ENTRY 23052 20131215 22382305200000001 SUBENT 23052001 20131215 22382305200100001 BIB 16 56 2305200100002 TITLE The 10-B(n,alpha0)/10-B(n,alpha1-gamma) branching 2305200100003 ratio 2305200100004 AUTHOR (F.-J.Hambsch, I.Ruskov) 2305200100005 INSTITUTE (2ZZZGEL) Hambsch, corresponding author, 2305200100006 Email: franz-josef.hambsch@ec.europa.eu. European 2305200100007 Commission, Joint Research Centre, Institute of 2305200100008 Reference Materials and Measurements. 2305200100009 (3BULBLA) Ruskov, Institute for Nuclear Research 2305200100010 and Nuclear Energy, Sofia, Bulgaria 2305200100011 REFERENCE (J,NSE,156,103,2007) Main reference, data tables 2305200100012 and graphs are given. 2305200100013 REL-REF (I,,A.Benussan+,J,NIM,155,11,1978) GELINA: A Modern 2305200100014 Accelerator for High-Resolution Neutron Time-of- 2305200100015 Flight Experiments. 2305200100016 FACILITY (LINAC,2ZZZGEL) Pulsed Geel linear accelerator - 2305200100017 GELINA. Beam energy is 100 MeV, averaged current 2305200100018 60 microAmp. Compressed 4 ns, 32 ns, 256 ns electron 2305200100019 bursts duration, repetition rate 800 Hz 2305200100020 INC-SOURCE (PHOTO) 2305200100021 INC-SPECT .Pulsed white-spectrum neutron beam. The capture and 2305200100022 scattering resonances of the Bi and Pb filters served 2305200100023 as an intrinsic energy calibration of the collected 2305200100024 TOF spectra. In this way the neutron energy was 2305200100025 calibrated using transmission resonances from 0.8 up 2305200100026 to 510 keV. 2305200100027 PART-DET (A,3-LI-7) 2305200100028 DETECTOR (IOCH) Double Frisch gridded ionization chamber "TEFIG"2305200100029 operated as a flow chamber at 0.67 x 10**5 Pa with 2305200100030 95% argon + 5% C-O2 2305200100031 .Ionization chamber was covered with 5 mm thick cadmium2305200100032 sheet for low-energy neutron absorption. 2305200100033 METHOD (TOF) Time-of-flight, flight base is 28.24 m and 2305200100034 57.41 m. 2305200100035 (STTA) The two samples were mounted in a back-to-back 2305200100036 geometry on the common cathode of the ionization 2305200100037 chamber 2305200100038 (FNB) Cadmium filter 5 mm thick used for suppression 2305200100039 of low-energy neutrons < 0.4 eV. Bi and Pb filters to 2305200100040 reduce gamma ray flash. 10-B filter 0.0416 atoms/b 2305200100041 was used to prevent overlap from neutrons generated 2305200100042 in the previous bursts. 2305200100043 MONITOR .Direct measurement of branching ratio. By compiler 2305200100044 EN-SEC (E-LVL-DN,3-LI-7) Li-7 Energy level in denominator, 2305200100045 ground state 2305200100046 (E-LVL-NM,3-LI-7) Li-7 energy level in nominator, 2305200100047 1st excited state 2305200100048 SAMPLE .Two boron samples, thickness (14.5+-0.8) and (15.7 2305200100049 +-0.8) microgram/cm2, diameter 84 mm evaporated on 2305200100050 0.3 mm thick tantalum backing 100 mm in diameter. 2305200100051 (5-B-10,ENR=0.94) 2305200100052 ERR-ANALYS (DATA-ERR) Includes statistical and systematic errors 2305200100053 HISTORY (20090824C) S.M. 2305200100054 (20091024A) Re-compiled 2305200100055 (20131215A) SD: Part of data removed from Subents 2,3 2305200100056 according to remark from Dr.F.