ENTRY 23747 20210908 23112374700000001 SUBENT 23747001 20210908 23112374700100001 BIB 16 76 2374700100002 TITLE Measurement of the total neutron-scattering 2374700100003 cross-section ratios of noble gases of natural 2374700100004 isotopic composition using a pulsed neutron beam. 2374700100005 AUTHOR (C.C.Haddock,M.Hiromoto,K.Hirota,T.Ino,M.Kitaguchi, 2374700100006 K.Mishima,N.Oi,T.Shima,H.M.Shimizu,W.M.Snow, 2374700100007 T.Yoshioka) 2374700100008 INSTITUTE (1USANIS,2JPNOSA,2JPNNAG,2JPNKEK,1USAINU,2JPNKYU) 2374700100009 REFERENCE (J,PR/C,100,064002,2019) 2374700100010 #doi:10.1103/PhysRevC.100.064002 2374700100011 FACILITY (SYNCH,2JPNKEK) BL05 Low-Divergence beam branch in 2374700100012 MLF at J-PARC 2374700100013 INC-SOURCE (SPALL) The pulsed neutron beams are produced by the 2374700100014 spallation process at the MLF in J-PARC. 2374700100015 Peak energy was 11.7 meV at the time of measurement. 2374700100016 The proton beam power was approximately 410 kW. 2374700100017 SAMPLE Natural noble gas (He, Ar, Kr and Xe) was used as 2374700100018 target and Ne gas was used as a monitor material. 2374700100019 The gas was filled in an aluminum target cell with 2374700100020 a diameter of 50 mm and a length of 150 mm giving it 2374700100021 a volume of about 300 cm3. 2374700100022 The gas was pressurized to approximately 1.85 atm and 2374700100023 the pressure and temperature was monitored 2374700100024 continuously throughout each run. 2374700100025 DETECTOR (PS,PROPC) Neutrons scattered by the target gas were 2374700100026 detected by a 3He-gas-filled position sensitive 2374700100027 detector (HePSD). 2374700100028 The HePSD contained seven proportional counter tubes 2374700100029 each with a diameter of 12.7 mm covering an area 2374700100030 600 mm wide and 90 mm high. 2374700100031 METHOD (TOF) 2374700100032 -Acquire angular and energy-dependent scattering data 2374700100033 for target gases and Ne. 2374700100034 ANALYSIS The neutron count rate was measured separately for 2374700100035 each gas species and for the empty cell. 2374700100036 Empty-cell data are subtracted from that of 2374700100037 the gas-filled cell and normalized by the number 2374700100038 density and the proton beam power at MLF. 2374700100039 Form the ratios of the results of target gases (He, Ar,2374700100040 Kr and Xe) with respect to that of Ne. 2374700100041 Perform a Monte Carlo simulation in order to correct 2374700100042 the differences of angular distribution of scattered 2374700100043 neutrons between the target gases and Ne. 2374700100044 Using the experimental event rates of the target gases 2374700100045 relative to the measured Ne data and scattering cross 2374700100046 sections of Ne, scattering cross section of the target 2374700100047 gases were deduced. 2374700100048 The free atom cross sections were calculated from the 2374700100049 deduced bound atom cross sections. 2374700100050 ERR-ANALYS In the analysis, 2374700100051 -Statistical uncertainty in the ecperiments 2374700100052 -Systemtic uncertainties due to pressure and 2374700100053 temperature stability 2374700100054 -Systemtic uncertainties due to pressure dependence of 2374700100055 cell geometry (negligibly small), 2374700100056 -Systemtic uncertainties due to multiple scattering 2374700100057 (<0.1%) 2374700100058 -Uncertainty in the simulation 2374700100059 were discussed. 