEWANDOWSKI'1',E.LOEFFLER'1',R.WAGNER'1',H.H.MUELLER'2', W.REICHART'2',P.SCHOBER'2',H.JASICEK'3',P.RIEHS'3'); INST-ATH=(2SWTBAS'1',2SWTZUR'2',2AUSATI'3'); REF=PL/B; VLP=80(1979)350; RCTS=(197AU(P,ALPHA,X)); \\EXP,1; RCT=197AU(P,ALPHA,X); POL-TGT=NO; ACC=(CYC); INST-ACC=2SWTVIL; INC-ENGY-LAB-RANGE=(72.3MEV); POL-PRJ=NO; DET-PARTCL=(ALPHA); DET-SYS=(MAG,SI,CNTR-TLSCP); ERS-DET=XKEV; ANL=(PREEQUI-MODEL'1'); /*@6@*/ PHQ=(ENGY-SPEC'2',DSIGMA/DE,X'1',X'2'); /*@7@*/ /*@9@*/ /*@12@*/ \\DATA,1; CMPD=198HG; THTL=XDEG'1'; /*@8@*/ /*FIG.1*/ /* D341 FIG.1 */ /* SER#= 1 */ /* XSCALE=LINEAR YSCALE=LOG */ /* XMAX= 6.00000000E+01 YMAX= 1.00000000E+03 */ /* XMIN= 2.00000000E+01 YMIN= 1.00000000E+00 */ /* FOLLOWING DATA ARE TAKEN FROM GRAPH */ \DATA; ENGY-CM DSIGMA/DE (MEV) (UB/MEV) 23.89 2.29E+03 27.77 1.53E+03 31.94 1.12E+03 35.83 8.32E+02 39.72 5.75E+02 43.98 4.29E+02 47.77 3.08E+02 51.94 2.29E+02 56.11 1.56E+02 60.00 1.16E+02 64.08 8.02E+01 68.06 5.25E+01 71.94 3.13E+01 \END; /*@10@*/ /*@11@*/ /*@13@*/ \\END; @@3; THE AUTHORS HAVE SHOWN THAT FOR THE 72 MEV-PROTON AND STOPPED PION INDU CED ALPHA EMISSION, THE SHAPES OF THE EXPERIMENTAL ALPHA-SPECTRA ARE VE RY SIMILAR AND THE PREFORMATION FACTORS OBTAINED FROM AN EXCITON MODEL ANALYSIS ARE IN EXCELLENT AGREEMENT. @@6; '1' AN EXCITON MODEL IN MONTE-CARLO CALCULATION @@7; '1' X=ALPHA-PREFORMATION FACTOR=0.045+-0.010. @@8; '1' X:THE ANGLE INTEGRATION IS CARRIED OUT OVER 13 ANGLES FROM 20 TO 15 0 DEGREES. @@9; '2' ANGLE-INTEGRATED ALPHA-SPECTRUM @@10; THE ABSOLUTE ERRORS ARE ESTIMATED TO LIE BETWEEN 20 AND 25%, WITH THE S TATISTICAL ERRORS LESS THAN 10% IN THE GIVEN ENERGY RANGE. @@11; '1' EMITTED ALPHA PARTICLE @@12; '3'X: THE AUTHORS HAVE ALSO MEASURED THE 3HE-SPECTRA OF THE 59CO(P,3HE, X) - AND 197AU(P,3HE,X)-REACTIONS AT A PROTON ENERGY OF 72 MEV. @@13; THE ANGLE-INTEGRATED ALPHA SPECTRUM IS DISPAYED IN CONTINUOUS LINE IN FIG.1 IN THE PAPER. THE PRESENT DATA SAMPLING IS CARRIED OUT EVERY 4 ME V FROM ENGY-CM=20 TO 72. @@;