ENTRY 11235 20201028 14741123500000001 SUBENT 11235001 20201028 14741123500100001 BIB 6 13 1123500100002 TITLE Cross sections for the B11(n, gamma)B12 reaction 1123500100003 AUTHOR (W.L.Imhof,R.G.Johnson,F.J.Vaughn,M.Walt) 1123500100004 REFERENCE (J,PR,125,1334,1962) 1123500100005 #doi:10.1103/PhysRev.125.1334 1123500100006 (W,IMHOF,1963) 1123500100007 INSTITUTE (1USALMS) 1123500100008 FACILITY (VDG,1USALMS) 3 Mev Van de Graaff generator. 1123500100009 HISTORY (19760629T) Translated from SCISRS. 1123500100010 (19800820A) converted to reaction formalism. 1123500100011 (20201028A) BP: Verified entry using a private 1123500100012 communication from Imhof. Updated to new date formats, 1123500100013 lower case. Corrections according latest EXFOR rules 1123500100014 and Dict. 1123500100015 ENDBIB 13 0 1123500100016 NOCOMMON 0 0 1123500100017 ENDSUBENT 16 0 1123500199999 SUBENT 11235002 20201028 14741123500200001 BIB 8 20 1123500200002 REACTION (5-B-0(N,TOT),,SIG) 1123500200003 SAMPLE The total cross section sample consisted of boron 1123500200004 powder packed in a 2.54 cm diameter tantalum cylinder 1123500200005 with a wall thickness of 0.014 cm. 1123500200006 DETECTOR (SCIN) Plastic scintillator having a diameter of 5.08 1123500200007 cm and a length of 2.54 cm. 1123500200008 METHOD (TOF) Time of flight discrimination was used. The 1123500200009 neutrons were detected by a plastic scintillator 1123500200010 which was placed in the collimator at a distance of 1123500200011 92 cm from the boron sample. An identical tantalum 1123500200012 cylinder containing no boron was used to determine 1123500200013 the "sample-out" counts. 1123500200014 ERR-ANALYS (ERR-S) Statistical error in all total cross 1123500200015 sections for E=950-1095 keV is approximately +-0.09 b. 1123500200016 CORRECTION In-scattering corrections of about 0.5% of 1123500200017 the cross section were applied to the data. 1123500200018 STATUS (TABLE) Tabulated data from a private communication. 1123500200019 HISTORY (20201028A) BP: Added sample, detector, method, 1123500200020 correction, uncertainties and status, corrected neutron1123500200021 energy values. 1123500200022 ENDBIB 20 0 1123500200023 COMMON 1 3 1123500200024 EN-RSL 1123500200025 KEV 1123500200026 4.0 1123500200027 ENDCOMMON 3 0 1123500200028 DATA 3 47 1123500200029 EN DATA ERR-S 1123500200030 MEV B B 1123500200031 0.9501 1.841 0.09 1123500200032 0.9599 1.709 0.09 1123500200033 0.9686 1.825 0.09 1123500200034 0.9739 1.671 0.09 1123500200035 0.9787 1.608 0.09 1123500200036 0.985 1.679 0.09 1123500200037 0.9895 1.484 0.09 1123500200038 0.9947 1.382 0.09 1123500200039 0.9997 1.698 0.09 1123500200040 1.0045 1.454 0.09 1123500200041 1.009 1.452 0.09 1123500200042 1.0125 1.436 0.09 1123500200043 1.0148 1.240 0.09 1123500200044 1.017 1.399 0.09 1123500200045 1.019 1.313 0.09 1123500200046 1.0204 1.181 0.09 1123500200047 1.0216 1.145 0.09 1123500200048 1.0227 1.247 0.09 1123500200049 1.024 1.181 0.09 1123500200050 1.025 1.291 0.09 1123500200051 1.026 1.560 0.09 1123500200052 1.0277 1.565 0.09 1123500200053 1.030 1.741 0.09 1123500200054 1.0321 1.697 0.09 1123500200055 1.0339 1.817 0.09 1123500200056 1.0351 1.831 0.09 1123500200057 1.0367 1.817 0.09 1123500200058 1.0387 1.710 0.09 1123500200059 1.0405 1.808 0.09 1123500200060 1.0423 1.829 0.09 1123500200061 1.0468 1.814 0.09 1123500200062 1.0517 1.834 0.09 1123500200063 1.0554 1.742 0.09 1123500200064 1.067 1.876 0.09 1123500200065 1.081 1.991 0.09 1123500200066 1.095 1.833 0.09 1123500200067 1.125 2.280 1123500200068 1.150 2.304 1123500200069 1.175 2.723 1123500200070 1.200 2.959 1123500200071 1.225 3.395 1123500200072 1.250 3.896 1123500200073 1.250 3.941 1123500200074 1.275 4.289 1123500200075 1.300 4.142 1123500200076 1.325 3.736 1123500200077 1.350 3.257 1123500200078 ENDDATA 49 0 1123500200079 ENDSUBENT 78 0 1123500299999 SUBENT 11235003 20201028 14741123500300001 BIB 4 6 1123500300002 REACTION 1(5-B-11(N,0),,EN) 1123500300003 2(5-B-11(N,G),,WID) 1123500300004 ERR-ANALYS (DATA-ERR) Estimated uncertainty. 