ENTRY M0346 20240329 M130M034600000001 SUBENT M0346001 20240329 M130M034600100001 BIB 17 52 M034600100002 TITLE Photoneutron disintegration of Ar-40. M034600100003 AUTHOR (J.W.Jury,J.I.Lodge,K.H.Lokan,N.K.Sherman,R.W.Gellie) M034600100004 INSTITUTE (1CANOTC) M034600100005 REFERENCE (J,CJP,51,1176,1973) M034600100006 FACILITY (LINAC,1CANOTC) M034600100007 INC-SOURCE (BRST) M034600100008 SAMPLE Enriched to 99.6 %. Ar-40 contained in the 12 cm M034600100009 diameter vacuum-insulated target-vessel. M034600100010 METHOD (TOF) M034600100011 The energy resolution of time-of-flight system was M034600100012 0.6 - 0.9 ns/m (20 keV at neutron energy of 1 MeV). M034600100013 DETECTOR (SCIN) Proton-recoil detector was consisted of 8 cm M034600100014 thick cylinder of Ne 102 scintillator viewed by 4 M034600100015 photomultiplier tubes. M034600100016 MONITOR (1-H-2(G,N)1-H-1,,SIG) M034600100017 MONIT-REF (,A.Whetstone+,J,PR,109,2072,1958) M034600100018 ANALYSIS A series of photoneutron difference spectra were M034600100019 obtained by subtracting the neutron spectrum measured M034600100020 at each end-point energy from the spectrum obtained M034600100021 at the next higher energy. Such subtractions were M034600100022 carried out for 1 MeV differences up to 16 MeV and in M034600100023 2 MeV steps thereafter. M034600100024 CORRECTION Data were corrected for (a) the background and (b) the M034600100025 detector efficiency. M034600100026 ADD-RES (COMP) The theoretical description of the gamma M034600100027 quantum absorption by the whole nucleus at the M034600100028 resonance energy was performed. M034600100029 REL-REF (N,,R.W.Grllie+,J,CJP,50,1689,1972) Description of the M034600100030 experimental facility. M034600100031 (A,,D.McPherson+,J,CJP,32,593,1954) The first results M034600100032 on the total photoneutron cross section of Ar-40 were M034600100033 received for giant dipole resonance at 20 MeV. M034600100034 (N,,G.G.Bunatyan+,J,SNP,13,695,1971) The theoretical M034600100035 description of the gamma-quantum absorption. M034600100036 COMMENT Photoneutron energy spectra from Ar-40 have been M034600100037 measured at bremsstrahlung end-point energies from 13 M034600100038 to 23 MeV in 1 MeV steps. The total cross section M034600100039 derived from the neutron spectra exhibits a change M034600100040 from single particle behavior at about 14 MeV where M034600100041 collective effects begin to dominate and neutrons are M034600100042 emitted to highly excited states of Ar-39. M034600100043 HISTORY (19880323C) Data were compiled in SCJAD of Saratov M034600100044 State University. M034600100045 (20081110A) Corrected by V.Varlamov: dates corrected, M034600100046 ERR-ANALYS in SUBENT 001, ANALYSIS and ERR-ANALYS M034600100047 in SUBENT 003 and DATA-ERR in SUBENT 009, SUBENTS M034600100048 004 - 008 deleted because quantity at two incident M034600100049 energies cannot be compiled, lowercase. M034600100050 (20240329U) Corrected by V.Varlamov: lowercase, M034600100051 METHOD, PART-DET, EN-SEC, REACTION, SUBENT 002 M034600100052 deleted because no data for EXFOR, SUBENT 003 deleted M034600100053 because of repetition of SUBENT 009, STATUS. M034600100054 ENDBIB 52 0 M034600100055 COMMON 1 3 M034600100056 E-RSL M034600100057 MEV M034600100058 0.02 M034600100059 ENDCOMMON 3 0 M034600100060 ENDSUBENT 59 0 M034600199999 NOSUBENT M0346002 20240329 M130M034600200001 NOSUBENT M0346003 20240329 M130M034600300001 NOSUBENT M0346004 20090323 M047M034600400001 NOSUBENT M0346005 20090323 M047M034600500001 NOSUBENT M0346006 20090323 M047M034600600001 NOSUBENT M0346007 20090323 M047M034600700001 NOSUBENT M0346008 20090323 M047M034600800001 SUBENT M0346009 20240329 M130M034600900001 BIB 6 14 M034600900002 REACTION (18-AR-40(G,N)18-AR-39,PAR,DA,,BRS) M034600900003 ANALYSIS The ground state differential cross section has been M034600900004 received from the neutron difference spectra dividing M034600900005 by the bremsstrahlung intensity distributions. The M034600900006 fine structure in the low energy region has been M034600900007 averaged over 200 keV intervals. M034600900008 data are a collage of results obtained by using 11 M034600900009 different end-points energies. M034600900010 ERR-ANALYS (ERR-S) Statistical errors of measurements. M034600900011 MISC-COL (MISC) The relative number of non-ground state M034600900012 transitions from excited states of Ar-40. M034600900013 STATUS (CURVE,,J.W.Jury+,J,CJP,51,1176,1973) M034600900014 Data from Fig. 5. M034600900015 HISTORY (20240329U) Corrected by V.Varlamov: EN-SEC, STATUS. M034600900016 ENDBIB 14 0 M034600900017 COMMON 3 3 M034600900018 E-LVL ERR-S ANG M034600900019 MEV MB/SR ADEG M034600900020 0. 