ENTRY 41529 20200720 41884152900000001 SUBENT 41529001 20200720 41884152900100001 BIB 21 157 4152900100002 TITLE A study of nuclear transmutation of Th and U-nat with 4152900100003 neutrons produced in a Pb-target and U-blanket 4152900100004 irradiated by 1.6 GeV deuterons 4152900100005 AUTHOR (J.Adam, K.Katovsky,M.Majerle,M.I.Krivopustov,V.Kumar, 4152900100006 Chitra Bhatia,Manish Sharma,A.A.Solnyshkin, 4152900100007 V.M.Tsoupko-Sitnikov) 4152900100008 INSTITUTE (4ZZZDUB) J.Adam,K.Katovsky,M.I.Krivopustov, 4152900100009 A.A.Solnyshkin,V.M.Tsoupko-Sitnikov. 4152900100010 (3CZRUJF) J.Adam, M.Majerle. 4152900100011 (3CZRCTI) K.Katovsky. 4152900100012 (3INDURJ) V.Kumar,Chitra Bhatia,Manish Sharma. 4152900100013 REFERENCE (J,EPJ/A,43,159,2010) 4152900100014 #doi:10.1140/epja/i2010-10909-y 4152900100015 (W,KUMAR,20091023) 4152900100016 This article was received from Pr.V.Kumar. 4152900100017 REL-REF (N,,M.I.Krivopustov+,J,KT,68,48,2003) 4152900100018 (N,,V.S.Barashenkov+,J,NIM/B,217,352,2004) 4152900100019 Details of exp. setup. 4152900100020 (R,C0950003,G.L.Morgan+,J,NIM/B,211,297,2003) 4152900100021 (N,,J.Frana,J,JRN,257,583,2003) Code DEIMOS . 4152900100022 FACILITY (SYNCH,4ZZZDUB) Nuclotron Accelerator in Lab.of High 4152900100023 Energies of Joint Institute for Nuclear Research,Dubna.4152900100024 Target-blanket facility 'Energy plus Transmutation' is4152900100025 the system of lead target (length 456 mm, diameter 4152900100026 84 mm, total mass 28.7 kg) and natural U blanket of 4152900100027 four sections (each contains 30 U rods enclosed in Al 4152900100028 shell) 4152900100029 INC-SOURCE (SPALL) Neutrons generated by the spallation reaction. 4152900100030 1.6 GeV deuteron beam. Subcritical uranium blanket. 4152900100031 Al Na-24 rate Deuteron beam Flux 4152900100032 foil production,1/s intensity,1/s Nd /cm**2/s 4152900100033 1 196+-6 8.18E+7 2.36E+7 4152900100034 2 1735+-42 7.24E+8 1.55E+7 4152900100035 3 496+-13 2.07E+8 0.33E+7 4152900100036 4 28+-2 1.17E+7 1.33E+5 4152900100037 Total beam intensity (10.24+-.774)E+8 1/s. 4152900100038 Total integral number of deuterons (24.5+-.617)E+12 4152900100039 Integral deuteron beam intensity hitting Pb target 4152900100040 (1.93+-0.25)E+13 . 4152900100041 37 Pb-nat foils (0.7x0.7x0.03 cm) covered by 4152900100042 fission-track detectors were irradiated with deuteron 4152900100043 beam in from of lead target to determine shape of 4152900100044 beam. 4152900100045 Neutrons produced in lead target were multiplied and 4152900100046 moderated in U-blanket. 4152900100047 INC-SPECT Simulated (using the INCL model and real beam) neutron4152900100048 flux is on Fig.4 of J,EPJ ,in which the total flux of 4152900100049 neutrons is 2.86E-2 neutrons/cm2/deuteron. 4152900100050 Looks like as of exponential shape, value varies 4152900100051 from about 3.E-2 neutron/deuteron/MeV/cm**2 at about 4152900100052 20 MeV energy to about 8.E-8 neutron/deuteron/MeV/cm2 4152900100053 at about 980 MeV neutron energy. 