/*===================================================================*/ /* NRDF D1765 Data No.23 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,23; 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,23; /* 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(PIP,N)X; THK-TGT=XMG/CM**2'33'; /* '33' 4.9cm in diameter and 1.7cm thick */ INC-ENGY-LAB=870MEV; /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,23; INC-ENGY-LAB=870MEV; EMT=N; THTL=120DEG; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; ENGY-EMT-LAB DSIGMA/DOMEGA/DE DELTA-DSIGMA/DOMEGA/DE (MEV) (MB/SR/MEV) (MB/SR/MEV) 1.25 282 69.104 1.75 242 59.34 2.5 169 41.452 3.5 100.38 22.641 4.5 80.157 18.084 5.5 57.823 13.094 7 40.471 9.1377 9 24.816 5.6533 12.5 12.353 2.8123 17.5 6.4653 1.4936 22.5 4.8285 1.1345 27.5 3.2692 0.78451 35 2.5207 0.5979 45 1.7341 0.42407 55 1.2885 0.32885 65 1.2247 0.31309 75 0.92949 0.25683 90 0.35517 0.11013 125 0.20861 0.05942 175 0.12146 0.040712 250 0.010498 0.01072 \END; /*===================================================================*/ |