1123500300005 STATUS (DEP,11235005) 1123500300006 (TABLE) Page 1336 of J,PR,125,1334,1962. 1123500300007 HISTORY (20201028A) BP: Updated uncertainties and status. 1123500300008 ENDBIB 6 0 1123500300009 NOCOMMON 0 0 1123500300010 DATA 3 4 1123500300011 DATA 1DATA 2DATA-ERR 2 1123500300012 MEV MILLI-EV PER-CENT 1123500300013 4.30E-01 3.00E+05 50.0 1123500300014 1.027 3.00E+05 50.0 1123500300015 1.280 2.00E+05 50.0 1123500300016 1.780 9.00E+05 50.0 1123500300017 ENDDATA 6 0 1123500300018 ENDSUBENT 17 0 1123500399999 SUBENT 11235004 20201028 14741123500400001 BIB 4 8 1123500400002 REACTION 1(5-B-11(N,TOT),,WID) 1123500400003 2(5-B-11(N,0),,J) 1123500400004 3(5-B-11(N,0),,L) 1123500400005 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. 1123500400006 STATUS (DEP,11235005) 1123500400007 (DEP,11235004) 1123500400008 (TABLE) Page 1336 of J,PR,125,1334,1962. 1123500400009 HISTORY (20201028A) BP: Updated uncertainties and status. 1123500400010 ENDBIB 8 0 1123500400011 NOCOMMON 0 0 1123500400012 DATA 6 1 1123500400013 EN-RES EN-RSL DATA 1DATA-ERR 1DATA 2DATA 31123500400014 MEV MEV KEV KEV NO-DIM NO-DIM 1123500400015 1.027 1.0E-02 10. 4. 1. 0.1123500400016 ENDDATA 3 0 1123500400017 ENDSUBENT 16 0 1123500499999 SUBENT 11235005 20201028 14741123500500001 BIB 9 16 1123500500002 REACTION (5-B-11(N,G)5-B-12,,SIG) 1123500500003 DETECTOR (TELES) Counter telescope 1123500500004 SAMPLE A powdered mixture of natural boron and iodine. 1123500500005 METHOD (ACTIV) Samples were bombarded with monoenergetic 1123500500006 neutrons and the resulting B12 beta-ray activity was 1123500500007 observed. The observed decrease in counting rate with 1123500500008 time indicated that the activity had a lifetime of 1123500500009 about 20 msec and served to identify it as produced 1123500500010 by the B11(n,gamma)B12 reaction. 1123500500011 MONITOR (53-I-127(N,G)53-I-128,,SIG) 1123500500012 ERR-ANALYS (ERR-S) Errors indicated are due to counting statistics1123500500013 only. Probable total error is 50%. 1123500500014 DECAY-DATA (5-B-12,20.0MSEC,B-) 1123500500015 STATUS (TABLE) Tabulated data from a private communication. 1123500500016 HISTORY (20201028A) BP: Added sample, method, decay data, 1123500500017 status and updated uncertainties. 1123500500018 ENDBIB 16 0 1123500500019 NOCOMMON 0 0 1123500500020 DATA 4 42 1123500500021 EN EN-RSL DATA ERR-S 1123500500022 MEV MEV B B 1123500500023 1.39E-01 7.00E-02 8.1E-06 0.5E-06 1123500500024 1.98E-01 7.00E-02 1.27E-05 1.0E-06 1123500500025 2.38E-01 7.00E-02 1.05E-05 2.1E-06 1123500500026 2.87E-01 7.00E-02 1.03E-05 1.8E-06 1123500500027 3.36E-01 7.00E-02 1.58E-05 1.9E-06 1123500500028 3.73E-01 7.00E-02 1.56E-05 1.3E-06 1123500500029 4.15E-01 7.00E-02 2.92E-05 1.2E-06 1123500500030 4.29E-01 7.00E-02 2.99E-05 1.6E-06 1123500500031 4.35E-01 7.00E-02 2.55E-05 1.3E-06 1123500500032 4.45E-01 7.00E-02 2.74E-05 1.3E-06 1123500500033 4.97E-01 7.00E-02 1.29E-05 0.5E-06 1123500500034 5.30E-01 7.00E-02 9.3E-06 1.0E-06 1123500500035 5.87E-01 7.00E-02 1.02E-05 0.4E-06 1123500500036 6.81E-01 