-J.Hambsch. Author's 2305200100057 name corrected. 2305200100058 ENDBIB 56 0 2305200100059 COMMON 2 3 2305200100060 E-LVL-NM E-LVL-DN 2305200100061 KEV KEV 2305200100062 0. 478. 2305200100063 ENDCOMMON 3 0 2305200100064 ENDSUBENT 63 0 2305200199999 SUBENT 23052002 20131215 22382305200200001 BIB 6 11 2305200200002 REACTION 1((5-B-10(N,A)3-LI-7,PAR,IPA)// 2305200200003 (5-B-10(N,A)3-LI-7,PAR,IPA)) 2305200200004 2((5-B-10(N,A)3-LI-7,PAR,IPA)// 2305200200005 (5-B-10(N,A)3-LI-7,PAR,IPA)) 2305200200006 METHOD 1(TOF) Flight path 28.24 m 2305200200007 2(TOF) Flight path 57.41 m 2305200200008 ANALYSIS (INTAD) Legendre fit 2305200200009 ADD-RES (COMP) Compared with ENDF-B/VI Evaluation 2305200200010 STATUS (TABLE) Table II and III of NSE,156,103,2007 2305200200011 HISTORY (20131215A) SD: Data points between 1.05 MeV - 1.95 MeV2305200200012 for REACTION (2) removed (insufficient statistics) 2305200200013 ENDBIB 11 0 2305200200014 NOCOMMON 0 0 2305200200015 DATA 8 64 2305200200016 ANG-CM-MIN ANG-CM-MAX EN EN-ERR DATA-CM 1DATA-ERR 12305200200017 DATA-CM 2DATA-ERR 2 2305200200018 ADEG ADEG KEV KEV NO-DIM NO-DIM 2305200200019 NO-DIM NO-DIM 2305200200020 0. 90. 0.7 0.3 0.064 0.0012305200200021 2305200200022 0. 90. 1.5 0.5 0.065 0.0012305200200023 0.068 0.007 2305200200024 0. 90. 2.5 0.5 0.067 0.0012305200200025 0.067 0.010 2305200200026 0. 90. 4. 1. 0.067 0.0012305200200027 0.068 0.010 2305200200028 0. 90. 7.5 2.5 0.063 0.0012305200200029 0.065 0.009 2305200200030 0. 90. 15. 5. 0.062 0.0012305200200031 0.069 0.010 2305200200032 0. 90. 30. 10. 0.066 0.0012305200200033 2305200200034 0. 90. 40. 20. 2305200200035 0.071 0.010 2305200200036 0. 90. 50. 10. 0.067 0.0022305200200037 2305200200038 0. 90. 80. 20. 0.076 0.0022305200200039 0.084 0.012 2305200200040 0. 90. 120. 20. 0.084 0.0022305200200041 0.10 0.02 2305200200042 0. 90. 160. 20. 0.095 0.0032305200200043 0.11 0.02 2305200200044 0. 90. 200. 20. 0.102 0.0032305200200045 0.09 0.02 2305200200046 0. 90. 240. 20. 0.113 0.0032305200200047 0.12 0.02 2305200200048 0. 90. 280. 20. 0.115 0.0042305200200049 0.14 0.02 2305200200050 0. 90. 320. 20. 0.121 0.0042305200200051 0.14 0.02 2305200200052 0. 90. 360. 20. 0.119 0.0042305200200053 0.14 0.02 2305200200054 0. 90. 400. 20. 0.119 0.0042305200200055 0.14 0.02 2305200200056 0. 90. 440. 20. 0.128 0.0042305200200057 0.15 0.02 2305200200058 0. 90. 480. 20. 0.139 0.0042305200200059 0.15 0.02 2305200200060 0. 90. 520. 20. 0.157 0.0042305200200061 0.18 0.02 2305200200062 0. 90. 560. 20. 0.16 0.012305200200063 0.17 0.02 2305200200064 0. 90. 600. 20. 0.20 0.012305200200065 0.22 0.02 2305200200066 0. 90. 640. 20. 0.20 0.012305200200067 0.17 0.02 2305200200068 0. 90. 680. 20. 0.24 0.012305200200069 0.22 0.03 2305200200070 0. 90. 720. 20. 0.28 0.012305200200071 0.22 0.03 2305200200072 0. 90. 760. 20. 0.29 0.012305200200073 0.26 0.03 2305200200074 0. 90. 800. 20. 0.34 0.022305200200075 0.24 0.03 2305200200076 0. 90. 840. 20. 0.38 0.022305200200077 0.36 0.05 2305200200078 0. 90. 880. 20. 0.41 0.022305200200079 0.35 0.05 2305200200080 0. 90. 920. 20. 0.45 0.032305200200081 0.38 0.05 2305200200082 0. 90. 960. 20. 0.52 0.032305200200083 0.5 0.1 2305200200084 90. 180. 