ENTRY 10184 20101018 13691018400000001 SUBENT 10184001 20101018 13691018400100001 BIB 13 51 1018400100002 INSTITUTE (1USAWIS,1USAANL) 1018400100003 REFERENCE (J,PR/C,4,1061,197110) 1018400100004 (J,BAP,16,1180,197110) 1018400100005 AUTHOR (J.C.Davis,K.A.Weaver,D.Hilscher,H.H.Barschall, 1018400100006 A.B.Smith) 1018400100007 TITLE Total Cross Section of Protons for 2.5 MeV Neutrons. 1018400100008 FACILITY (DYNAM,1USAANL) Tandem dynamitron pulsed at 2 MHz. 1018400100009 INC-SOURCE (P-LI7) 7Li(p,n) reaction. Neutron energy calibrated 1018400100010 by maintaining second group of 7Li(p,n) neutrons at 1018400100011 peak of 2.708+-2 keV carbon resonance. Conclude energy1018400100012 constant within 3 keV. 1018400100013 INC-SPECT Neutron energy in reference 2535 keV. Authors revised 1018400100014 value to 2533 keV due to new high precision value for 1018400100015 energy of 7Li(p,n) second group (see Phys.Rev.C5,284 1018400100016 (1972)). New value 429 keV versus value of 431 keV 1018400100017 used in reference. 1018400100018 SAMPLE Three hydrocarbon compounds used - n-hexane, isooctane,1018400100019 and cyclohexane. At least 99.9% pure. Graphite 1018400100020 subtraction samples (DFP-1 grade). Thin-walled 1018400100021 stainless steel containers, 1.9 cm dia., with lengths 1018400100022 between 6 and 10 cm. 1018400100023 DETECTOR (SCIN) NE218 organic liquid scintillator, 5cm.dia. by 1018400100024 2.5cm thick. Identical detector used as monitor. 1018400100025 Source-to-sample distance 43 cm. Sample-to-detector 1018400100026 distance 200cm. Detector in massive shield. Monitor 1018400100027 200cm from sample at 14 degrees to proton beam. 1018400100028 CORRECTION Transmissions corrected for background, counting 1018400100029 losses, inscattering, temperature changes, and air 1018400100030 scattering. 1018400100031 ERR-ANALYS (ERR-SYS) Systematic uncertainty 1018400100032 RMS of following uncertainties (in %) 1018400100033 (ERR-1,,,1.0) energy determination 0.07 1018400100034 (ERR-2,,,1.0) sample density 0.06 1018400100035 (ERR-3,,,1.0) sample container length 0.05 1018400100036 (ERR-4,,,1.0) sample purity 0.03 1018400100037 (ERR-5,,,1.0) neutron background 0.02 1018400100038 (ERR-6,,,1.0) counting losses 0.02 1018400100039 (ERR-7,,,1.0) number of atoms in graphite 0.02 1018400100040 (ERR-8,,,1.0) inscattering 0.01 1018400100041 (ERR-S) Statistical uncertainty. 1018400100042 Standard deviation (which includes any instabilities 1018400100043 in detector or electronics) -2.3 mb. 1018400100044 (ERR-T) Total uncertainty. 1018400100045 STATUS (APRVD) Approved by author. 1018400100046 (TABLE) Data taken from Table IV of main reference. 1018400100047 HISTORY (19711203C) 1018400100048 (19750902A) BIB changes 1018400100049 (19820916A) Converted to REACTION formalism 1018400100050 (20010214A) Converted to new date formats, lower case. 1018400100051 (20101018A) VM: Error heading update. 1018400100052 Correction to 10184.002. 1018400100053 ENDBIB 51 0 1018400100054 COMMON 8 6 1018400100055 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 1018400100056 ERR-7 ERR-8 1018400100057 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1018400100058 PER-CENT PER-CENT 1018400100059 0.07 0.06 0.05 0.03 0.02 0.02 1018400100060 0.02 0.01 1018400100061 ENDCOMMON 6 0 1018400100062 ENDSUBENT 61 0 1018400199999 SUBENT 10184002 20101018 13691018400200001 BIB 2 3 1018400200002 REACTION (1-H-1(N,TOT),,SIG) 1018400200003 HISTORY (20100930A) Error heading update. Systematic 1018400200004 uncertainty added. 1018400200005 ENDBIB 3 0 1018400200006 NOCOMMON 0 0 1018400200007 DATA 6 1 1018400200008 EN EN-ERR DATA ERR-S ERR-SYS ERR-T 1018400200009 KEV KEV MB MB PER-CENT MB 1018400200010 2533. 3. 2536. 1.5 0.12 4. 1018400200011 ENDDATA 3 0 1018400200012 ENDSUBENT 11 0 1018400299999 ENDENTRY 2 0 1018499999999