2374700100060 (ERR-T) Total Uncertainty. 2374700100061 (ERR-S) Statistical uncertainty in the experiments. 2374700100062 Calculated from third column of TABLE I in the 2374700100063 REFERENCE. 2374700100064 The values were comfirmed by the AUTHORS. 2374700100065 (ERR-1) Uncertainty in simulation. 2374700100066 Calculated from fourth column of TABLE I in the 2374700100067 REFERENCE. 2374700100068 The coded values were comfirmed by the AUTHORS. 2374700100069 STATUS (TABLE) TABLE I and II in the REFERENCE. 2374700100070 MONITOR (10-NE-0(N,THS)10-NE-0,BA,SIG) 2374700100071 MONIT-REF ((MONIT),V.F.Sears,J,NNEWS,3,26,1992) Total bound 2374700100072 scattering cross section, 2.628 +- 6(b) , was given. 2374700100073 REL-REF (I,,K.Mishima+,J,NIM/A,600,342,2009) Details of BL05 2374700100074 of MLF at J-PARC. 2374700100075 (I,,C.C.Haddock+,J,PR/D,97,062002,2018) Details of 2374700100076 the Detector system. 2374700100077 HISTORY (20210908C) Atsushi Kimura 2374700100078 ENDBIB 76 0 2374700100079 COMMON 2 3 2374700100080 MONIT MONIT-ERR 2374700100081 B B 2374700100082 2.383 0.006 2374700100083 ENDCOMMON 3 0 2374700100084 ENDSUBENT 83 0 2374700199999 SUBENT 23747002 20210908 23112374700200001 BIB 1 2 2374700200002 REACTION 1(2-HE-0(N,THS)2-HE-0,FA,SIG) 2374700200003 2(2-HE-0(N,THS)2-HE-0,BA,SIG) 2374700200004 ENDBIB 2 0 2374700200005 COMMON 2 3 2374700200006 ERR-S ERR-1 2374700200007 PER-CENT PER-CENT 2374700200008 0.30 0.25 2374700200009 ENDCOMMON 3 0 2374700200010 DATA 5 1 2374700200011 EN DATA 1ERR-T 1DATA 2ERR-T 2 2374700200012 MILLI-EV B B B B 2374700200013 0.0 0.7599 0.0030 1.188 0.005 2374700200014 ENDDATA 3 0 2374700200015 ENDSUBENT 14 0 2374700299999 SUBENT 23747003 20210908 23112374700300001 BIB 1 2 2374700300002 REACTION 1(18-AR-0(N,THS)18-AR-0,FA,SIG) 2374700300003 2(18-AR-0(N,THS)18-AR-0,BA,SIG) 2374700300004 ENDBIB 2 0 2374700300005 COMMON 2 3 2374700300006 ERR-S ERR-1 2374700300007 PER-CENT PER-CENT 2374700300008 0.63 0.25 2374700300009 ENDCOMMON 3 0 2374700300010 DATA 5 1 2374700300011 EN DATA 1ERR-T 1DATA 2ERR-T 2 2374700300012 MILLI-EV B B B B 2374700300013 0.0 0.648 0.006 0.683 0.005 2374700300014 ENDDATA 3 0 2374700300015 ENDSUBENT 14 0 2374700399999 SUBENT 23747004 20210908 23112374700400001 BIB 1 2 2374700400002 REACTION 1(36-KR-0(N,THS)36-KR-0,FA,SIG) 2374700400003 2(36-KR-0(N,THS)36-KR-0,BA,SIG) 2374700400004 ENDBIB 2 0 2374700400005 COMMON 2 3 2374700400006 ERR-S ERR-1 2374700400007 PER-CENT PER-CENT 2374700400008 0.25 0.25 2374700400009 ENDCOMMON 3 0 2374700400010 DATA 5 1 2374700400011 EN DATA 1ERR-T 1DATA 2ERR-T 2 2374700400012 MILLI-EV B B B B 2374700400013 0.0 7.503 0.026 7.685 0.026 2374700400014 ENDDATA 3 0 2374700400015 ENDSUBENT 14 0 2374700499999 SUBENT 23747005 20210908 23112374700500001 BIB 1 2 2374700500002 REACTION 1(54-XE-0(N,THS)54-XE-0,FA,SIG) 2374700500003 2(54-XE-0(N,THS)54-XE-0,BA,SIG) 2374700500004 ENDBIB 2 0 2374700500005 COMMON 2 3 2374700500006 ERR-S ERR-1 2374700500007 PER-CENT PER-CENT 2374700500008 0.29 0.24 2374700500009 ENDCOMMON 3 0 2374700500010 DATA 5 1 2374700500011 EN DATA 1ERR-T 1DATA 2ERR-T 2 2374700500012 MILLI-EV B B B B 2374700500013 0.0 4.278 0.016 4.344 0.017 2374700500014 ENDDATA 3 0 2374700500015 ENDSUBENT 14 0 2374700599999 ENDENTRY 5 0 2374799999999