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 /* NRDF D1765 Data No.26                                             */
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 /* Bibliography                                                      */
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 \\BIB,26;
 D#=D1765;
 TITLE=/Measurement of neutron-production double-differential cross
        sections for intermediate energy pion incident reaction/;
 PURPOSE=/To measure the neutron-production double-differential cross
          section for 870-MeV (momentum of 1.0-GeV/c) pi+ and pi- and
          2.1-GeV (that of 2.25-GeV/c) pi+ mesons incident on iron and
          lead targets at the pi2 beam line of the 12GeV proton
          synchrotron at High Energy Accelerator Research Organization
          (KEK)./;
 ATH=(Y.IWAMOTO'1', N.SHIGYO'1', H.KITSUKI'1', H.TENZOU'1',
      S.ISHIMOTO'1', K.MAEHATA'1', K.ISHIBASHI'1', T.NAKAMOTO'2',
      M.NUMAJIRI'2', S.MEIGO'3', H.TAKADA'3');
 INST-ATH=(2JPNKYU'1', 2JPNKEK'2', 2JPNJAE'3');
      /* '1' Department of Applied Quantum Physics and Nuclear
            Engineering */
 REF=(NST'4', PR/C'5');
 VLP=(38(2001)363'4', 70(2004)024602'5');
 /* '5' Y.Iwamoto+, Analysis with in-medium nucleon-nucleon elastic
        cross section */
 RCTS=(FE(PIP,N)X, FE(PIN,N)X, PB(PIP,N)X, PB(PIN,N)X);
 PHQS=ENGY-SPEC;
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 /* Experimental Conditions                                           */
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 \\EXP,26;
 /* 2004-10-13 : Converted, Converted from EXFOR E1765 */
 /* 2002-11-19 : Compiled */
 RTY=SPAL;
 PHQ=ENGY-SPEC;
 ENR=NAT;
 CHM=ELM;
 PHYS-FORM=SLD;
 BAC=X;
 POL-TGT=0%;
 ALGN-TGT=0%;
 ACC=SYN'6';
 /* '6' The pi-2 beam line of KEK */
 INST-ACC=2JPNKEK;
 ERS-PRJ=XKEV'7';
 /* '7' The momentum resolution of the secondary beam is about 1 %
 BEAM-INTNSTY=XMA'8';
 /* '8' 10**5 particles/2.5 s */
 POL-PRJ=0%;
 ION-SOURCE=/ Incident particles were generated as a secondary beam
              from an internal target mounted in the accelertor
              ring.For the positive beam incidence, the Time-of-Flight
              of incident particles was measured for separating pi+
              mesons from other particles by the use of a pair of Pilot
              U scintillators.Cerenkov counter was set up at the beam
              line to distinguish pi+ and mu+ particles. /;
 DET-PARTCL=N;
 COINC=NO;
 ANT-COINC=NO;
 DET-SYS=(SCT'9',SCT'10',TOF);
 /* '9' NE213 liquid scintillators of 12.7 cm in diameter and 12.7
        cm thick were placed in directions of 15 degree, 30 degree, 60
        degree, 90 degree, 120 degree for the neutron TOF measurements
 /* '10' NE102A plastic scintillators of 1 cm thick were mounted
         as veto detectors to eliminate charged-particle enents by the
         anticoincidence method */
 EFCN-DET=/ The neutron detection efficiencies were obtained by
            calculation results obtained from the SCINFUL (J.K.Dickens,
            SCINFUL: A monte Carlo Based Computer Program to Determine
            a Scintillator Full Energy Response to Neutron Detection
            for En between 0.1 and 80MeV: User's Manual and Fortran
            Program Listing, ORNL-6462,(1988).) and the
            CECIL(R.A.Cecil, et al., Nucl. Instrum. Methods., 161,
            439(1979).) codes. Calculated results of the neutron
            detection efficiencies for the four threshold levels are
            plotted in Fig. 6, p366 in reference. /;
 /* Experimental Method:
    - Time-of-flight
 RCT=PB(PIN,N)X;
 THK-TGT=XMG/CM**2'36';
 /* '36' 4.9cm in diameter and 1.7cm thick */
 INC-ENGY-LAB=870MEV;
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 /* Descriptive Parameters                                            */
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 \\DATA,26;
 INC-ENGY-LAB=870MEV;
 EMT=N;
 THTL=30DEG;
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 /* Data Table                                                        */
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 \DATA;
 ENGY-EMT-LAB DSIGMA/DOMEGA/DE DELTA-DSIGMA/DOMEGA/DE
 (MEV) (MB/SR/MEV) (MB/SR/MEV)
 1.25	342	83.89
 1.75	241	59.216
 2.5	204	50.086
 3.5	130.5	29.356
 4.5	104.44	23.513
 5.5	74.836	16.899
 7	50.457	11.368
 9	30.557	6.9205
 12.5	17.948	4.0477
 17.5	8.7723	1.9972
 22.5	7.8808	1.7969
 27.5	6.3137	1.4436
 35	5.429	1.2323
 45	5.1298	1.1627
 55	3.8322	0.87297
 65	3.3178	0.76305
 75	3.4984	0.80201
 90	1.1771	0.29037
 125	1.3039	0.31035
 175	0.6888	0.1669
 250	0.51462	0.12276
 350	0.29708	0.071583
 450	0.17204	0.041798
 550	0.10681	0.026296
 \END;
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