/* 2002-03-18 N.OTUKA: 10 POINTS CHECK */ /* 2005-11-01 N.OTUKA: DATA 1,2,4 INTNSTY -> INTNSTY-GAMMA */ \\BIB,1[5; D#=D1106; TITLE=/DOUBLE GAMMA DECAY IN 40CA AND 90ZR/; ATH=(J.SCHIRMER'1',D.HABS'1',R.KROTH'1',N.KWONG'1',D.SCHWALM'1', M.ZIRNBAUER'1',C.BROUDE'2'); INST-ATH=(2GERMPH'1',3ISLWZI'2'); REF=PRL; VLP=53(1984)1897; RCTS=(40CA(P,P,2*GAMMA)40CA,90ZR(P,P,2*GAMMA)90ZR); PHQS=(ANGL-DSTRN,WDTH-RATIO); \\EXP,1[5; RTY=(INEL-SCATT); ACC=(VDG); INST-ACC=2GERMPH; DET-PARTCL=(GAMMA,P); COINC=(GAMMA,GAMMA,P); DET-SYS=(SSD,NAI); SOLID-ANGL=XMSR'3'; /*@2@*/ ANL=(ANG-CORRL); PHQ=(ANGL-DSTRN,WDTH-RATIO); \\EXP,1[3; RCT=40CA(P,P,2*GAMMA)40CA; ENR=99.97%; CHM=ELM; PHYS-FORM=SLD; THK-TGT=0.3MG/CM**2; BAC=SELF; POL-TGT=NO; ALGN-TGT=NO; INC-ENGY-LAB=(5.08MEV); \\DATA,1; INC-ENGY-LAB=5.08MEV; RSD=40CA; EXC-ENGY=3.35MEV; J-PI=0+; /*@3@*/ /*FIG.1*/ /* D1106 FIG.1 */ /* FOLLOWING DATA ARE TAKEN FROM GRAPH */ \DATA; ENGY-GAMMA'4' INTNSTY-GAMMA DELTA-INTNSTY-GAMMA (KEV) (ARB) (ARB) 73.529 -3.484E-01 +-XXXXXXXXX 242.647 6.969E-01 +-XXXXXXXXX 404.411 6.969E-01 +-XXXXXXXXX 566.176 9.756E+00 +-0.453E+01 713.235 7.317E+00 +-0.244E+01 875.000 2.230E+01 +-0.453E+01 1044.120 2.718E+01 +-0.523E+01 1205.880 4.530E+01 +-0.697E+01 1382.350 6.202E+01 +-0.871E+01 1522.060 6.237E+01 +-0.801E+01 1676.470 8.084E+01 +-0.906E+01 1845.590 9.686E+01 +-0.976E+01 2000.000 6.341E+01 +-0.801E+01 2154.410 5.958E+01 +-0.732E+01 2316.180 5.679E+01 +-0.697E+01 2477.940 3.659E+01 +-0.662E+01 2647.060 1.986E+01 +-0.418E+01 2794.120 1.986E+01 +-0.418E+01 2955.880 6.969E+00 +-0.244E+01 3132.350 -3.484E-01 +-XXXXXXXXX 3279.410 3.833E+00 +-0.174E+01 3448.530 -1.045E+00 +-XXXXXXXXX \END; /*@4@*/ \\DATA,2; INC-ENGY-LAB=5.08MEV; EXC-ENGY=3.35MEV; J-PI=0+; /*@5@*/ /*FIG.2-(1)*/ /* D1106 FIG.2-(1) */ /* FOLLOWING DATA ARE TAKEN FROM GRAPH */ \DATA; THTL'5' INTNSTY-GAMMA DELTA-INTNSTY-GAMMA (DEG) (ARB) (ARB) 4.118 -2.156E-02 +-XXXXXXXXX 15.294 -2.156E-02 +-XXXXXXXXX 24.706 1.811E+00 +-0.229E+01 35.294 1.596E+00 +-0.992E+00 45.294 2.156E-01 +-0.453E+00 55.882 6.038E-01 +-0.518E+00 65.882 5.606E-01 +-0.345E+00 75.882 1.725E-01 +-0.216E+00 85.882 5.606E-01 +-0.259E+00 95.882 1.078E-01 +-0.151E+00 106.471 4.528E-01 +-0.216E+00 115.882 3.019E-01 +-0.259E+00 125.882 1.315E+00 +-0.388E+00 136.471 2.156E+00 +-0.431E+00 147.059 4.140E+00 +-0.668E+00 157.059 5.197E+00 +-0.127E+01 167.647 6.297E+00 +-0.863E+00 \END; /*@6@*/ \\DATA,3; INC-ENGY-LAB=5.08MEV; RSD=40CA; EXC-ENGY=3.35MEV; J-PI=0+; \DATA; EXC-ENGY J-PI