ENTRY 22068 20211230 23062206800000001 SUBENT 22068001 20211230 23062206800100001 BIB 16 78 2206800100002 TITLE Measurement of B-10(n,t)2alpha reaction cross section 2206800100003 in the energy range of 2.5 to 10.6 MeV: diffusion of 2206800100004 tritium in boron carbide. 2206800100005 AUTHOR (A.Suhaimi,R.Woelfe,S.M.Qaim,G.Stoecklin) 2206800100006 REFERENCE (J,RCA,40,113,1986) 2206800100007 (R,JUEL-2196,1988) - same dataset 2206800100008 REL-REF (O,22102001,A.Suhaimi+,J,RCA,43,133,1988) 2206800100009 14N(n,t)12C and 9Be(n,t)7Li reactions 2206800100010 INSTITUTE (2GERJUL) 2206800100011 FACILITY (CYCLO,2GERJUL) Variable energy compact cyclotron CV28.2206800100012 INC-SOURCE (D-D) Deuterium gas target, 37 milli-m long. 2206800100013 Deuteron energies between 3.0 and 8 MeV, beam current 2206800100014 of 4 micro-Amps. 2206800100015 Neutron energy range 2.5 to 10.6 MeV. 2206800100016 Sample irradiation time between 2 and 12 hours. 2206800100017 METHOD (ACTIV) The tritium produced in each sample was 2206800100018 separated in a vacuum apparatus at 1150 C and its 2206800100019 activity determined in an anticoincidence proportional2206800100020 gas counter. Cross sections were determined relative 2206800100021 to activation monitor reaction cross sections. 2206800100022 DETECTOR (PROPC) Anticoincidence proportional gas counter, with 2206800100023 an efficiency of 65% 2206800100024 (GELI) Activation from monitor foils were detected 2206800100025 with a Ge(Li) gamma spectrometer. 2206800100026 RAD-DET (1-H-3,B-) 2206800100027 MONITOR (26-FE-54(N,P)25-MN-54,,SIG) 2206800100028 (28-NI-58(N,P)27-CO-58,,SIG) 2206800100029 SAMPLE B-10 sample, enrichment 94.35%, chemical 2206800100030 purity 99.998%, grain size less than 420 um. 2206800100031 Nominal dimensions 15 milli-m diameter by 2206800100032 6 milli-m thick. Distance between gas target beam 2206800100033 stop and sample front end 6.5 milli-m. Sample weight 2206800100034 about 1 g. 2206800100035 Boron carbide (B4C), natural isotopic composition, 2206800100036 technical grade, grain size less than 250 um. 2206800100037 Nominal dimensions 24.5 milli-m diameter by 21.2 2206800100038 milli-m thick. Distance between gas target beam stop 2206800100039 and sample front end 10 milli-m. Sample weight about 2206800100040 12 g. 2206800100041 Two monitor foils, iron and nickel, each 250 um 2206800100042 thick, were placed on either side of each sample. 2206800100043 CORRECTION In the tritium counting measurements were corrected 2206800100044 for tritium loss during heating, for residual tritium 2206800100045 content in the samples and for neutron background. 2206800100046 In the monitor foil measurements, corrections were 2206800100047 applied for dead time, pile up, coincidence losses, 2206800100048 decay and gamma-ray abundance, as well as for back- 2206800100049 ground neutrons. 2206800100050 ERR-ANALYS (ERR-T) Total errors, composed of the following 2206800100051 contributions. 