4152900100054 Digitized from Fig.4 spectrum: 4152900100055 En, MeV Flux,neutron/deuteron/MeV/cm**2 4152900100056 20.7 0.315E-01 4152900100057 49.0 0.362E-03 4152900100058 72.1 0.195E-03 4152900100059 97.9 0.129E-03 4152900100060 123.6 0.855E-04 4152900100061 146.8 0.113E-03 4152900100062 172.6 0.606E-04 4152900100063 221.5 0.350E-04 4152900100064 273.0 0.216E-04 4152900100065 324.5 0.134E-04 4152900100066 373.4 0.826E-05 4152900100067 424.9 0.628E-05 4152900100068 473.8 0.416E-05 4152900100069 522.7 0.295E-05 4152900100070 574.2 0.224E-05 4152900100071 620.5 0.121E-05 4152900100072 669.4 0.113E-05 4152900100073 723.5 0.916E-06 4152900100074 769.8 0.916E-06 4152900100075 823.9 0.461E-06 4152900100076 875.4 0.248E-06 4152900100077 924.3 0.102E-06 4152900100078 975.8 0.827E-07 4152900100079 The proton flux is 1000 times lower and the fluxes of 4152900100080 pions, deuteron and photon are 2E+4 , 5 E+5 and 4152900100081 5 times lower than the neutron flux, respectively. 4152900100082 SAMPLE Natural uranium and thorium-232 samples (in form of 4152900100083 sandwiches of three identical foils Th-Th-Th and U-U-U)4152900100084 and other radioactive samples (I-129,Pu-238,Pu-239, 4152900100085 Np-237) on the top of second section of the blanket. 4152900100086 Foils diameter 15 mm, middle U and Th foils weights 4152900100087 172 mg and 93.2 mg, respectively. 4152900100088 Al foils of 21, 80,120,160 mm diameter, 4152900100089 24,318,428,598 mg weight. 4152900100090 EXP-YEAR (2006) 4152900100091 METHOD (ACTIV) Irradiation time 400 minutes. 4152900100092 Counting started after 2.4 hours after irradiation, 4152900100093 measurement times from 0.5 to 24 hours. All 4152900100094 measurements were performed within 29 days. 4152900100095 (GSPEC) Standard gamma-spectrometry method to obtain 4152900100096 the total number deuterons hitting the lead target, 4152900100097 by thin Al monitors ( stack of three Al foils of 4152900100098 6.6975 mg/cm**2 thickness each). 4152900100099 Reaction products were identified by gamma-spectrometry4152900100100 using HPGE detectors. 4152900100101 MONITOR (13-AL-27(D,2N+3P)11-NA-24,,SIG) The values of Na-24 4152900100102 production cross sections for 2.33 GeV from MONIT-REF 4152900100103 of J.Banaigs+, for 6 GeV and 7.30 GeV deuteron energies4152900100104 from MONIT-REF of P.Kozma+ and they are 15.25+-1.5 mb, 4152900100105 14.1+-1.3 mb and 14.7 +- 1.2 mb, respectively. 4152900100106 MONIT-REF (B0013003,J.Banaigs+,J,NIM,95,307,1971) 4152900100107 (,P.Kozma+,J,CZJ,40,393,1990) 4152900100108 DETECTOR (THRES) Set of threshold detectors. 4152900100109 (HPGE) For gamma-spectrometry of activated samples. 4152900100110 Coaxial detector with relative efficiency 18.9 %, 4152900100111 resolution 1.78 keV at 1332 keV. 4152900100112 Planar detector of 36 mm diameter, 13 mm thickness, 4152900100113 resolution 335 eV at 5.9 keV and 580 keV at 122 keV. 4152900100114 Coaxial detector is used to provide information of 4152900100115 peaks from 20 keV to 3 MeV; planar detector is used 4152900100116 for about from 5 keV to 700 keV. 4152900100117 ASSUMED (ASSUM1,(13-AL-27(D,2N+3P)11-NA-24,,SIG)/ 4152900100118 (13-AL-27(P,N+3P)11-NA-24,,SIG)) 4152900100119 Ratio = 1.495 for deuteron energy 1.165 GeV/A, 4152900100120 proton energy 1.165 GeV. 4152900100121 (ASSUM2,13-AL-27(P,N+3P)11-NA-24,,SIG) 4152900100122 10.07+-0.20 mb at 0.81 GeV protons from REL-REF of 4152900100123 G.L.Morgan+ . 4152900100124 COMMENT Of compiler.In C0950003 at 0.81 GeV c-s value is 4152900100125 10.70+-1.2%. Question about the value really used was 4152900100126 sent to J.Adam 11.12.2009. 4152900100127 CORRECTION Na-24 rate production was corrected for: 4152900100128 - beam intensity fluctuations - 0.9865 , 4152900100129 - coincidence summing for 1368 keV gamma - 1.017, 4152900100130 for 2754 keV gamma - 1.053 . 