ENTRY 22698 20201216 22972269800000001 SUBENT 22698001 20201216 22972269800100001 BIB 13 37 2269800100002 TITLE 233Pa(n,f) cross section up to En=8.5 MeV 2269800100003 AUTHOR (F.Tovesson, E.Birgersson, M.Fleneus, B.Fogelberg, 2269800100004 V.Fritsch, C.Gustafsson, F.-J.Hambsch, A.Oberstedt, 2269800100005 S.Oberstedt, E.Ramstroem, A.Tudora, G.Vladuca) 2269800100006 INSTITUTE (2SWDSWD) Orebro University, Orebro 2269800100007 (2SWDUPP,2ZZZGEL,3RUMBUC) 2269800100008 REFERENCE (J,NP/A,733,3,2004) 2269800100009 (J,PRL,88,062502,2002) 2269800100010 233Pu and 233U data (1st campaign) in fig 2269800100011 ((S,ISINN-10,202,2003)=(S,JINR-E3-2003-10,202,2003)) 2269800100012 233Pu and 233U data (1st+2nd campaign) in fig 2269800100013 (J,NSTS,2,210,2002) 2269800100014 233Pu and 233U data (1st campaign) in fig 2269800100015 (T,TOVESSON,2003) 2269800100016 Doctor thesis submitted to Orebro Univ. Data in table.2269800100017 REL-REF (I,,C.Budtz-Joergensen+,J,NIM/A,258,209,1987) 2269800100018 Details of fission chamber construction 2269800100019 FACILITY (VDG,2ZZZGEL) 7-MV Van de Graaff 2269800100020 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) for En=1.0-3.8 MeV 2269800100021 (D-D) TiD or D2 gas (~200 kPa) for En=5.0-8.5 MeV 2269800100022 INC-SPECT Energy width calculated by ENERGYSET was 2269800100023 - 1.5-10% (FWHM) for TiT neutrons, 2269800100024 - 1.0-3.5% for TiD neutrons, 2269800100025 - 2.0-4.5% for D2 gas neutrons. 2269800100026 MONITOR (93-NP-237(N,F),,SIG) 2269800100027 MONIT-REF (,P.F.Rose,R,BNL-NCS-17541,1991) ENDF/B-VI 2269800100028 DETECTOR (FISCH) Frish-gridded fission chamber with counting 2269800100029 gas P-10 (90%Ar+10%CH4) where the 233Pa/233U and 2269800100030 237Np samples were placed in a back-to-back geometry. 2269800100031 STATUS (APRVD) Approved by Andreas Oberstedt (2020-12-21) 2269800100032 HISTORY (20030407C) J.O.S. 2269800100033 (20031230A) Corrections made. 003 and 004 merged. 2269800100034 (20040802A) Two Subents added 2269800100035 (20080108A) Errors specified - Sm 2269800100036 (20080108U) Last corrections have been done. 2269800100037 (20110106A) On. Reference corrected. Subent 003 deleted2269800100038 (20201216A) On. Major rev. Or restoration in 002-006. 2269800100039 ENDBIB 37 0 2269800100040 NOCOMMON 0 0 2269800100041 ENDSUBENT 40 0 2269800199999 SUBENT 22698002 20201216 22972269800200001 BIB 7 13 2269800200002 REACTION 1(92-U-233(N,F),,SIG) 2269800200003 2(92-U-233(N,F),,SIG) 2269800200004 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) 2269800200005 METHOD 1.Data obtained with shielding around chamber 2269800200006 2.Data obtained without shielding around chamber 2269800200007 INC-SPECT Standard deviation from the mean incident neutron 2269800200008 energy is less than 70 keV at all energies. 2269800200009 ERR-ANALYS (DATA-ERR) No information on the source of uncertainty 2269800200010 STATUS (TABLE) Table I of phys.Rev.Lett.88(2002)062502 2269800200011 (SPSDD,22698005) Final data without shielding 2269800200012 (SPSDD,22698007) Final data with shielding 2269800200013 HISTORY (20110106A) On. 2.93 b -> 1.93 b at 3.0 MeV 2269800200014 (20201216A) On. EN-ERR=70 keV deleted. 