ANG-CORRL'6' DELTA-ANG-CORRL'6' WDTH-RATIO'7' DELTA-WDTH-RATIO'7' DATA'8' ERR1'8' ERR2'8' (MEV) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) 3.35 0+ 0.07 0.07 4.5*10**(-4) 1.0*10**(-4) 0.43 +0.17 -0.12 \END; /*@7@*/ \\EXP,4,5; RCT=90ZR(P,P,2*GAMMA)90ZR; ENR=97%; CHM=ELM; PHYS-FORM=SLD; THK-TGT=0.7MG/CM**2; BAC=SELF; POL-TGT=NO; ALGN-TGT=NO; INC-ENGY-LAB=(7.08MEV); \\DATA,4; INC-ENGY-LAB=7.08MEV; EXC-ENGY=1.76MEV; J-PI=0+; /*@5@*/ /*FIG.2-(2)*/ /* D1106 FIG.2-(2) */ /* FOLLOWING DATA ARE TAKEN FROM GRAPH */ \DATA; THTL'5' INTNSTY-GAMMA DELTA-INTNSTY-GAMMA (DEG) (ARB) (ARB) 4.294 2.033E-02 +-XXXXXXXXX 15.470 1.766E-02 +-XXXXXXXXX 25.047 9.377E-01 +-0.408E+00 35.566 5.491E-01 +-0.172E+00 44.950 3.967E-01 +-0.150E+00 55.484 9.392E-02 +-XXXXXXXXX 65.499 1.773E-01 +-XXXXXXXXX 75.095 1.205E+00 +-0.214E+00 85.175 1.653E+00 +-0.214E+00 96.382 1.822E+00 +-0.214E+00 105.278 2.227E+00 +-0.279E+00 116.189 4.026E+00 +-0.322E+00 126.046 3.230E+00 +-0.408E+00 136.246 4.343E+00 +-0.408E+00 145.995 2.947E+00 +-0.343E+00 156.052 3.266E+00 +-0.686E+00 165.902 5.709E+00 +-0.643E+00 176.121 3.647E+00 +-0.127E+01 \END; /*@6@*/ \\DATA,5; INC-ENGY-LAB=7.08MEV; RSD=90ZR; EXC-ENGY=1.76MEV; J-PI=0+; \DATA; EXC-ENGY J-PI ANG-CORRL'6' DELTA-ANG-CORRL'6' WDTH-RATIO'7' DELTA-WDTH-RATIO'7' DATA'8' ERR1'8' ERR2'8' (MEV) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) (NODIM) 1.76 0+ -0.24 0.23 1.8*10**(-4) 0.2*10**(-4) 1.9 +0.7 -0.6 \END; /*@7@*/ \\END; @@2; '3' INELASTIC PROTONS WERE DETECTED AT BACKWARD ANGLES IN FOUR SURFACEBARRIER DETECTORS, EACH SUBTENDING A SOLID ANGLE OF 0.17SR. DETAILED INVESTIGATION OF THE 2GAMMA DECAY MODE IN NUCLEI WAS PERFORMED BY USE OF THE 'CRYSTAL BALL' , A 4-PI GAMMA-RAY DETECTOR SYSTEM COMPRISING 162 INDIVIDUAL NAI(TL) MODULES @@3; PROJECTION OF THE CORRELATION BETWEEN THE ENERGY E(GAMM1) OF ONE OF THE TWO GAMMA RAYS AGAINST THEIR RELATIVE ANGLE THETA 12 ON THE ENERGY AXIS, EXCLUDING THE E(GAMMA1)-THETA12 REGION CONTAMINATED BY POSITRON ANNIHILATION IN FLIGHT(PAF) THE GAMMA-RAY SUM ENERGY IS 3.20MEV<=E(GAMMA1)+E(GAMMA2)=<3.5MEV @@4; '4' E(GAMMA1) @@5; DIRECTIONAL CORRELATION OF THE 2*GAMMA DECAY, EXCLUDING THE E(GAMMA1)-THETA12 REGION POLLUTED BY PAF. @@6; '5' THE RELATIVE ANGLE OF THE TWO GAMMA-RAYS @@7; '6' ASYMMETRY RATIO R=W(PSI=90DEG)-W(PSI=0DEG)/(W(PSI=90DEG) +W(PSI=0DEG)), WHERE W(PSI) IS A GAMMA-GAMMA DIRECTIONAL CORRELATION FUNCTION AND PSI DENOTES THE ANGLE BETWEEN THE COMPTON SCATTERING PLANE AND THE PLANE CONTAINING THE TWO PRIMARY QUANTA. '7' GAMMA-GAMMA WIDTH/TOTAL WIDTH '8' THE REDUCED MATRIX ELEMENT RATIO <2E1>/<2M1> @@;