ENTRY L0037 20110119 M056L003700000001 SUBENT L0037001 20110119 M056L003700100001 BIB 13 39 L003700100002 TITLE Photonuclear activation by 20.5-MeV gamma rays. L003700100003 AUTHOR (W.E.DEL BIANCO,W.E.STEPHENS) L003700100004 INSTITUTE (1USAPEN) L003700100005 REFERENCE (J,PR,126,709,196204) L003700100006 #doi:10.1103/PhysRev.126.709 L003700100007 FACILITY (VDG,1USAPEN) Electrostatic accelerator - L003700100008 Van de Graaff. L003700100009 INC-SOURCE (MPH=(1-H-3(P,G)2-HE-4)) Gamma-ray energy resolution L003700100010 about 250 keV at energy of 20.48 MeV. L003700100011 DETECTOR (NAICR) Positron activity was determined by a L003700100012 coincidence detector, consisting of two 5 by 2 inch L003700100013 NaI crystals set on the annihilation radiation L003700100014 photopeaks. This detector was calibrated against a L003700100015 18F positron source standardized in a 2pi flow L003700100016 counter. L003700100017 Gamma-rays were monitored by a 3 by 4 inch NaI crystal L003700100018 and calibrated with a 4.5 * 6 inch crystal whose L003700100019 response curve to the gamma rays was determined. The L003700100020 absorption coefficient of these photons in 'NaI' was L003700100021 determined by a good geometry transmission experiment L003700100022 METHOD (ACTIV) L003700100023 PART-DET (AR) Positron annihilation radiation. L003700100024 ANALYSIS Direct measurement of positron activity. L003700100025 ERR-ANALYS (DATA-ERR) Represents standard error due to counting L003700100026 statistics and other gaussian errors, but does not L003700100027 include the error involved in the determination of L003700100028 the absolute efficiency of the positron and photon L003700100029 detectors. L003700100030 The uncertainty in the calibration of the gamma-ray L003700100031 monitor was estimated to be less then 3.5%; the error L003700100032 attributed to efficiency of the positron detector L003700100033 varied from 1 to 3%. L003700100034 COMMENT Structure in the 12C(gamma,n)11C and 19F(gamma,n)18F L003700100035 reactions, although reported by other experiments, L003700100036 was not observed. L003700100037 HISTORY (19891206C) L003700100038 (20110119A) Corrected by V.Varlamov: dates, REFERENCE, L003700100039 INSTITUTE, FACILITY, INC-SOURCE in SUBENT 001, one L003700100040 DATA point corrected in SUBENT 002, STATUS in others. L003700100041 ENDBIB 39 0 L003700100042 NOCOMMON 0 0 L003700100043 ENDSUBENT 42 0 L003700199999 SUBENT L0037002 20110119 M056L003700200001 BIB 3 3 L003700200002 REACTION (6-C-12(G,N)6-C-11,,SIG) L003700200003 SAMPLE Reactor grade graphite with a purity of 99.93%. L003700200004 STATUS (BERMN) Data converted from file of B.Berman. L003700200005 ENDBIB 3 0 L003700200006 NOCOMMON 0 0 L003700200007 DATA 3 26 L003700200008 EN DATA DATA-ERR L003700200009 MEV MB MB L003700200010 20.17 0.76 L003700200011 20.21 0.75 L003700200012 20.26 0.81 L003700200013 20.30 0.96 L003700200014 20.34 0.96 L003700200015 20.39 1.08 L003700200016 20.43 1.04 L003700200017 20.47 0.93 L003700200018 20.51 1.09 L003700200019 20.54 1.15 L003700200020 20.59 1.33 L003700200021 20.62 1.23 L003700200022 20.66 1.48 0.15 L003700200023 20.70 1.54 L003700200024 20.73 1.60 L003700200025 20.77 1.88 L003700200026 20.82 1.87 L003700200027 20.88 2.34 L003700200028 20.93 1.89 L003700200029 20.94 2.30 L003700200030 20.95 2.62 L003700200031 20.96 2.13 L003700200032 21.05 3.18 L003700200033 21.06 2.41 L003700200034 21.09 2.64 L003700200035 21.18 2.95 L003700200036 ENDDATA 28 0 L003700200037 ENDSUBENT 36 0 L003700299999 SUBENT L0037003 20110119 M056L003700300001 BIB 3 3 L003700300002 REACTION (9-F-19(G,N)9-F-18,,SIG) L003700300003 SAMPLE 'Virgin' teflon (polytetrafluoroethylene). L003700300004 STATUS (CURVE) Digitizing of the USA NIST. L003700300005 ENDBIB 3 0 L003700300006 NOCOMMON 0 0 L003700300007 DATA 3 18 L003700300008 EN DATA DATA-ERR L003700300009 MEV MB MB L003700300010 20.29 2.67 L003700300011 20.34 4.49 L003700300012 20.37 3.6 L003700300013 20.42 3.42 L003700300014 20.46 3.37 L003700300015 20.54 3.13 L003700300016 20.58 2.76 L003700300017 20.62 3.22 L003700300018 20.66 3.68 L003700300019 