ENTRY 21815 20211227 23092181500000001 SUBENT 21815001 20211227 23092181500100001 BIB 12 70 2181500100002 TITLE Neutron-proton scattering in the energy range 2181500100003 70 to 170 MeV 2181500100004 AUTHOR (T.C.Griffith,A.P.Banford,M.Y.Uppal, W.S.C.Williams) 2181500100005 INSTITUTE (2UK LON) Physics Department, University 2181500100006 College London. 2181500100007 REFERENCE (J,PPS,71,305,1958) 2181500100008 FACILITY (SYNCY,2UK HAR) Harwell synchrocyclotron. 2181500100009 INC-SOURCE (P-BE) Protons from synchrocyclotron with 2181500100010 a maximum energy of 170 MeV impinging onto 2181500100011 a Be-target of 0.25 inch thickness. The n-beam 2181500100012 was confined to a diameter of 2 inches by 2181500100013 means of a concrete shielding. 2181500100014 INC-SPECT The neutron spectrum ranged from about 50 to 170 MeV, 2181500100015 with a peak near 140 MeV. A graph of the spectrum 2181500100016 is given in figure 8 of the main reference. 2181500100017 The quantity 'En-mean' is a spectrum averaged 2181500100018 energy between the limits 'En-min' and 'En-max'. 2181500100019 it is called the 'effective energy' in the main 2181500100020 reference. The quantity 'En-err' is the error in 2181500100021 'En-mean' and arises from the error in the 2181500100022 measured spectrum. 2181500100023 SAMPLE Both samples (polyethylene and carbon) were 2181500100024 5 inches long an 1.5 inches wide. They were 2181500100025 100-200 microns thick. 2181500100026 The polyethylene sample was cut from a sheet 2181500100027 of about 100 microns thickness. It consisted 2181500100028 of 100% pure (C-H(2))(n). The thickness 2181500100029 was 10.54 +-0.01 mg/cm**2. 2181500100030 The carbon sample was prepared by drying out 2181500100031 of aquadag which had been diluted in water, 2181500100032 in a metal mould. Removal of the dry C-film 2181500100033 was facilitated by the use of a wet sheet of 2181500100034 cellophane tightly stretched over the base of 2181500100035 the mould. Its thickness was 13.62 +- 0.03 mg/cm**2 2181500100036 and was chosen so as to produce the same energy 2181500100037 loss as the polyethylene target film. It consisted 2181500100038 of 93.4% carbon, 1% hydrogen and 5.6% oxygen. 2181500100039 METHOD (REC) Measurement of the angular distributions of the 2181500100040 recoiling particles from a carbon scatterer and from 2181500100041 a polyethylene scatterer. 2181500100042 The difference yields the amounts of protons recoiling2181500100043 from hydrogen nuclei as a function of the recoil angles2181500100044 From these amounts the hydrogen elastic scattering 2181500100045 angular distributions can be derived. 2181500100046 The proton angles are determined by the analysis 2181500100047 of the proton tracks in a photographic emulsion. 2181500100048 The proton energies are determined from 2181500100049 the ranges of the protons in this emulsion. 2181500100050 From this proton energy the neutron energy 2181500100051 can be derived. 2181500100052 DETECTOR (TRD) Scattering chamber under a pressure of 2181500100053 1.E-2 cm Hg containing four 1.5 um thick glass plates 2181500100054 coated with a 600 micron layer of Ilford C2 2181500100055 photographic emulsion and a 25 micron supercoat of 2181500100056 Ilford G5 emulsion. 2181500100057 The four plates were held at angles of 54, 44, 34 2181500100058 and 24 degrees to the neutron beam. 2181500100059 The plates at 44,34 and 24 degerees were behind 2181500100060 aluminium absorbers designed to bring most of 2181500100061 recoils to rest in the emulsion. Unfortunately 2181500100062 the effect of multiple scattering in the 2181500100063 aluminium was too large, and it was not possible 2181500100064 to use the measurements on the plates at 34 and 2181500100065 24 degrees. 2181500100066 CORRECTION Background from scattering by the nylon 2181500100067 thread used to suspend the samples. 2181500100068 Interactions of the neutrons with the C-nuclei. 