ENTRY 10184 20241001 151510184000 1 SUBENT 10184001 20241001 151510184001 1 BIB 13 54 10184001 2 INSTITUTE (1USAWIS,1USAANL) 10184001 3 REFERENCE (J,PR/C,4,1061,1971) 10184001 4 #doi:10.1103/PhysRevC.4.1061 10184001 5 (J,BAP,16,1180(ED2),1971) 10184001 6 AUTHOR (J.C.Davis,K.A.Weaver,D.Hilscher,H.H.Barschall, 10184001 7 A.B.Smith) 10184001 8 TITLE Total Cross Section of Protons for 2.5 MeV Neutrons. 10184001 9 FACILITY (DYNAM,1USAANL) Tandem dynamitron pulsed at 2 MHz. 10184001 10 INC-SOURCE (P-LI7) 7Li(p,n) reaction. Neutron energy calibrated 10184001 11 by maintaining second group of 7Li(p,n) neutrons at 10184001 12 peak of 2.708+-2 keV carbon resonance. Conclude energy10184001 13 constant within 3 keV. 10184001 14 INC-SPECT Neutron energy in reference 2535 keV. Authors revised 10184001 15 value to 2533 keV due to new high precision value for 10184001 16 energy of 7Li(p,n) second group (see Phys.Rev.C5,284 10184001 17 (1972)). New value 429 keV versus value of 431 keV 10184001 18 used in reference. 10184001 19 SAMPLE Three hydrocarbon compounds used - n-hexane, isooctane,10184001 20 and cyclohexane. At least 99.9% pure. Graphite 10184001 21 subtraction samples (DFP-1 grade). Thin-walled 10184001 22 stainless steel containers, 1.9 cm dia., with lengths 10184001 23 between 6 and 10 cm. 10184001 24 DETECTOR (SCIN) NE218 organic liquid scintillator, 5cm.dia. by 10184001 25 2.5cm thick. Identical detector used as monitor. 10184001 26 Source-to-sample distance 43 cm. Sample-to-detector 10184001 27 distance 200cm. Detector in massive shield. Monitor 10184001 28 200cm from sample at 14 degrees to proton beam. 10184001 29 CORRECTION Transmissions corrected for background, counting 10184001 30 losses, inscattering, temperature changes, and air 10184001 31 scattering. 10184001 32 ERR-ANALYS (ERR-SYS) Systematic uncertainty 10184001 33 RMS of following uncertainties (in %) 10184001 34 (ERR-1) energy determination 0.07 10184001 35 (ERR-2) sample density 0.06 10184001 36 (ERR-3) sample container length 0.05 10184001 37 (ERR-4) sample purity 0.03 10184001 38 (ERR-5) neutron background 0.02 10184001 39 (ERR-6) counting losses 0.02 10184001 40 (ERR-7) number of atoms in graphite 0.02 10184001 41 (ERR-8) inscattering 0.01 10184001 42 (ERR-S) Statistical uncertainty. 10184001 43 Standard deviation (which includes any instabilities 10184001 44 in detector or electronics) -2.3 mb. 10184001 45 (ERR-T) Total uncertainty. 10184001 46 STATUS (APRVD) Approved by author. 10184001 47 (TABLE,,J.C.Davis+,J,PR/C,4,1061,1971) 10184001 48 Data taken from Table IV of main reference. 10184001 49 HISTORY (19711203C) 10184001 50 (19750902A) BIB changes 10184001 51 (19820916A) Converted to REACTION formalism 10184001 52 (20010214A) Converted to new date formats, lower case. 10184001 53 (20101018A) VM: Error heading update. 10184001 54 Correction to 10184.002. 10184001 55 (20240930A) OS. REFERENCE code corrected 10184001 56 ENDBIB 54 0 10184001 57 COMMON 8 6 10184001 58 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 10184001 59 ERR-7 ERR-8 10184001 60 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 10184001 61 PER-CENT PER-CENT 10184001 62 0.07 0.06 0.05 0.03 0.02 0.02 10184001 63 0.02 0.01 10184001 64 ENDCOMMON 6 0 10184001 65 ENDSUBENT 64 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