2269800200015 ENDBIB 13 0 2269800200016 NOCOMMON 0 0 2269800200017 DATA 5 4 2269800200018 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2 2269800200019 MEV B B B B 2269800200020 1.0 2.71 0.03 1.95 0.04 2269800200021 1.6 2.07 0.02 1.92 0.04 2269800200022 2.0 2.05 0.04 1.99 0.04 2269800200023 3.0 1.93 0.04 2269800200024 ENDDATA 6 0 2269800200025 ENDSUBENT 24 0 2269800299999 SUBENT 22698003 20201216 22972269800300001 BIB 7 22 2269800300002 REACTION (91-PA-233(N,F),,SIG) 2269800300003 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) 2269800300004 SAMPLE 233Pa sample (0.564+/-0.025 ug). 2269800300005 The mass was determined by gamma-counting right after 2269800300006 preparation, and verified after several months by 2269800300007 alpha-spectroscopy of 233U into which 233Pa had 2269800300008 decayed. 2269800300009 CORRECTION Corrected for 233U fission due to decay of 233Pa 2269800300010 ERR-ANALYS (DATA-ERR) Statistical and systematic uncertainties 2269800300011 including parameters in the uncertainties of 2269800300012 - 237Np and 233Pa mass 2269800300013 - 237Np(n,f) cross section (~1%) 2269800300014 - 233U(n,f) cross section (~2%) 2269800300015 STATUS (TABLE) Table ii of phys.Rev.Lett.88(2002)062502 2269800300016 (SPSDD,22698006) Data from 1st, 2nd and 3rd campaigns 2269800300017 HISTORY (20031230A) SAN 003 and 004 merged as representing 2269800300018 data for the same reaction but different energies. 2269800300019 Error structure is given. 2269800300020 (20040802A) Data units corrected 2269800300021 (20080108U) DATA-ERR changed to ERR-T, DATA-ERR1, 2269800300022 DATA-ERR2 changed to ERR-1, ERR-3. ERR-SYS given. 2269800300023 (20201216S) On. Restored. ERR-T->DATA-ERR. Superseded. 2269800300024 ENDBIB 22 0 2269800300025 NOCOMMON 0 0 2269800300026 DATA 3 4 2269800300027 EN DATA DATA-ERR 2269800300028 MEV B B 2269800300029 1.0 -21. 54. 2269800300030 1.6 384. 27. 2269800300031 2.0 342. 23. 2269800300032 3.0 371. 36. 2269800300033 ENDDATA 6 0 2269800300034 ENDSUBENT 33 0 2269800399999 SUBENT 22698004 20201216 22972269800400001 BIB 7 15 2269800400002 REACTION (91-PA-233(N,F),,SIG) 2269800400003 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) for En=1.0-3.8 MeV 2269800400004 (D-D) TiD or D2 gas (~200 kPa) for En=5.0-8.5 MeV 2269800400005 CORRECTION Corrected for 233U fission due to decay of 233Pa 2269800400006 FLAG (1.) 1st campaign 2269800400007 (2.) 2nd campaign 2269800400008 (3.) Measured twice at 7.5 MeV 2269800400009 ERR-ANALYS (DATA-ERR) Statistical and systematic uncertainties 2269800400010 including parameters in the uncertainties of 2269800400011 - 237Np and 233Pa mass 2269800400012 - 237Np(n,f) cross section (~1%) 2269800400013 - 233U(n,f) cross section (~2%) 2269800400014 STATUS (TABLE) Table 1 of ISINN-10,202,2003 2269800400015 (SPSDD,22698006) Data from 1st, 2nd and 3rd campaigns 2269800400016 HISTORY (20201216S) On. Restored. Superseded. 2269800400017 ENDBIB 15 0 2269800400018 NOCOMMON 0 0 2269800400019 DATA 5 10 2269800400020 EN DATA DATA-ERR FLAG FLAG 2269800400021 MEV B B NO-DIM NO-DIM 2269800400022 1.0 -21. 54. 1. 2269800400023 1.6 384. 27. 1. 2269800400024 2.0 342. 23. 1. 2269800400025 3.0 371. 36. 1. 2269800400026 5.0 347. 155. 2. 2269800400027 6.0 294. 29. 2. 2269800400028 6.75 401. 46. 2. 2269800400029 7.5 651. 67. 2. 3. 2269800400030 7.5 717. 189. 2. 3. 2269800400031 8.5 577. 79. 2. 2269800400032 ENDDATA 12 0 2269800400033 ENDSUBENT 32 0 2269800499999 SUBENT 22698005 20201216 22972269800500001 BIB 7 20 2269800500002 REACTION (92-U-233(N,F),,SIG) 2269800500003 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) for En=1.0-3.8 MeV 2269800500004 (D-D) D2 gas (~200 kPa) for En=5.0-8.5 MeV 2269800500005 METHOD Data obtained without shielding around chamber 2269800500006 ERR-ANALYS Andreas Oberstedt (2008-03-05): 2269800500007 The quoted uncertainty is the combined systematic and 2269800500008 statistical error. The statistical part is small, 2269800500009 well below 1%. 