0.7 0.3 0.065 0.0012305200200085 2305200200086 90. 180. 1.5 0.5 0.064 0.0012305200200087 0.065 0.007 2305200200088 90. 180. 2.5 0.5 0.063 0.0012305200200089 0.064 0.009 2305200200090 90. 180. 4. 1. 0.066 0.0012305200200091 0.067 0.010 2305200200092 90. 180. 7.5 2.5 0.064 0.0012305200200093 0.068 0.009 2305200200094 90. 180. 15. 5. 0.061 0.0012305200200095 0.065 0.010 2305200200096 90. 180. 30. 10. 0.061 0.0012305200200097 2305200200098 90. 180. 40. 20. 2305200200099 0.065 0.010 2305200200100 90. 180. 50. 10. 0.065 0.0022305200200101 2305200200102 90. 180. 80. 20. 0.058 0.0022305200200103 0.059 0.013 2305200200104 90. 180. 120. 20. 0.068 0.0022305200200105 0.05 0.01 2305200200106 90. 180. 160. 20. 0.083 0.0032305200200107 0.07 0.02 2305200200108 90. 180. 200. 20. 0.112 0.0032305200200109 0.12 0.02 2305200200110 90. 180. 240. 20. 0.157 0.0042305200200111 0.14 0.02 2305200200112 90. 180. 280. 20. 0.187 0.0052305200200113 0.18 0.03 2305200200114 90. 180. 320. 20. 0.222 0.0062305200200115 0.23 0.03 2305200200116 90. 180. 360. 20. 0.288 0.0082305200200117 0.29 0.04 2305200200118 90. 180. 400. 20. 0.39 0.012305200200119 0.28 0.04 2305200200120 90. 180. 440. 20. 0.59 0.022305200200121 0.43 0.06 2305200200122 90. 180. 480. 20. 0.91 0.032305200200123 0.9 0.1 2305200200124 90. 180. 520. 20. 1.18 0.032305200200125 0.9 0.1 2305200200126 90. 180. 560. 20. 1.77 0.072305200200127 1.3 0.2 2305200200128 90. 180. 600. 20. 1.06 0.042305200200129 1.3 0.2 2305200200130 90. 180. 640. 20. 1.08 0.052305200200131 1.2 0.1 2305200200132 90. 180. 680. 20. 0.95 0.042305200200133 1.0 0.1 2305200200134 90. 180. 720. 20. 0.95 0.042305200200135 1.0 0.1 2305200200136 90. 180. 760. 20. 0.91 0.052305200200137 0.9 0.1 2305200200138 90. 180. 800. 20. 0.90 0.052305200200139 0.9 0.1 2305200200140 90. 180. 840. 20. 1.06 0.062305200200141 1.1 0.1 2305200200142 90. 180. 880. 20. 0.91 0.062305200200143 0.8 0.1 2305200200144 90. 180. 920. 20. 1.11 0.072305200200145 0.9 0.1 2305200200146 90. 180. 960. 20. 1.02 0.072305200200147 1.2 0.2 2305200200148 ENDDATA 132 0 2305200200149 ENDSUBENT 148 0 2305200299999 SUBENT 23052003 20131215 22382305200300001 BIB 6 12 2305200300002 REACTION 1((5-B-10(N,A)3-LI-7,PAR,SIG)// 2305200300003 (5-B-10(N,A)3-LI-7,PAR,SIG)) 2305200300004 2((5-B-10(N,A)3-LI-7,PAR,SIG)// 2305200300005 (5-B-10(N,A)3-LI-7,PAR,SIG)) Branching Ratio R,2305200300006 10-B(n,a0)/10-B(n,a1gamma) 2305200300007 METHOD 1(TOF) Flight path 28.24 m 2305200300008 2(TOF) Flight path 57.41 m. 2305200300009 ANALYSIS (INTAD) Legendre fit 2305200300010 ADD-RES (COMP) Compared with ENDF-B/VI Evaluation 2305200300011 STATUS (TABLE) Tables II and III of NSE,156,103,2007 2305200300012 HISTORY (20131215A) SD: Data points between 1.05 MeV - 1.95 MeV2305200300013 for REACTION (2) removed (insufficient statistics) 2305200300014 ENDBIB 12 0 2305200300015 NOCOMMON 0 0 2305200300016 DATA 6 32 2305200300017 EN EN-ERR DATA-CM 1DATA-ERR 1DATA-CM 2DATA-ERR 22305200300018 KEV KEV NO-DIM NO-DIM NO-DIM NO-DIM 2305200300019 0.7 0.3 0.064 0.001 2305200300020 1.5 0.5 0.065 0.001 0.067 0.0052305200300021 2.5 0.5 0.065 0.001 0.065 0.0072305200300022 4. 1. 0.066 0.001 0.067 0.0072305200300023 7.5 2.5 0.064 0.001 0.066 0.0072305200300024 15. 