2206800100052 (ERR-1) Uncertainty in weight of monitors and foils 2206800100053 (ERR-2) Uncertainty in irradiation time 2206800100054 (ERR-3,1.,2.) Uncertainty in half-life dependent 2206800100055 effects 2206800100056 (ERR-4) Uncertainty in neutron source characteristics 2206800100057 (ERR-5) Uncertainty in irradiation geometry 2206800100058 (ERR-6,1.,15.) Uncertainty in correction for activity 2206800100059 induced by background neutrons (gas out/in, breakup) 2206800100060 (ERR-7) Uncertainty in correction for absorption and 2206800100061 scattering of neutrons in the sample 2206800100062 (ERR-8) Error in excitation function of monitor 2206800100063 reaction 2206800100064 (ERR-9,4.,6.) Uncertainty in determination of detector 2206800100065 counts 2206800100066 (ERR-10,,1.) Uncertainty in absorption of gamma-ray in 2206800100067 the monitors 2206800100068 (ERR-11) Uncertainty in efficiency of the gamma 2206800100069 detector 2206800100070 (ERR-12) Uncertainty in efficiency of gas counting tube2206800100071 (ERR-13) Uncertainty in separation yield 2206800100072 (ERR-14,1.,4.) Uncertainty in stopping power/gas 2206800100073 filled target 2206800100074 (ERR-15) Uncertainty of plateau 2206800100075 STATUS (TABLE) Uncertainties from Tbl.8 of JUEL-2196 2206800100076 HISTORY (19871026C) N.O. 2206800100077 (20211230A) SD:Updated to new date formats,lower case. 2206800100078 Subents 002 and 003 merged. DATA-ERR -> ERR-T. 2206800100079 Ref. JUEL-2196 added. ERR-ANALYS updated. 2206800100080 ENDBIB 78 0 2206800100081 COMMON 10 6 2206800100082 ERR-1 ERR-2 ERR-4 ERR-5 ERR-7 ERR-8 2206800100083 ERR-11 ERR-12 ERR-13 ERR-15 2206800100084 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2206800100085 PER-CENT PER-CENT PER-CENT PER-CENT 2206800100086 0.1 0.1 3. 3. 5. 8. 2206800100087 3. 4. 4. 3. 2206800100088 ENDCOMMON 6 0 2206800100089 ENDSUBENT 88 0 2206800199999 SUBENT 22068002 20211230 23062206800200001 BIB 5 9 2206800200002 REACTION (5-B-10(N,T+A)2-HE-4,,SIG) 2206800200003 FLAG (1.) Enriched B-10 sample. 2206800200004 (2.) B4C sample. 2206800200005 MONITOR (28-NI-58(N,P)27-CO-58,,SIG) 2206800200006 (26-FE-54(N,P)25-MN-54,,SIG) 2206800200007 STATUS (TABLE) Tbl. 1 from Radiochimica Acta 40(1986)113; 2206800200008 same data are given in Tbl.9 of JUEL-2196 2206800200009 HISTORY (20211229A) SD: Data from Subent 003 added. 2206800200010 DATA-ERR -> ERR-T. 2206800200011 ENDBIB 9 0 2206800200012 NOCOMMON 0 0 2206800200013 DATA 5 24 2206800200014 EN EN-RSL DATA ERR-T FLAG 2206800200015 MEV MEV MB MB NO-DIM 2206800200016 2.56 0.26 39. 5. 1. 2206800200017 3.38 0.22 81. 11. 2. 2206800200018 3.48 0.31 82. 11. 1. 2206800200019 3.91 0.26 147. 19. 2. 2206800200020 4.42 0.20 152. 20. 2. 2206800200021 4.60 0.20 168. 22. 1. 2206800200022 4.73 0.17 195. 25. 2. 2206800200023 5.26 0.17 209. 27. 1. 2206800200024 5.28 0.17 215. 28. 2. 2206800200025 5.88 0.17 202. 26. 2. 2206800200026 6.43 0.18 186. 25. 2. 2206800200027 6.44 0.18 176. 24. 2. 2206800200028 6.98 0.18 176. 24. 2. 2206800200029 7.51 0.19 179. 25. 2. 2206800200030 8.01 0.21 147. 21. 2. 2206800200031 8.02 0.22 139. 20. 1. 2206800200032 8.02 0.22 135. 19. 2. 2206800200033 8.52 0.23 128. 19. 1. 2206800200034 8.54 0.18 135. 20. 2. 2206800200035 9.00 0.24 119. 22. 1. 2206800200036 9.52 0.22 114. 23. 2. 2206800200037 9.57 0.18 112. 23. 1. 2206800200038 10.09 0.26 97. 13. 1. 2206800200039 10.57 0.27 108. 14. 1. 2206800200040 ENDDATA 26 0 2206800200041 ENDSUBENT 40 0 2206800299999 NOSUBENT 22068003 20211230 23062206800300001 ENDENTRY 3 0 2206899999999