2269800500010 (ERR-T) Combined systematic and statistical error 2269800500011 (ERR-1) 237Np mass (1.4%) 2269800500012 (ERR-2) 237Np(n,f) cross section (1%) 2269800500013 FLAG (1.) EN-ERR=0.07 MeV in data received from author 2269800500014 (2.) EN-ERR=0.05 MeV in data received from author 2269800500015 STATUS (TABLE) Table 4.1 (left)+appendix of Tovesson's thesis 2269800500016 (COREL,22698007) Data measured without shielding 2269800500017 HISTORY (20040607R) Received from A.Oberstedt and F.-J.Hambsch 2269800500018 (20040802C) 2269800500019 (20080108U) Last checking has been done. 2269800500020 (20110106A) On. ERR-S deleted from common. 2269800500021 (20201216A) On. Partial uncertainties added. 2269800500022 ENDBIB 20 0 2269800500023 COMMON 2 3 2269800500024 ERR-1 ERR-2 2269800500025 PER-CENT PER-CENT 2269800500026 1.4 1. 2269800500027 ENDCOMMON 3 0 2269800500028 DATA 5 9 2269800500029 EN EN-ERR DATA ERR-T FLAG 2269800500030 MEV MEV B B NO-DIM 2269800500031 1.00 0.06 1.95 0.03 2269800500032 1.60 0.05 1.92 0.04 2269800500033 2.00 0.04 1.99 0.04 2269800500034 3.00 0.04 1.97 0.03 2269800500035 3.80 0.03 1.88 0.03 2269800500036 5.00 0.10 1.70 0.03 2269800500037 5.50 0.14 1.58 0.03 2269800500038 6.00 0.12 1.89 0.03 1. 2269800500039 7.50 0.08 2.24 0.04 2. 2269800500040 ENDDATA 11 0 2269800500041 ENDSUBENT 40 0 2269800599999 SUBENT 22698006 20201216 22972269800600001 BIB 9 42 2269800600002 REACTION (91-PA-233(N,F),,SIG) 2269800600003 DECAY-DATA (91-PA-233,27.0D) 2269800600004 SAMPLE Three 233Pa samples (0.564+/-0.025, 0.425+/-0.026 and 2269800600005 1.09+/-0.05 ug). 2269800600006 The mass was determined by gamma-counting right after 2269800600007 preparation, and then determined by counting 233U 2269800600008 decay alpha ~3-7 months after sample production. 2269800600009 CORRECTION Corrected for 233U fission due to decay of 233Pa 2269800600010 FLAG (1.) 1st campaign 2269800600011 (2.) 2nd campaign 2269800600012 (3.) 3rd campaign 2269800600013 (4.) Measured twice at 3.0 and 7.5 MeV 2269800600014 (5.) Negative cross section de to subtraction of the 2269800600015 233U events. Must be interpreted as a cross section 2269800600016 equal to zero within the uncertainty. 2269800600017 CRITIQUE By compiler (2021-03-24): 2269800600018 The total uncertainty (ERR-T) is smaller than 20% 2269800600019 (ERR-8) except for En=5.0, 5.5, 7.5 and 8.5 MeV. 2269800600020 ERR-ANALYS Fredrik Tovesson (2011-01-05): 2269800600021 The quoted uncertainty includes counting statistics 2269800600022 and systematic uncertainties including 237Np(n,f) and 2269800600023 233U(n,f) cross section and background subtractions. 2269800600024 For first chance fission the sample mass 2269800600025 uncertainties are dominating, while for second chance 2269800600026 fission the background subtraction due to a tail in 2269800600027 the neutron spectrum is dominating. 2269800600028 (ERR-T) Combined systematic and statistical error 2269800600029 taking into account uncertainties in various 2269800600030 parameters: 2269800600031 (ERR-1,,0.2,U) counts - 237Np (<0.2%) 2269800600032 (ERR-2,2.,6.,U) counts - 233Pa and 233U (2-6%) 2269800600033 (ERR-3) 237Np mass (1.4%) (1.4%) 2269800600034 (ERR-4,4.5,6.) 233Pa in each sample (4.5-6%) 2269800600035 (ERR-5,1.,2.) 