4152900100131 Residual nuclei production rates were corrected for: 4152900100132 - self-absorption of gamma-ray in sample. 4152900100133 - the fluctuation of beam intensity. 4152900100134 - coincidence summing. 4152900100135 - non-point geometry of measured sample. 4152900100136 ANALYSIS Processing of measured data was performed by 4152900100137 interactive mode of DEIMOS code. Energy calibration, 4152900100138 background gamma-lines subtraction, single and double 4152900100139 escape peaks subtracting, efficiency calibration, 4152900100140 experimental half-lives determination were made by 4152900100141 system of codes. 4152900100142 ADD-RES (RRATE) Absolute rates of independent and cumulative 4152900100143 reactions in different U-nat and Th-232 samples were 4152900100144 determined as the ratio of number of produced residual4152900100145 nuclei per sec, per number of atoms of the sample and 4152900100146 per number of incident deuterons. 4152900100147 Measured reaction rates: 4152900100148 Th-232(n,gamma) - (3.03+-0.10)E-26, 4152900100149 Th-232(n,f) - (5.89+-0.60)E-27, 4152900100150 Th-232(n,2n) - (1.60+-0.16)E-27, 4152900100151 U-nat(n,g) - (2.97+-0.14)E-26, 4152900100152 U-nat(n,f) - (2.24+-0.10)E-26. 4152900100153 (COMP) Comparison with reaction rates calculated by 4152900100154 several theoretical models using ENDF/B-VI and 4152900100155 JEFF-3.1 evaluated libraries. 4152900100156 STATUS 11.12.2009 the copy of ENTRY was sent to J.Adam. 4152900100157 HISTORY (20091208C) M.M. 4152900100158 (20200720U) ACCEL -> SYNCH 4152900100159 ENDBIB 157 0 4152900100160 COMMON 4 3 4152900100161 EN-MAX ASSUM1 ASSUM2 ASSUM2-ERR 4152900100162 GEV NO-DIM MB MB 4152900100163 1.6 1.495 10.07 0.20 4152900100164 ENDCOMMON 3 0 4152900100165 ENDSUBENT 164 0 4152900199999 SUBENT 41529002 20091208 41484152900200001 BIB 5 28 4152900200002 REACTION ((90-TH-232(N,2N)90-TH-231,,SIG,,SPA)/ 4152900200003 (90-TH-232(N,F)90-TH-231,,SIG,,SPA)) 4152900200004 ANALYSIS Ratio of reaction rates was defined by measured 4152900200005 fission reaction rate (= (5.89+-0.70)E-27) and 4152900200006 measured n,2n reaction rate (= (1.60+-0.16)E-27) . 4152900200007 DECAY-DATA (90-TH-231,25.520HR,DG,25.646,0.1450, 4152900200008 DG,81.227,0.0089, 4152900200009 DG,84.216,0.0660, 4152900200010 DG,89.944,0.0094) 4152900200011 25.520+-0.010 hr. 4152900200012 (91-PA-233,26.967D,DG,75.354,0.0139, 4152900200013 DG,86.814,0.0197, 4152900200014 DG,103.941,0.0087, 4152900200015 DG,300.110,0.0662, 4152900200016 DG,311.890,0.386, 4152900200017 DG,340.710,0.0447, 4152900200018 DG,375.450,0.00679, 4152900200019 DG,398.620,0.01390, 4152900200020 DG,415.760,0.01745) 4152900200021 26.967+-0.002 day. 4152900200022 (42-MO-99,2.7475D,DG,140.681,0.8943) 4152900200023 2.7475+-0.0004 day. 4152900200024 Half-lives from evaluated library. 4152900200025 ERR-ANALYS (ERR-T) Total error 4152900200026 (ERR-S) Statistical error. 4152900200027 (ERR-1) Error due to non-availability of data of 4152900200028 fission yield at high energy, En >14 MeV. 4152900200029 STATUS (TABLE) Text of J,EPJ , 22th page. 4152900200030 ENDBIB 28 0 4152900200031 NOCOMMON 0 0 4152900200032 DATA 4 1 4152900200033 DATA ERR-T ERR-S ERR-1 4152900200034 NO-DIM NO-DIM NO-DIM NO-DIM 4152900200035 0.27 0.09 0.04 0.08 4152900200036 ENDDATA 3 0 4152900200037 ENDSUBENT 36 0 4152900299999 ENDENTRY 2 0 4152999999999