ENTRY 14705 20210421 14841470500000001 SUBENT 14705001 20210421 14841470500100001 BIB 10 44 1470500100002 TITLE Angular Distribution of n-p Scattering with 90-Mev 1470500100003 Neutrons 1470500100004 AUTHOR (J.Hadley,E.L.Kelly,C.E.Leith,E.Segre,C.Wiegand, 1470500100005 H.F.York) 1470500100006 REFERENCE (J,PR,73,1114,1948) 1470500100007 #doi:10.1103/PhysRev.73.1114 1470500100008 INSTITUTE (1USABRK) 1470500100009 INC-SOURCE (D-BE) 1470500100010 FACILITY (CYCLO,1USABRK) 184-inch cyclotron. 1470500100011 DETECTOR (PROPC,TELES,FISCH) 1470500100012 METHOD (REC,COINC) The neutron beam produced by stripping 1470500100013 180-MeV deuterons on a Be target was collimated to 1470500100014 about 2.5-cm diameter and scattered by paragon or 1470500100015 polyethylene targets which were larger in diameter 1470500100016 than the neutron beam. The recoil protons used for 1470500100017 the measurement were detected by a telescope of three 1470500100018 proportional counters in coincidence pointing towards 1470500100019 the scatterer. The primary neutron beam was monitored 1470500100020 either by the protons scattered by an auxiliary 1470500100021 hydrogenous target or by a bismuth fission chamber. 1470500100022 By taking background measurements with a carbon 1470500100023 scatterer and with no scatterer we distinguished the 1470500100024 protons due to n-p scattering and those due to (n-p) 1470500100025 reactions on C and air. 1470500100026 ERR-ANALYS (ERR-S) The errors listed are based only on 1470500100027 statistical standard deviations. In order to avoid 1470500100028 some sources of systematic error in these experiments, 1470500100029 we have checked the following: 1. Plateau of the 1470500100030 coincidence counting rate of the counter telescope 1470500100031 versus voltage in the counters, bias voltage of the 1470500100032 discriminators, duration of the opening of the 1470500100033 coincidence gate of the counters. 2. Proportionality 1470500100034 of the number of coincidence counts in the telescope 1470500100035 to the intensity of the primary beam and to the 1470500100036 thickness of the scattering target for a given 1470500100037 primary neutron beam. 3. The influence of Rutherford 1470500100038 scattering of the absorber A on the efficiency of the 1470500100039 coincidence telescope. 4. Scattering by the air 1470500100040 column traversed by the neutron beam. 5. The error 1470500100041 introduced by the finite dimensions of the scattering 1470500100042 target. 6. Whether the coincidence system counted 1470500100043 only protons coming from the scatterer and all those 1470500100044 with energy >66 cosine**2 theta. 1470500100045 HISTORY (20210421C) BP 1470500100046 ENDBIB 44 0 1470500100047 COMMON 1 3 1470500100048 EN 1470500100049 MEV 1470500100050 90.0 1470500100051 ENDCOMMON 3 0 1470500100052 ENDSUBENT 51 0 1470500199999 SUBENT 14705002 20210421 14841470500200001 BIB 3 3 1470500200002 REACTION (1-H-1(N,EL)1-H-1,,DA) 1470500200003 METHOD Composite of runs on apparatus 1. 