/*===================================================================*/
 /* NRDF D1765 Data No.16                                             */
 /*===================================================================*/
 /* Bibliography                                                      */
 /*===================================================================*/
 \\BIB,16;
 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;
 /*===================================================================*/
 /* Experimental Conditions                                           */
 /*===================================================================*/
 \\EXP,16;
 /* 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=FE(PIP,N)X;
 THK-TGT=XMG/CM**2'26';
 /* '26' 4.9cm in diameter and 3.0cm thick */
 INC-ENGY-LAB=2.1GEV;
 /*===================================================================*/
 /* Descriptive Parameters                                            */
 /*===================================================================*/
 \\DATA,16;
 INC-ENGY-LAB=2.1GEV;
 EMT=N;
 THTL=90DEG;
 /*===================================================================*/
 /* Data Table                                                        */
 /*===================================================================*/
 \DATA;
 ENGY-EMT-LAB DSIGMA/DOMEGA/DE DELTA-DSIGMA/DOMEGA/DE
 (MEV) (MB/SR/MEV) (MB/SR/MEV)
 1.25	23.2	7.0059
 1.75	20.3	6.1402
 2.5	15.6	4.7059
 3.5	13.004	2.9629
 4.5	10.926	2.4863
 5.5	8.7574	2.0016
 7	6.6262	1.5036
 9	4.909	1.1219
 12.5	2.9391	0.66921
 17.5	1.9506	0.44854
 22.5	1.2922	0.30528
 27.5	1.1727	0.27988
 35	1.0638	0.2478
 45	0.83888	0.19823
 55	0.81218	0.19411
 65	0.71927	0.17444
 75	0.58175	0.14411
 90	0.43395	0.10899
 125	0.23742	0.058791
 175	0.079733	0.022224
 250	0.040363	0.01103
 350	0.016472	0.0050562
 450	0.011612	0.0037467
 550	0.0079636	0.0029743
 650	0.0019622	0.001112
 \END;
 /*===================================================================*/