2181500100069 HISTORY (19820803C) G.C. 2181500100070 (20211227A) SD:Updated to new date formats,lower case. 2181500100071 Corrections in all Subents. Subents 002-004 were merged2181500100072 ENDBIB 70 0 2181500100073 NOCOMMON 0 0 2181500100074 ENDSUBENT 73 0 2181500199999 SUBENT 21815002 20211227 23092181500200001 BIB 6 14 2181500200002 REACTION (1-H-1(N,EL)1-H-1,,DA,,SPA) 2181500200003 MONITOR (1-H-1(N,EL)1-H-1,,DA) At 62.5 degrees, data 2181500200004 presented in Subent 005. 2181500200005 COMMENT The data is derived from measurements on 2181500200006 the photographic plate at 54 degrees. 2181500200007 ERR-ANALYS (DATA-ERR) Standard deviations arising mainly 2181500200008 from the statistical error in the number 2181500200009 of tracks counted. 2181500200010 The error involved in the normalization has not been 2181500200011 included. 2181500200012 STATUS (TABLE) Table 3 of Proc.Phys.Soc.(London),71(1958)305 2181500200013 (DEP,21815005) Monitor reaction 2181500200014 HISTORY (20211227A) SD: STATUS updated. Data from Subents 003 2181500200015 and 004 were added. ERR-S -> DATA-ERR. COMMON added. 2181500200016 ENDBIB 14 0 2181500200017 COMMON 1 3 2181500200018 ANG-NRM 2181500200019 ADEG 2181500200020 62.5 2181500200021 ENDCOMMON 3 0 2181500200022 DATA 7 16 2181500200023 EN-MEAN EN-ERR ANG-CM DATA-CM DATA-ERR EN-MIN 2181500200024 EN-MAX 2181500200025 MEV MEV ADEG MB/SR MB/SR MEV 2181500200026 MEV 2181500200027 96. 4.0 29.3 9.0 1.3 70.2181500200028 120. 2181500200029 96. 4.0 39.1 7.65 0.70 70.2181500200030 120. 2181500200031 96. 4.0 48.9 6.00 0.75 70.2181500200032 120. 2181500200033 96. 4.0 58.8 5.2 0.85 70.2181500200034 120. 2181500200035 130. 5.0 19.3 6.40 0.90 100.2181500200036 170. 2181500200037 130. 5.0 29.1 5.56 0.45 100.2181500200038 170. 2181500200039 130. 5.0 38.8 4.55 0.37 100.2181500200040 170. 2181500200041 130. 5.0 48.6 3.82 0.32 100.2181500200042 170. 2181500200043 130. 5.0 58.4 2.96 0.34 100.2181500200044 170. 2181500200045 130. 5.0 68.2 2.89 0.51 100.2181500200046 170. 2181500200047 130. 5.0 78.1 2.60 0.70 100.2181500200048 170. 2181500200049 137.2 5.0 19.3 6.65 1.30 120.2181500200050 170. 2181500200051 137.2 5.0 29.0 5.41 0.52 120.2181500200052 170. 2181500200053 137.2 5.0 38.7 4.35 0.40 120.2181500200054 170. 2181500200055 137.2 5.0 48.4 3.63 0.40 120.2181500200056 170. 2181500200057 137.2 5.0 58.3 2.85 0.45 120.2181500200058 170. 2181500200059 ENDDATA 36 0 2181500200060 ENDSUBENT 59 0 2181500299999 NOSUBENT 21815003 20211227 23092181500300001 NOSUBENT 21815004 20211227 23092181500400001 SUBENT 21815005 20211227 23092181500500001 BIB 7 20 2181500500002 REACTION (1-H-1(N,EL)1-H-1,,DA,,SPA,DERIV) 2181500500003 SAMPLE 10.54 mg/cm2 2181500500004 ANALYSIS Normalization was done using data interpolated 2181500500005 from the results of (see REL-REF): 2181500500006 * Hadley et al. (1949) at 40 MeV; 2181500500007 * Stahl and Ramsey (1954) (collected data), at 90 MeV 2181500500008 * Thresher et al. (1955), at 105 and 137 MeV; 2181500500009 * Randle et al. (1952, 1956), at 156 and 130 MeV; 2181500500010 * Kelly et al. (1950), at 260 MeV. 2181500500011 REL-REF (R,11167001,J.Hadley+,J,PR,75,351,1949) 2181500500012 (R,11083001,R.H.Stahl+,J,PR,96,1310,1954) 2181500500013 (R,21800001,J.J.Thresher+,J,PRE/A,229,492,1955) 2181500500014 (R,21790001,T.C.Randle+,J,PRS/A,213,392,1952) 2181500500015 (R,21365001,T.C.Randle+,J,PPS/A,69,760,1956) 2181500500016 (R,11036001,E.Kelly+,J,PR,79,96,1950) 2181500500017 ERR-ANALYS (DATA-ERR) The uncertainty include the errors arising 2181500500018 from the interpolation as well as the errors quoted by 2181500500019 the authors in the articles. 2181500500020 STATUS (TABLE) Table 2 of Proc.Phys.Soc.(London),71(1958)305 2181500500021 HISTORY (20211227A) SD 2181500500022 ENDBIB 20 0 2181500500023 COMMON 1 3 2181500500024 ANG 2181500500025 ADEG 2181500500026 62.5 2181500500027 ENDCOMMON 3 0 2181500500028 DATA 3 12 2181500500029 EN DATA DATA-ERR 2181500500030 MEV MB/SR MB/SR 2181500500031 55. 18.0 2.0 2181500500032 65. 15.6 1.5 2181500500033 75. 13.5 1.0 2181500500034 85. 11.7 0.7 2181500500035 95. 10.1 0.5 2181500500036 105. 8.8 0.6 2181500500037 115. 7.6 0.7 2181500500038 125. 6.7 0.7 2181500500039 135. 5.9 0.7 2181500500040 145. 5.2 0.7 2181500500041 155. 4.8 0.7 2181500500042 165. 4.4 2.0 2181500500043 ENDDATA 14 0 2181500500044 ENDSUBENT 43 0 2181500599999 ENDENTRY 5 0 2181599999999