1470500200004 STATUS (TABLE) Table I, page 1114. 1470500200005 ENDBIB 3 0 1470500200006 NOCOMMON 0 0 1470500200007 DATA 3 11 1470500200008 ANG-CM DATA-CM ERR-S 1470500200009 ADEG MB/SR MB/SR 1470500200010 70.0 4.37 0.4 1470500200011 80.0 4.26 0.35 1470500200012 90.0 4.20 0.24 1470500200013 100.0 4.70 0.30 1470500200014 110.0 5.02 0.34 1470500200015 120.0 5.90 0.27 1470500200016 130.0 6.68 0.31 1470500200017 140.0 7.95 0.31 1470500200018 150.0 9.25 0.44 1470500200019 160.0 10.55 0.38 1470500200020 170.0 12.60 0.58 1470500200021 ENDDATA 13 0 1470500200022 ENDSUBENT 21 0 1470500299999 SUBENT 14705003 20210421 14841470500300001 BIB 3 3 1470500300002 REACTION (1-H-1(N,EL)1-H-1,,DA) 1470500300003 METHOD Run on apparatus 2, scatterer 150 mg/cm2 (CH2)n. 1470500300004 STATUS (TABLE) Table I, page 1114. 1470500300005 ENDBIB 3 0 1470500300006 NOCOMMON 0 0 1470500300007 DATA 3 11 1470500300008 ANG-CM DATA-CM ERR-S 1470500300009 ADEG MB/SR MB/SR 1470500300010 70.0 3.53 0.28 1470500300011 80.0 3.25 0.49 1470500300012 90.0 4.40 0.42 1470500300013 100.0 4.24 0.61 1470500300014 110.0 5.18 0.61 1470500300015 120.0 5.97 0.63 1470500300016 130.0 7.00 0.70 1470500300017 140.0 7.85 0.78 1470500300018 150.0 9.90 0.70 1470500300019 160.0 12.70 1.06 1470500300020 170.0 12.75 1.40 1470500300021 ENDDATA 13 0 1470500300022 ENDSUBENT 21 0 1470500399999 SUBENT 14705004 20210421 14841470500400001 BIB 3 3 1470500400002 REACTION (1-H-1(N,EL)1-H-1,,DA) 1470500400003 METHOD Run on apparatus 2, scatterer 283 mg/cm2 (CH2)n. 1470500400004 STATUS (TABLE) Table I, page 1114. 1470500400005 ENDBIB 3 0 1470500400006 NOCOMMON 0 0 1470500400007 DATA 3 11 1470500400008 ANG-CM DATA-CM ERR-S 1470500400009 ADEG MB/SR MB/SR 1470500400010 70.0 3.90 0.37 1470500400011 80.0 4.04 0.37 1470500400012 90.0 4.51 0.49 1470500400013 100.0 4.80 0.37 1470500400014 110.0 5.30 0.35 1470500400015 120.0 6.32 0.45 1470500400016 130.0 6.15 0.38 1470500400017 140.0 8.47 0.56 1470500400018 150.0 9.40 0.54 1470500400019 160.0 10.75 0.79 1470500400020 170.0 12.32 0.94 1470500400021 ENDDATA 13 0 1470500400022 ENDSUBENT 21 0 1470500499999 SUBENT 14705005 20210421 14841470500500001 BIB 3 6 1470500500002 REACTION (1-H-1(N,EL)1-H-1,,DA) 1470500500003 ANALYSIS Weighted average of all runs with estimated error. 1470500500004 STATUS (DEP,14705002) 1470500500005 (DEP,14705003) 1470500500006 (DEP,14705004) 1470500500007 (TABLE) Table I, page 1114. 1470500500008 ENDBIB 6 0 1470500500009 NOCOMMON 0 0 1470500500010 DATA 3 11 1470500500011 ANG-CM DATA-CM ERR-S 1470500500012 ADEG MB/SR MB/SR 1470500500013 70.0 4.08 0.31 1470500500014 80.0 4.02 0.25 1470500500015 90.0 4.35 0.24 1470500500016 100.0 4.67 0.27 1470500500017 110.0 5.14 0.25 1470500500018 120.0 6.04 0.24 1470500500019 130.0 6.56 0.27 1470500500020 140.0 8.12 0.28 1470500500021 150.0 9.41 0.41 1470500500022 160.0 10.77 0.38 1470500500023 170.0 12.57 0.50 1470500500024 ENDDATA 13 0 1470500500025 ENDSUBENT 24 0 1470500599999 ENDENTRY 5 0 1470599999999