ENTRY C2717 20220118 C212C271700000001 SUBENT C2717001 20220118 C212C271700100001 BIB 11 21 C271700100002 TITLE Energy spectrum of Po-Be neutrons C271700100003 AUTHOR (H.T.Richards,Pfc.L.Speck) C271700100004 REFERENCE (R,LA-111,1944) C271700100005 REL-REF (M,14727001,H.T.Richards+,R,LA-60,1944) Neutron C271700100006 energy measurements by the emulsion technique. C271700100007 INSTITUTE (1USALAS) C271700100008 INC-SOURCE Decay alphas from 210Po C271700100009 DETECTOR (PLATE) 160 micron thick Ilford Halftone emulsions. C271700100010 METHOD (REC) Recoil protons in photographic emulsions have C271700100011 being used to measure the energy distribution of the C271700100012 neutrons from a Po-Be source. 1000 recoil proton C271700100013 tracks on these plates have been measured. C271700100014 CORRECTION Corrected for n-p scattering and geometry. C271700100015 COMMENT Compiler's comment: Po-Be source is driven by the C271700100016 210Po(T1/2=138 days) with an alpha decay energy 5.4 C271700100017 MeV. Alpha particles interact with 9Be and produce C271700100018 12C by emitting neutrons and gamma-rays (excited C271700100019 states in 12C). 9Be(alpha,n) reaction Q-value is 5.7 C271700100020 MeV; therefore, neutrons with energies up to 11.1 MeV C271700100021 are generated. C271700100022 HISTORY (20220118C) BP C271700100023 ENDBIB 21 0 C271700100024 COMMON 1 3 C271700100025 EN C271700100026 MEV C271700100027 5.40753 C271700100028 ENDCOMMON 3 0 C271700100029 ENDSUBENT 28 0 C271700199999 SUBENT C2717002 20220118 C212C271700200001 BIB 3 3 C271700200002 REACTION (4-BE-9(A,N)6-C-12,,DE,,REL) C271700200003 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C271700200004 STATUS (CURVE) Fig. 1, page 6. C271700200005 ENDBIB 3 0 C271700200006 NOCOMMON 0 0 C271700200007 DATA 3 46 C271700200008 E DATA DATA-ERR C271700200009 MEV ARB-UNITS ARB-UNITS C271700200010 0.906 19.964 5.396 C271700200011 1.116 52.878 7.554 C271700200012 1.310 75.000 10.791 C271700200013 1.519 101.439 11.871 C271700200014 1.714 131.115 13.489 C271700200015 1.926 188.309 18.345 C271700200016 2.151 236.331 20.504 C271700200017 2.347 273.561 22.662 C271700200018 2.538 266.007 23.741 C271700200019 2.742 260.072 24.281 C271700200020 2.933 248.741 22.662 C271700200021 3.136 231.475 24.281 C271700200022 3.327 219.065 24.281 C271700200023 3.502 198.022 22.122 C271700200024 3.713 242.806 27.518 C271700200025 3.912 189.928 24.820 C271700200026 4.098 137.050 20.504 C271700200027 4.277 143.525 20.504 C271700200028 4.495 133.273 23.741 C271700200029 4.703 155.935 24.281 C271700200030 4.907 139.209 23.741 C271700200031 5.080 99.281 19.424 C271700200032 5.302 125.180 23.201 C271700200033 5.496 140.288 24.820 C271700200034 5.684 113.309 24.820 C271700200035 5.887 90.108 20.504 C271700200036 6.076 67.446 20.504 C271700200037 6.285 94.424 24.820 C271700200038 6.493 120.324 26.439 C271700200039 6.713 120.324 27.518 C271700200040 6.899 190.468 32.914 C271700200041 7.114 156.475 31.295 C271700200042 7.289 127.338 30.755 C271700200043 7.523 137.590 32.914 C271700200044 7.693 69.065 22.662 C271700200045 7.890 116.007 30.216 C271700200046 8.301 117.086 32.374 C271700200047 8.505 104.137 37.770 C271700200048 8.694 80.396 28.597 C271700200049 8.885 76.079 29.676 C271700200050 9.076 67.986 25.899 C271700200051 9.291 26.439 15.108 C271700200052 9.495 14.029 11.871 C271700200053 9.882 46.403 25.360 C271700200054 10.103 60.971 29.137 C271700200055 10.276 17.806 16.727 C271700200056 ENDDATA 48 0 C271700200057 ENDSUBENT 56 0 C271700299999 SUBENT C2717003 20220118 C212C271700300001 BIB 3 4 C271700300002 REACTION (4-BE-9(A,N)6-C-12,,KE,N) C271700300003 ANALYSIS A method of visual inspection. C271700300004 STATUS (DEP,C2717002) C271700300005 (TABLE) page 5. C271700300006 ENDBIB 4 0 C271700300007 NOCOMMON 0 0 C271700300008 DATA 1 1 C271700300009 DATA-APRX C271700300010 MEV C271700300011 4.1 C271700300012 ENDDATA 3 0 C271700300013 ENDSUBENT 12 0 C271700399999 ENDENTRY 3 0 C271799999999