20.7 3.69 .3 L003700300020 20.73 3.32 L003700300021 20.77 2.49 L003700300022 20.81 3.53 L003700300023 20.88 2.52 L003700300024 20.92 2.92 L003700300025 20.95 2.54 L003700300026 21.05 4.44 L003700300027 21.1 2.97 L003700300028 ENDDATA 20 0 L003700300029 ENDSUBENT 28 0 L003700399999 SUBENT L0037004 20110119 M056L003700400001 BIB 3 4 L003700400002 REACTION (8-O-16(G,N)8-O-15,,SIG) L003700400003 SAMPLE Samples obtained by pressing boric acid powder in a dieL003700400004 and machining the resultant disk to the desired shape L003700400005 STATUS (TABLE) Data taken from table in article L003700400006 ENDBIB 4 0 L003700400007 NOCOMMON 0 0 L003700400008 DATA 3 1 L003700400009 EN DATA DATA-ERR L003700400010 MEV MB MB L003700400011 20.48 .6 .12 L003700400012 ENDDATA 3 0 L003700400013 ENDSUBENT 12 0 L003700499999 SUBENT L0037005 20110119 M056L003700500001 BIB 3 3 L003700500002 REACTION (24-CR-50(G,N)24-CR-49,,SIG) L003700500003 SAMPLE Pure metal (purity 99.9%). L003700500004 STATUS (TABLE) Data taken from table in article L003700500005 ENDBIB 3 0 L003700500006 NOCOMMON 0 0 L003700500007 DATA 3 1 L003700500008 EN DATA DATA-ERR L003700500009 MEV MB MB L003700500010 20.48 29.1 6. L003700500011 ENDDATA 3 0 L003700500012 ENDSUBENT 11 0 L003700599999 SUBENT L0037006 20110119 M056L003700600001 BIB 3 3 L003700600002 REACTION (26-FE-54(G,N)26-FE-53,,SIG) L003700600003 SAMPLE Pure metal (purity 99.9%). L003700600004 STATUS (TABLE) Data taken from table in article L003700600005 ENDBIB 3 0 L003700600006 NOCOMMON 0 0 L003700600007 DATA 3 1 L003700600008 EN DATA DATA-ERR L003700600009 MEV MB MB L003700600010 20.48 30. 4.8 L003700600011 ENDDATA 3 0 L003700600012 ENDSUBENT 11 0 L003700699999 SUBENT L0037007 20110119 M056L003700700001 BIB 3 3 L003700700002 REACTION (29-CU-63(G,N)29-CU-62,,SIG) L003700700003 SAMPLE Pure metal (purity 99.9%). L003700700004 STATUS (TABLE) Data taken from table in article L003700700005 ENDBIB 3 0 L003700700006 NOCOMMON 0 0 L003700700007 DATA 3 1 L003700700008 EN DATA DATA-ERR L003700700009 MEV MB MB L003700700010 20.48 52.5 2.1 L003700700011 ENDDATA 3 0 L003700700012 ENDSUBENT 11 0 L003700799999 SUBENT L0037008 20110119 M056L003700800001 BIB 3 3 L003700800002 REACTION (30-ZN-64(G,N)30-ZN-63,,SIG) L003700800003 SAMPLE Pure metal (purity 99.9%). L003700800004 STATUS (TABLE) Data taken from table in article L003700800005 ENDBIB 3 0 L003700800006 NOCOMMON 0 0 L003700800007 DATA 3 1 L003700800008 EN DATA DATA-ERR L003700800009 MEV MB MB L003700800010 20.48 35.7 1.7 L003700800011 ENDDATA 3 0 L003700800012 ENDSUBENT 11 0 L003700899999 SUBENT L0037009 20110119 M056L003700900001 BIB 3 3 L003700900002 REACTION (59-PR-141(G,N)59-PR-140,,SIG) L003700900003 SAMPLE Pure metal (purity 99.9%). L003700900004 STATUS (TABLE) Data taken from table in article L003700900005 ENDBIB 3 0 L003700900006 NOCOMMON 0 0 L003700900007 DATA 3 1 L003700900008 EN DATA DATA-ERR L003700900009 MEV MB MB L003700900010 20.48 51.7 5.4 L003700900011 ENDDATA 3 0 L003700900012 ENDSUBENT 11 0 L003700999999 SUBENT L0037010 20110119 M056L003701000001 BIB 3 3 L003701000002 REACTION (42-MO-92(G,N)42-MO-91,PAR,SIG) L003701000003 SAMPLE Pure metal (purity 99.9%). L003701000004 STATUS (TABLE) Data taken from table in article L003701000005 ENDBIB 3 0 L003701000006 COMMON 1 3 L003701000007 E-LVL L003701000008 MEV L003701000009 0.0 L003701000010 ENDCOMMON 3 0 L003701000011 DATA 3 1 L003701000012 EN DATA DATA-ERR L003701000013 MEV MB MB L003701000014 20.48 35.4 2.3 L003701000015 ENDDATA 3 0 L003701000016 ENDSUBENT 15 0 L003701099999 SUBENT L0037011 20110119 M056L003701100001 BIB 3 3 L003701100002 REACTION (51-SB-121(G,N)51-SB-120,PAR,SIG) L003701100003 SAMPLE Pure metal (purity 99.9%). L003701100004 STATUS (TABLE) Data taken from table in article L003701100005 ENDBIB 3 0 L003701100006 COMMON 1 3 L003701100007 E-LVL L003701100008 MEV L003701100009 0.0 L003701100010 ENDCOMMON 3 0 L003701100011 DATA 3 1 L003701100012 EN DATA DATA-ERR L003701100013 MEV MB MB L003701100014 20.48 33.4 2.5 L003701100015 ENDDATA 3 0 L003701100016 ENDSUBENT 15 0 L003701199999 ENDENTRY 11 0 L003799999999