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/* NRDF D1765 Data No.22 */
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/* Bibliography */
/*===================================================================*/
\\BIB,22;
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,22;
/* 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**2'32';
/* '32' 4.9cm in diameter and 1.7cm thick */
INC-ENGY-LAB=870MEV;
/*===================================================================*/
/* Descriptive Parameters */
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\\DATA,22;
INC-ENGY-LAB=870MEV;
EMT=N;
THTL=90DEG;
/*===================================================================*/
/* Data Table */
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\DATA;
ENGY-EMT-LAB DSIGMA/DOMEGA/DE DELTA-DSIGMA/DOMEGA/DE
(MEV) (MB/SR/MEV) (MB/SR/MEV)
1.25 245 60.054
1.75 218 53.482
2.5 168 41.216
3.5 130.73 29.395
4.5 97.2 21.871
5.5 74.708 16.847
7 45.609 10.277
9 27.283 6.19
12.5 14.751 3.3414
17.5 8.5411 1.9493
22.5 6.2025 1.4354
27.5 4.5634 1.0743
35 3.4733 0.80778
45 2.5166 0.59899
55 2.1619 0.52352
65 2.2397 0.54184
75 1.6516 0.41327
90 0.8553 0.22404
125 0.45408 0.11717
175 0.12279 0.043146
250 0.07224 0.022363
350 0.0037369 0.0065212
\END;
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