7.00E-02 7.6E-06 0.6E-06 1123500500037 7.55E-01 7.00E-02 8.4E-06 1.2E-06 1123500500038 7.80E-01 7.00E-02 1.00E-05 1.1E-06 1123500500039 8.78E-01 7.00E-02 7.5E-06 1.6E-06 1123500500040 9.27E-01 7.00E-02 1.07E-05 1.2E-06 1123500500041 9.65E-01 7.00E-02 1.10E-05 1.1E-06 1123500500042 1.031 7.00E-02 1.54E-05 0.7E-06 1123500500043 1.063 7.00E-02 1.31E-05 1.1E-06 1123500500044 1.113 7.00E-02 1.05E-05 0.8E-06 1123500500045 1.170 7.00E-02 7.3E-06 0.9E-06 1123500500046 1.215 7.00E-02 7.7E-06 0.8E-06 1123500500047 1.244 7.00E-02 1.08E-05 1.2E-06 1123500500048 1.281 7.00E-02 1.00E-05 0.7E-06 1123500500049 1.332 7.00E-02 8.8E-06 0.8E-06 1123500500050 1.371 7.00E-02 7.7E-06 1.1E-06 1123500500051 1.479 7.00E-02 7.3E-06 0.7E-06 1123500500052 1.568 7.00E-02 5.7E-06 0.9E-06 1123500500053 1.640 7.00E-02 8.7E-06 1.0E-06 1123500500054 1.680 7.0E-02 8.4E-06 0.9E-06 1123500500055 1.726 2.00E-01 1.14E-05 0.7E-06 1123500500056 1.760 2.00E-01 1.24E-05 1.1E-06 1123500500057 1.796 2.00E-01 1.16E-05 0.7E-06 1123500500058 1.832 2.00E-01 9.6E-06 1.0E-06 1123500500059 1.932 2.00E-01 8.0E-06 1.0E-06 1123500500060 2.085 2.00E-01 7.9E-06 1.0E-06 1123500500061 2.180 2.00E-01 6.7E-06 0.9E-06 1123500500062 2.228 2.00E-01 1.08E-05 1.0E-06 1123500500063 2.279 2.00E-01 1.08E-05 1.0E-06 1123500500064 2.325 2.00E-01 9.9E-06 1.0E-06 1123500500065 ENDDATA 44 0 1123500500066 ENDSUBENT 65 0 1123500599999 SUBENT 11235006 20201028 14741123500600001 BIB 11 30 1123500600002 REACTION (5-B-11(N,G)5-B-12,,SIG) 1123500600003 INC-SOURCE (P-LI7) The paraffin block was bombarded with 1123500600004 neutrons produced by the Li7(p,n) Be7 reaction. 1123500600005 SAMPLE (5-B-11,ENR=0.985) For this measurement a boron 1123500600006 sample enriched to 98.5% in B11 was used. The 1123500600007 activation samples were hollow Plexiglass cylinders 1123500600008 containing powdered boron mixed with 20% w/w powdered 1123500600009 iodine. These cylinders had a wall thickness of 0.08 cm1123500600010 and were 2.54 cm in diameter and 0.5 cm in length. 1123500600011 DETECTOR (SCIN) The beta particles emitted by the B12 nuclei 1123500600012 were detected by two 2.54 cm diameter plastic 1123500600013 scintillators operated in coincidence. 1123500600014 METHOD (ACTIV,COINC) Measurements at thermal energies were 1123500600015 performed by placing the boron sample and the 1123500600016 beta-ray counter at the center of a paraffin cube 1123500600017 whose edges were 25 cm long. The reaction rate due to 1123500600018 thermal neutrons was obtained from the observed 1123500600019 difference in the counting rates from the boron 1123500600020 sample with and without a cadmium cover. 1123500600021 ANALYSIS The cross sections were calculated from the observed 1123500600022 B12 activities, the amount of B11 in the samples, and 1123500600023 the effective neutron flux striking the B11 1123500600024 activation samples. 1123500600025 MONITOR (53-I-127(N,G)53-I-128,,SIG) 1123500600026 DECAY-DATA (5-B-12,20.0MSEC,B-) 1123500600027 ERR-ANALYS (DATA-ERR) No information on sources of uncertainties 1123500600028 STATUS (TABLE) Page 1336 of J,PR,125,1334,1962. 1123500600029 HISTORY (19840605A) Data heading corrected. 1123500600030 (20201028A) BP: Added sample, method, decay data, 1123500600031 detector, analysis and status. 1123500600032 ENDBIB 30 0 1123500600033 NOCOMMON 0 0 1123500600034 DATA 4 1 1123500600035 EN DATA DATA-ERR MONIT 1123500600036 EV MB MB B 1123500600037 0.0253 5. 3. 5.6 1123500600038 ENDDATA 3 0 1123500600039 ENDSUBENT 38 0 1123500699999 ENDENTRY 6 0 1123599999999