ENTRY M0448 20220211 M119M044800000001 SUBENT M0448001 20220211 M119M044800100001 BIB 9 28 M044800100002 TITLE The absolute N-14(g,n) reaction cross section. M044800100003 AUTHOR (M.J.Facci,M.N.Thompson) M044800100004 REFERENCE (J,NP/A,465,77,1987) M044800100005 INSTITUTE (3AULAML) M044800100006 FACILITY (BETAT,3AULAML) M044800100007 INC-SOURCE (BRST) M044800100008 ERR-ANALYS (DATA-ERR) The mean-root-squared errors are given. M044800100009 COMMENT There exists significant disagreement in the M044800100010 magnitude of low-energy region of the N-14(g,n) M044800100011 cross section as measured by three methods: direct M044800100012 neutron detection, induced activity, and neutron M044800100013 time-of-flight. This paper reports two measurements M044800100014 of this reaction cross section, one from threshold M044800100015 to 16.5 mev using an activation method, and the M044800100016 other from threshold to 15.5 mev by directly M044800100017 detecting the emitted neutrons. M044800100018 HISTORY (19910218C) M044800100019 (20050609A) Corrected by V.Varlamov: M044800100020 Dates corrected from two to four digits including M044800100021 those in REFERENCE and HISTORY, lower case, page in M044800100022 REFERENCE corrected from 486 to 465. M044800100023 (20050901A) Corrected by V.Varlamov: BRA substituted M044800100024 by BRS in line REACTION of SUBENTS 002 - 005. M044800100025 (20181023A) Corrected by V.Varlamov: ERR-ANALYS, M044800100026 STATUS, ANALYSIS, PART-DET, DECAY-DATA, DATA in M044800100027 SUBENTS 002 and 003 substituted. M044800100028 (20220211A) Corrected by V.Varlamov: STATUS, PART-DET, M044800100029 REACTION. M044800100030 ENDBIB 28 0 M044800100031 NOCOMMON 0 0 M044800100032 ENDSUBENT 31 0 M044800199999 SUBENT M0448002 20220211 M119M044800200001 BIB 8 22 M044800200002 REACTION ((7-N-14(G,N)7-N-13,,SIG,,BRS)+ M044800200003 (7-N-14(G,N+P)6-C-12,,SIG,,BRS)) M044800200004 COMMENT The threshold of (g,n+p) reaction is 12.5 MeV so the M044800200005 cross section measured is really the sum of cross M044800200006 sections of (g,n) and (g,n+p) reactions. M044800200007 SAMPLE The sample consisted of 142.41 g of chemically pure M044800200008 glycine ((C-2)(H-5)(NO-2)), placed in a perspex M044800200009 container 109 mm in diameter and 104 mm long. M044800200010 METHOD (EXTB) M044800200011 DETECTOR (BF3) 4PI Halpern-type detector. M044800200012 ANALYSIS (PLA) The yields of neutrons was determined at M044800200013 bremsstrahlung energies ranging from 10.0 to 16.0 M044800200014 MeV at 100 keV intervals. A total of 26 independent M044800200015 yield curves were mesured. the cross section was M044800200016 unfolded from the measured yield curves using the M044800200017 variable bin Penfold-Leiss (VBPL) method. M044800200018 STATUS (CURVE) Data from Fig. 3 of M044800200019 Nucl.Phys.A.465(1987)77. M044800200020 HISTORY (20181023A) Corrected by V.Varlamov: STATUS, ANALYSIS, M044800200021 DATA substituted (multiplyed by 10). M044800200022 (20220211A) Corrected by V.Varlamov: PART-DET, EN-SEC, M044800200023 COMMENT, STATUS. M044800200024 ENDBIB 22 0 M044800200025 COMMON 1 3 M044800200026 ANAL-STEP M044800200027 KEV M044800200028 100. M044800200029 ENDCOMMON 3 0 M044800200030 DATA 3 60 M044800200031 EN DATA DATA-ERR M044800200032 MEV MB MB M044800200033 9.7 0.00 0.02 M044800200034 9.8 0.00 0.03 M044800200035 9.9 0.00 0.03 M044800200036 10. 0.01 0.03 M044800200037 10.1 0.02 0.03 M044800200038 10.2 0.00 0.02 M044800200039 10.3 0.00 0.02 M044800200040 10.4 0.02 0.03 M044800200041 10.5 0.01 0.03 M044800200042 10.6 0.00 0.03 M044800200043 10.7 0.01 0.04 M044800200044 10.8 0.03 0.04 M044800200045 10.9 -0.02 0.04 M044800200046 11. 0.01 0.04 M044800200047 11.1 0.04 0.04 M044800200048 11.2 0.02 0.05 M044800200049 11.3 0.03 0.05 M044800200050 11.4 0.07 0.05 M044800200051 11.5 0.06 0.05 M044800200052 11.6 0.05 0.05 M044800200053 11.7 0.15 0.06 M044800200054 11.8 0.175 0.060 M044800200055 11.9 0.15 0.06 M044800200056 12. 0.17 0.06 M044800200057 12.1 0.185 0.060 M044800200058 12.2 0.22 0.07 M044800200059 12.3 0.215 0.070 M044800200060 12.4 0.215 0.070 M044800200061 12.5 0.21 0.07 M044800200062 12.6 0.165 0.070 M044800200063 12.7 0.225 0.070 M044800200064 12.8 0.235 0.070 M044800200065 12.9 0.37 0.07 M044800200066 13. 