ENTRY 14573 20191012 14601457300000001 SUBENT 14573001 20191012 14601457300100001 BIB 12 57 1457300100002 TITLE First Measurement of the Total Neutron Cross Section 1457300100003 on Argon between 100 and 800 MeV 1457300100004 AUTHOR (B.Bhandari,J.Bian,K.Bilton,C.Callahan,J.Chaves, 1457300100005 H.Chen,D.Cline,R.L.Cooper,D.Danielson,J.Danielson, 1457300100006 N.Dokania,S.Elliott,S.Fernandes,S.Gardiner,G.Garvey, 1457300100007 V.Gehman,F.Giuliani,S.Glavin,M.Gold,C.Grant, 1457300100008 E.Guardincerri,T.Haines,A.Higuera,J.Y.Ji,R.Kadel, 1457300100009 N.Kamp,A.Karlin,W.Ketchum,L.W.Koerner,D.Lee,K.Lee, 1457300100010 Q.Liu,S.Locke,W.C.Louis,A.Manalaysay,J.Maricic, 1457300100011 E.Martin, M.J.Martinez,S.Martynenko,C.Mauger,C.McGrew, 1457300100012 J.Medina,P.J.Medina, A.Mills,G.Mills, 1457300100013 J.Mirabal-Martinez,A.Olivier,E.Pantic,B.Philipbar, 1457300100014 C.Pitcher,V.Radeka,J.Ramsey,K.Rielage,M.Rosen, 1457300100015 A.R.Sanchez,J.Shin,G.Sinnis,M.Smy,W.Sondheim,I.Stancu, 1457300100016 C.Sterbenz,Y.Sun,R.Svoboda,C.Taylor,A.Teymourian, 1457300100017 C.Thorn,C.E.Tull,M.Tzanov,R.G.Van De Water,D.Walker, 1457300100018 N.Walsh,H.Wang,Y.Wang,C.Yanagisawa,A.Yarritu,J.Yoo) 1457300100019 INSTITUTE (1USAHOU,1USAIRV,1USADAV,1USAPEN,1USABNL,1USACLA, 1457300100020 1USANMS,1USALAS,1USASTB,1USAUAL,1USABRK,1USANMX, 1457300100021 1USABST,1USALSU) 1457300100022 (1USAUSA) University of Hawaii at Manoa, Honolulu 1457300100023 REFERENCE (J,PRL,123,042502,2019) 1457300100024 FACILITY (LINAC,1USALAS) Experiment performed using the Mini- 1457300100025 CAPTAIN detector at the WNR/LANSCE beam at Los Alamos 1457300100026 SAMPLE Active Ar target within liquid Argon Time Projection 1457300100027 Chamber was used in experiment 1457300100028 DETECTOR (TPC) For total cross section a liquid argon time 1457300100029 projection chamber (TPC) - LArTPC with 400 kg of 1457300100030 instrumented mass was used. In addition to the TPC, 1457300100031 the detector was equipped with a photon detection 1457300100032 system (PDS) consisting of 24 photomultiplier tubes 1457300100033 PDS was used mainly to obtain time signal for TPC. 1457300100034 INC-SOURCE (SPALL) Neutrons with a broad energy spectrum up to 1457300100035 800 MeV were produced by spallation reaction of 800 1457300100036 MeV protons with Tungsten target. Macropulses with 1457300100037 time width of 625 mu-s were manipulated to get 1457300100038 microbunch spacing of 199 mu-s. The neutron flux was 1457300100039 further reduced to get neutron flux of 1 neutron per 1457300100040 macropulse to detector to prevent pile-up in TPC with 1457300100041 drift time of 200 mu-s. 1457300100042 METHOD (TOF) Incident neutron energy was determined using 1457300100043 time of flight method, determined by signal from PDS. 1457300100044 Tracks of charged particles, produced by neutron 1457300100045 interaction with liquid Argon and reconstructed using 1457300100046 signals from various planes of TPC detector were used 1457300100047 to determine number of neutrons in different depth 1457300100048 of the active Ar target-detector. 1457300100049 ANALYSIS Cross section determination is based on fact, that 1457300100050 neutron flux decreases as a function of depth in the 1457300100051 detector due to neutron interactions with argon. The 1457300100052 attenuation of the beam is proportional to the total 1457300100053 neutron-argon cross section. 1457300100054 ERR-ANALYS (DATA-ERR) Uncertainties were determined mainly by 1457300100055 simulations using Geant4 system. It was found, 1457300100056 that systematic uncertainties are negligible compared 1457300100057 to statistical uncertainties. 1457300100058 HISTORY (20191012C) Compiled by S.H. 1457300100059 ENDBIB 57 0 1457300100060 NOCOMMON 0 0 1457300100061 ENDSUBENT 60 0 1457300199999 SUBENT 14573002 20191012 14601457300200001 BIB 2 2 1457300200002 REACTION (18-AR-40(N,TOT),,SIG,,AV) 1457300200003 STATUS (TABLE) Data taken from tab. 1 of the reference 1457300200004 ENDBIB 2 0 1457300200005 NOCOMMON 0 0 1457300200006 DATA 4 6 1457300200007 EN-MIN EN-MAX DATA DATA-ERR 1457300200008 MEV MEV B B 1457300200009 100. 199. 0.49 0.34 1457300200010 199. 296. 0.88 0.16 1457300200011 296. 369. 0.89 0.26 1457300200012 369. 481. 0.94 0.2 1457300200013 481. 674. 1.2 0.18 1457300200014 674. 900. 0.83 0.32 1457300200015 ENDDATA 8 0 1457300200016 ENDSUBENT 15 0 1457300299999 ENDENTRY 2 0 1457399999999