0.03 90. M034600900021 ENDCOMMON 3 0 M034600900022 DATA 3 105 M034600900023 EN DATA MISC M034600900024 MEV MB/SR PER-CENT M034600900025 11.16 0.92 M034600900026 11.26 0.78 M034600900027 11.35 0.87 M034600900028 11.48 0.85 M034600900029 11.53 0.68 M034600900030 11.66 0.52 M034600900031 11.84 0.54 M034600900032 11.93 0.32 M034600900033 12.02 0.44 M034600900034 12.11 0.32 M034600900035 12.25 0.22 M034600900036 12.29 0.17 M034600900037 12.38 0.12 M034600900038 12.56 0.11 M034600900039 12.63 0.18 M034600900040 12.79 0.12 M034600900041 12.97 0.13 M034600900042 13.06 0.14 M034600900043 13.24 0.16 M034600900044 13.37 0.12 M034600900045 13.51 0.16 0.69 M034600900046 13.60 0.18 M034600900047 13.69 0.22 M034600900048 13.78 0.25 M034600900049 13.87 0.24 M034600900050 14.00 0.25 M034600900051 14.14 0.27 M034600900052 14.23 0.30 M034600900053 14.32 0.32 M034600900054 14.41 0.28 54.86 M034600900055 14.50 0.19 M034600900056 14.59 0.23 M034600900057 14.68 0.25 M034600900058 14.77 0.29 M034600900059 14.86 0.29 M034600900060 14.95 0.32 M034600900061 15.08 0.33 M034600900062 15.13 0.34 M034600900063 15.22 0.36 M034600900064 15.31 0.38 M034600900065 15.40 0.53 M034600900066 15.44 0.46 67.36 M034600900067 15.50 0.28 M034600900068 15.67 0.26 M034600900069 15.76 0.29 M034600900070 15.85 0.36 M034600900071 15.94 0.32 M034600900072 16.03 0.28 M034600900073 16.12 0.32 M034600900074 16.21 0.31 M034600900075 16.30 0.29 M034600900076 16.39 0.28 M034600900077 16.48 0.20 M034600900078 16.57 0.23 M034600900079 16.66 0.18 M034600900080 16.75 0.22 M034600900081 16.84 0.24 M034600900082 17.02 0.28 71.53 M034600900083 17.15 0.34 M034600900084 17.29 0.35 M034600900085 17.38 0.33 M034600900086 17.47 0.33 M034600900087 17.60 0.29 M034600900088 17.74 0.37 M034600900089 17.83 0.36 M034600900090 17.92 0.31 M034600900091 18.01 0.25 M034600900092 18.10 0.32 M034600900093 18.19 0.30 M034600900094 18.28 0.21 M034600900095 18.37 0.15 M034600900096 18.46 0.23 M034600900097 18.60 0.20 M034600900098 18.68 0.23 M034600900099 18.82 0.26 M034600900100 18.95 0.22 M034600900101 19.00 0.23 88.89 M034600900102 19.05 0.36 M034600900103 19.09 0.24 M034600900104 19.18 0.32 M034600900105 19.27 0.22 M034600900106 19.36 0.32 M034600900107 19.49 0.25 M034600900108 19.67 0.23 M034600900109 19.90 0.24 M034600900110 20.08 0.27 M034600900111 20.17 0.26 M034600900112 20.26 0.24 M034600900113 20.44 0.21 M034600900114 20.53 0.20 M034600900115 20.66 0.13 M034600900116 20.84 0.17 M034600900117 21.16 0.13 95.14 M034600900118 21.47 0.12 M034600900119 21.74 0.12 M034600900120 21.88 0.12 M034600900121 21.97 0.10 M034600900122 22.06 0.13 M034600900123 22.15 0.14 M034600900124 22.24 0.11 M034600900125 22.33 0.12 M034600900126 22.51 0.14 M034600900127 22.60 0.09 M034600900128 22.73 0.06 M034600900129 22.87 0.07 M034600900130 ENDDATA 107 0 M034600900131 ENDSUBENT 130 0 M034600999999 SUBENT M0346010 20240329 M130M034601000001 BIB 7 15 M034601000002 REACTION (18-AR-40(G,X)0-NN-1,,SIG) M034601000003 ASSUMED Isotropy of the neutron angular distributions is M034601000004 assumed as an approximation. M034601000005 ANALYSIS The total cross section has been obtained as a product M034601000006 of the ground-state differential cross section by the M034601000007 sum of the unit and the relative number of non-ground M034601000008 state transitions from excited states of Ar-40. M034601000009 ERR-ANALYS No information. M034601000010 ADD-RES The integrated strength of the measured total M034601000011 photoneutron cross section was found to be 260 mb*MeV M034601000012 with 60 mb*MeV error. M034601000013 STATUS (DEP,M0346009) M034601000014 (CURVE,,J.W.Jury+,J,CJP,51,1176,1973) M034601000015 Data from Fig. 9. M034601000016 HISTORY (20240329U) Corrected by V.Varlamov: STATUS, M034601000017 ENDBIB 15 0 M034601000018 NOCOMMON 0 0 M034601000019 DATA 2 9 M034601000020 EN DATA M034601000021 MEV MB M034601000022 11.03 10.78 M034601000023 12.00 5.88 M034601000024 13.03 2.35 M034601000025 14.45 8.63 M034601000026 15.03 10.98 M034601000027 16.00 16.47 M034601000028 16.90 22.16 M034601000029 18.97 33.14 M034601000030 20.97 31.96 M034601000031 ENDDATA 11 0 M034601000032 ENDSUBENT 31 0 M034601099999 ENDENTRY 10 0 M034699999999