0.23 0.07 M044800200067 13.1 0.40 0.08 M044800200068 13.2 0.485 0.080 M044800200069 13.3 0.42 0.08 M044800200070 13.4 0.57 0.08 M044800200071 13.5 0.425 0.090 M044800200072 13.6 0.43 0.09 M044800200073 13.7 0.35 0.09 M044800200074 13.8 0.475 0.090 M044800200075 13.9 0.275 0.090 M044800200076 14. 0.165 0.090 M044800200077 14.1 0.295 0.090 M044800200078 14.2 0.095 0.090 M044800200079 14.3 0.23 0.10 M044800200080 14.4 0.125 0.100 M044800200081 14.5 0.16 0.10 M044800200082 14.6 0.10 0.07 M044800200083 14.7 0.225 0.100 M044800200084 14.8 0.4 0.1 M044800200085 14.9 0.30 0.11 M044800200086 15. 0.405 0.110 M044800200087 15.1 0.375 0.120 M044800200088 15.2 0.555 0.120 M044800200089 15.3 0.53 0.12 M044800200090 15.4 0.62 0.12 M044800200091 15.5 0.55 0.12 M044800200092 15.6 0.415 0.120 M044800200093 ENDDATA 62 0 M044800200094 ENDSUBENT 93 0 M044800299999 SUBENT M0448003 20220211 M119M044800300001 BIB 8 20 M044800300002 REACTION (7-N-14(G,N)7-N-13,,SIG,,BRS) M044800300003 SAMPLE A total of 15 samples of dicyandiamide M044800300004 ((C-2)(H-4)(H-4)) were pressed into discs 30.4 nn in M044800300005 diameter and 13.7(0.1) mm thick. each disc weighed M044800300006 14.191(0.004) g. M044800300007 METHOD (ACTIV) M044800300008 DECAY-DATA (7-N-13,9.96MIN,AR,511.) M044800300009 DETECTOR (NAICR) M044800300010 ANALYSIS (PLA) Three independent activity yield curves M044800300011 were measured in 1 MeV intervals from 8 to 18 MeV, M044800300012 from which an average yield curve was constructed. M044800300013 cross section was unfolded from the average yield M044800300014 curve using the variable bin Penfold-Leiss (VBPL) M044800300015 method. M044800300016 STATUS (CURVE) Data from Fig. 3 of M044800300017 Nucl.Phys.A.465(1987)77. M044800300018 HISTORY (20181023A) Corrected by V.Varlamov: STATUS, M044800300019 ANALYSIS, PART-DET delayed, DECAY-DATA, DATA M044800300020 substituted (multiplyed by 10). M044800300021 (20220211U) Corrected by V.Varlamov: STATUS. M044800300022 ENDBIB 20 0 M044800300023 NOCOMMON 0 0 M044800300024 DATA 3 6 M044800300025 EN DATA DATA-ERR M044800300026 MEV MB MB M044800300027 10.5 .010 .025 M044800300028 11.5 .11 .03 M044800300029 12.5 .395 .045 M044800300030 13.5 .520 .045 M044800300031 14.5 .400 .045 M044800300032 15.5 .40 .05 M044800300033 ENDDATA 8 0 M044800300034 ENDSUBENT 33 0 M044800399999 SUBENT M0448004 20220211 M119M044800400001 BIB 6 14 M044800400002 REACTION ((7-N-14(G,N)7-N-13,PAR,INT,,BRS)+ M044800400003 (7-N-14(G,N+P)6-C-12,,INT,,BRS)) M044800400004 EN-SEC (E-LVL,7-N-13) M044800400005 METHOD Data obtained from direct neutron detection M044800400006 experiment. M044800400007 PART-DET (N) M044800400008 STATUS (DEP,M0448002) M044800400009 Reaction cross section. M044800400010 (TABLE) Data from table 1 of M044800400011 Nucl.Phys.A.465(1987)77. M044800400012 (COREL,M0448005) Activation data. M044800400013 HISTORY (20181023U) Corrected by V.Varlamov: STATUS. M044800400014 (20220211A) Corrected by V.Varlamov: REACTION, M044800400015 COMMENT -> METHOD, PART-DET, STATUS. M044800400016 ENDBIB 14 0 M044800400017 COMMON 1 3 M044800400018 E-LVL M044800400019 MEV M044800400020 0.0 M044800400021 ENDCOMMON 3 0 M044800400022 DATA 4 1 M044800400023 EN-MIN EN-MAX DATA DATA-ERR M044800400024 MEV MEV MB*MEV MB*MEV M044800400025 10.5 14.5 .72 .10 M044800400026 ENDDATA 3 0 M044800400027 ENDSUBENT 26 0 M044800499999 SUBENT M0448005 20220211 M119M044800500001 BIB 5 12 M044800500002 REACTION (7-N-14(G,N)7-N-13,,INT,,BRS) M044800500003 METHOD (ACTIV) M044800500004 ANALYSIS 14N ground state data from activity measuring M044800500005 experiment at energy not enough for first excited M044800500006 state contribution. M044800500007 STATUS (DEP,M0448003) M044800500008 Reaction cross section. M044800500009 (TABLE) Data from table 1. M044800500010 (COREL,M0448004) Neutron detection data. M044800500011 HISTORY (20181023U) Corrected by V.Varlamov: STATUS. M044800500012 (20220211U) Corrected by V.Varlamov: REACTION, METHOD, M044800500013 COMMENT -> ANALYSIS, STATUS. M044800500014 ENDBIB 12 0 M044800500015 NOCOMMON 0 0 M044800500016 DATA 4 1 M044800500017 EN-MIN EN-MAX DATA DATA-ERR M044800500018 MEV MEV MB*MEV MB*MEV M044800500019 10.5 14.5 .95 .14 M044800500020 ENDDATA 3 0 M044800500021 ENDSUBENT 20 0 M044800599999 ENDENTRY 5 0 M044899999999