233U cross section (1-2%) 2269800600036 (ERR-6) 237Np cross section (1%) 2269800600037 (ERR-7) 237P decay constant (7.5E-3%) 2269800600038 (ERR-8) parasitic neutron fraction (20%) 2269800600039 STATUS (TABLE) Table 4.2+Appendix of Tovesson's thesis 2269800600040 HISTORY (20040802C) 2269800600041 (20080108U) Last checking has been done. 2269800600042 (20110106A) On. ERR-ANALYS: source information added 2269800600043 (20201216A) On. ERR-ANALYS updated. 2269800600044 ENDBIB 42 0 2269800600045 COMMON 4 3 2269800600046 ERR-3 ERR-6 ERR-7 ERR-8 2269800600047 PER-CENT PER-CENT PER-CENT PER-CENT 2269800600048 1.4 1. 7.5E-03 20. 2269800600049 ENDCOMMON 3 0 2269800600050 DATA 6 16 2269800600051 EN EN-ERR DATA ERR-T FLAG FLAG 2269800600052 MEV MEV B B NO-DIM NO-DIM 2269800600053 1.00 0.06 -0.021 0.060 1. 5. 2269800600054 1.20 0.06 0.155 0.019 3. 2269800600055 1.40 0.05 0.268 0.030 3. 2269800600056 1.50 0.05 0.288 0.042 3. 2269800600057 1.60 0.05 0.384 0.027 1. 2269800600058 2.00 0.04 0.342 0.023 1. 2269800600059 3.00 0.04 0.371 0.036 1. 4. 2269800600060 3.00 0.04 0.426 0.040 3. 4. 2269800600061 3.80 0.03 0.336 0.054 3. 2269800600062 5.00 0.10 0.342 0.154 2. 2269800600063 5.50 0.14 0.312 0.083 3. 2269800600064 6.00 0.07 0.390 0.056 2. 2269800600065 6.75 0.06 0.490 0.098 2. 2269800600066 7.50 0.05 0.827 0.146 4. 2269800600067 7.50 0.08 0.490 0.187 4. 2269800600068 8.50 0.04 0.699 0.149 2. 2269800600069 ENDDATA 18 0 2269800600070 ENDSUBENT 69 0 2269800699999 SUBENT 22698007 20201216 22972269800700001 BIB 8 18 2269800700002 REACTION (92-U-233(N,F),,SIG,,RAW) 2269800700003 Not corrected for impact from scattered neutrons 2269800700004 INC-SOURCE (P-T) TiT (2 mg/cm2 thick) for EN=1.0-3.8 MeV 2269800700005 (D-D) TiD or D2 gas (~200 kPa) for EN=5.0-8.5 MeV 2269800700006 METHOD Data obtained with shielding around chamber 2269800700007 ERR-ANALYS (ERR-T) Combined systematic and statistical error 2269800700008 (ERR-1) 237Np mass (1.4%) 2269800700009 (ERR-2) 237Np(n,f) cross section (1%) 2269800700010 FLAG (1.) TiT for neutron production 2269800700011 (2.) TiD for neutron production 2269800700012 (3.) D2 gas for neutron production 2269800700013 COMMENT By authors: 2269800700014 Parasitic neutrons may be produced by 2269800700015 (1.) neutrons production on shielding material 2269800700016 (2.) 16O(d,n)17F from oxygen in the TiD target 2269800700017 STATUS (TABLE) Table 4.1 (right)+appendix of Tovesson's thesis2269800700018 (COREL,22698005) Data measured without shielding 2269800700019 HISTORY (20201216C) On 2269800700020 ENDBIB 18 0 2269800700021 COMMON 2 3 2269800700022 ERR-1 ERR-2 2269800700023 PER-CENT PER-CENT 2269800700024 1.4 1. 2269800700025 ENDCOMMON 3 0 2269800700026 DATA 5 15 2269800700027 EN EN-ERR DATA ERR-T FLAG 2269800700028 MEV MEV B B NO-DIM 2269800700029 1.00 0.06 2.71 0.03 1. 2269800700030 1.20 0.06 2.29 0.03 1. 2269800700031 1.40 0.05 2.18 0.03 1. 2269800700032 1.50 0.05 2.16 0.03 1. 2269800700033 1.60 0.05 2.07 0.02 1. 2269800700034 2.00 0.04 2.05 0.04 1. 2269800700035 3.00 0.04 1.93 0.04 1. 2269800700036 3.80 0.03 1.90 0.03 1. 2269800700037 5.00 0.10 1.63 0.03 2. 2269800700038 5.50 0.14 1.57 0.03 3. 2269800700039 6.00 0.07 2.47 0.03 2. 2269800700040 6.75 0.06 2.45 0.04 2. 2269800700041 7.50 0.05 2.61 0.04 2. 2269800700042 7.50 0.08 2.22 0.04 2. 2269800700043 8.50 0.04 2.76 0.04 2. 2269800700044 ENDDATA 17 0 2269800700045 ENDSUBENT 44 0 2269800799999 ENDENTRY 7 0 2269899999999