5. 0.061 0.001 0.067 0.0072305200300025 30. 10. 0.063 0.001 2305200300026 40. 20. 0.068 0.0072305200300027 50. 10. 0.066 0.001 2305200300028 80. 20. 0.067 0.001 0.070 0.0092305200300029 120. 20. 0.076 0.002 0.08 0.012305200300030 160. 20. 0.089 0.002 0.09 0.012305200300031 200. 20. 0.107 0.002 0.11 0.012305200300032 240. 20. 0.133 0.003 0.13 0.022305200300033 280. 20. 0.147 0.003 0.16 0.022305200300034 320. 20. 0.164 0.003 0.18 0.022305200300035 360. 20. 0.190 0.004 0.20 0.022305200300036 400. 20. 0.215 0.004 0.19 0.022305200300037 440. 20. 0.260 0.005 0.25 0.022305200300038 480. 20. 0.295 0.005 0.32 0.032305200300039 520. 20. 0.38 0.01 0.34 0.032305200300040 560. 20. 0.40 0.01 0.37 0.032305200300041 600. 20. 0.41 0.01 0.42 0.032305200300042 640. 20. 0.42 0.01 0.38 0.032305200300043 680. 20. 0.42 0.01 0.39 0.032305200300044 720. 20. 0.49 0.02 0.42 0.042305200300045 760. 20. 0.46 0.02 0.44 0.042305200300046 800. 20. 0.51 0.02 0.43 0.042305200300047 840. 20. 0.62 0.02 0.59 0.052305200300048 880. 20. 0.57 0.02 0.53 0.052305200300049 920. 20. 0.66 0.03 0.56 0.052305200300050 960. 20. 0.71 0.03 0.7 0.12305200300051 ENDDATA 34 0 2305200300052 ENDSUBENT 51 0 2305200399999 SUBENT 23052004 20091024 22162305200400001 BIB 5 10 2305200400002 REACTION 1((5-B-10(N,A)3-LI-7,PAR,IPA)// 2305200400003 (5-B-10(N,A)3-LI-7,PAR,IPA)) 2305200400004 2((5-B-10(N,A)3-LI-7,PAR,IPA)// 2305200400005 (5-B-10(N,A)3-LI-7,PAR,IPA)) Branching Ratio R, 2305200400006 10-B(n,a0)/10-B(n,a1gamma) 2305200400007 METHOD 1(TOF) Flight path 28.24 m 2305200400008 2(TOF) Flight path 57.41 m. 2305200400009 ANALYSIS (INTAD) Legendre fit 2305200400010 ADD-RES (COMP) Compared with ENDF-B/VI Evaluation 2305200400011 STATUS (TABLE) Tables II and III of main reference 2305200400012 ENDBIB 10 0 2305200400013 NOCOMMON 0 0 2305200400014 DATA 7 4 2305200400015 ANG-CM-MIN ANG-CM-MAX EN-MAX DATA-CM 1DATA-ERR 1DATA-CM 22305200400016 DATA-ERR 2 2305200400017 ADEG ADEG KEV NO-DIM NO-DIM NO-DIM 2305200400018 NO-DIM 2305200400019 0. 90. 0.4 0.064 0.001 2305200400020 2305200400021 0. 90. 1. 0.067 2305200400022 0.002 2305200400023 90. 180. 0.4 0.066 0.001 2305200400024 2305200400025 90. 180. 1. 0.066 2305200400026 0.002 2305200400027 ENDDATA 12 0 2305200400028 ENDSUBENT 27 0 2305200499999 SUBENT 23052005 20091024 22162305200500001 BIB 5 10 2305200500002 REACTION 1((5-B-10(N,A)3-LI-7,PAR,SIG)// 2305200500003 (5-B-10(N,A)3-LI-7,PAR,SIG)) 2305200500004 2((5-B-10(N,A)3-LI-7,PAR,SIG)// 2305200500005 (5-B-10(N,A)3-LI-7,PAR,SIG)) Branching Ratio R, 2305200500006 10-B(n,a0)/10-B(n,a1gamma) 2305200500007 METHOD 1(TOF) Flight path 28.24 m. 2305200500008 2(TOF) Flight path 57.41 m. 2305200500009 ANALYSIS (INTAD) Legendre fit 2305200500010 ADD-RES (COMP) Compared with ENDF-B/VI Evaluation 2305200500011 STATUS (TABLE) Tables II and III of main reference 2305200500012 ENDBIB 10 0 2305200500013 NOCOMMON 0 0 2305200500014 DATA 5 2 2305200500015 EN-MAX DATA-CM 1DATA-ERR 1DATA-CM 2DATA-ERR 2 2305200500016 KEV NO-DIM NO-DIM NO-DIM NO-DIM 2305200500017 0.4 0.065 0.001 2305200500018 1. 0.066 0.001 2305200500019 ENDDATA 4 0 2305200500020 ENDSUBENT 19 0 2305200599999 ENDENTRY 5 0 2305299999999