ENTRY 23299 20210615 23002329900000001 SUBENT 23299001 20210615 23002329900100001 BIB 16 76 2329900100002 TITLE Comparative measurement of prompt fission gamma-ray 2329900100003 emission from fast-neutron-induced fission of 235U and 2329900100004 238U. 2329900100005 AUTHOR (M.Lebois,J.N.Wilson,P.Halipre,A.Oberstedt,S.Oberstedt,2329900100006 P.Marini,C.Schmitt,S.J.Rose,S.Siem, M.Fallot,A.Porta, 2329900100007 A.-A.Zakari) 2329900100008 INSTITUTE (2FR PAR) Institut de Physique Nucleaire d'Orsay. 2329900100009 M.Lebois, J.N.Wilson, P.Halipre 2329900100010 (2SWDCTH) A.Oberstedt 2329900100011 (2ZZZGEL) S.Oberstedt 2329900100012 (2FR GAN) P.Marini,C.Schmitt 2329900100013 (2NOROSL) S.J.Rose,S.Siem 2329900100014 (2FR NTE) M.Fallot,A.Porta,A.-A.Zakari 2329900100015 REFERENCE (J,PR/C,92,034618,2015) 2329900100016 #doi:10.1103/PhysRevC.92.034618 2329900100017 (J,PPRC,64,107,2015) First author J.N.Wilson . 2329900100018 #doi:10.1016/j.phpro.2015.04.014 2329900100019 Details of setup. 2329900100020 REL-REF (M,23197001,R.Billnert+,J,PR/C,87,024601,2013) 2329900100021 Procedure of correction. 2329900100022 (R,31729001,A.Oberstedt+,J,PR/C,87,051602,2013) 2329900100023 FACILITY (VDGT,2FR PAR) Tandem accelerator of the ALTO facility 2329900100024 of the IPN Orsay. 2329900100025 INC-SOURCE (P-LI7) LICORNE (Lithium Inverse Cinematiques ORsay 2329900100026 NEutron source) Li7 beam of 15 MeV energy, maximum 2329900100027 intensity 100 nA bombarded rotating hydrogen-rich 2329900100028 polypropylene target discs of 8 cm diameter, 20 microm 2329900100029 thickness. 2329900100030 INC-SPECT Neutron flux up to 10**7 n/sec. Average energy 1.7 MeV.2329900100031 A neutron flux up to 3*10**5 n/s/cm2 at the target 2329900100032 position. 2329900100033 SAMPLE Two targets of 235U and 238U of around 300 microg/cm2 2329900100034 thickness, 6.5cm diameter were placed back to back at 2329900100035 the central cathode of ionization chamber. 2329900100036 235U mass 12.1 +- 0.6 mg; 238U mass 9.5 +- 0.5 mg. 2329900100037 METHOD (PHD,COINC) 2329900100038 (TOF) The time of flight technique with the combined 2329900100039 time resolution of the ionization chamber and BaF2 2329900100040 detector being 4.2 ns FWHM - for prompt neutron/gamma 2329900100041 discrimination. Possible for neutrons up to 10 MeV. 2329900100042 PART-DET (G,FF,N) Fission fragments, gammas, neutrons 2329900100043 DETECTOR (IOCH) Twin Frisch-grid ionization chamber, filled with2329900100044 P10 counting gas at a pressure of 1.2 atm - for fission2329900100045 fragments detection. Placed at 15 cm from the neutron 2329900100046 source. 2329900100047 (BAF2) 14 hexagonal BaF2 crystals of 10 cm diameter, 2329900100048 14 cm length - for coincident fission gamma rays 2329900100049 detection. Calibrated in energy with 137Cs, 60Co,152Eu,2329900100050 232Th, AmBe sources in energy range 121 keV - 4.4 MeV. 2329900100051 Detector responses to monoenergetic photons of energies2329900100052 between 0 and 10 MeV were obtained via simulating 2329900100053 emission from the 235U and 238U targets at the center 2329900100054 of the ionization chamber for each detector energy bin.2329900100055 Response matrices were then created from the ensemble 2329900100056 of the resulting simulated detected spectra. 2329900100057 Detector threshold about 400 keV. 2329900100058 ADD-RES Fitted exponential parameters to the high-energy tails2329900100059 (above 2 MeV) of emitted prompt fission gamma spectra 2329900100060 Table II of PR/C,92,034618,2015: 2329900100061 U-235 - -0.86+-0.09 MeV**-2 2329900100062 U-238 - -0.68+-0.10 MeV**-2 2329900100063 U-235 - -0.940+-0.017 MeV**-2 - for thermal neutrons 2329900100064 from experiment described in: 2329900100065 A.Oberstedt+,J,PR/C,87,051602,2013. 2329900100066 ERR-ANALYS Statistical errors are the dominant source of 2329900100067 uncertainty in the emission spectra. 2329900100068 The systematic error comes from the normalization and 2329900100069 could be as high as 40%. However, this systematic error2329900100070 cancels when we take the ratio of 235U/238U spectra. 2329900100071 COMMENT This work was supported by the European Commission 2329900100072 within the framework of the ERINDA programme (agreement2329900100073 number 269499). 2329900100074 HISTORY (20151223C) M.M. 2329900100075 Request for the data was sent 17.03.2016 . 2329900100076 (20160718A) M.M. Data were added in Subents 5,6. 2329900100077 (20210615A) VS. 003 and 005 superseded. 2329900100078 ENDBIB 76 0 2329900100079 COMMON 1 3 2329900100080 EN 2329900100081 MEV 2329900100082 1.7 2329900100083 ENDCOMMON 3 0 2329900100084 ENDSUBENT 83 0 2329900199999 SUBENT 23299002 20151223 22482329900200001 BIB 3 11 2329900200002 REACTION 1((92-U-235(N,F)0-G-0,PR,FY)/ 2329900200003 (92-U-238(N,F)0-G-0,PR,FY)) 2329900200004 Mean photon multiplicities ratio. 2329900200005 2((92-U-235(N,F)0-G-0,PR,KE)/ 2329900200006 (92-U-238(N,F)0-G-0,PR,KE)) 2329900200007 Mean photon energies ratio. 2329900200008 3((92-U-235(N,F)0-G-0,PR,KE,,MSC)/ 2329900200009 (92-U-238(N,F)0-G-0,PR,KE,,MSC)) 2329900200010 Total radiation energy releases (per fission) ratio. 2329900200011 ERR-ANALYS (DATA-ERR) Type of error is not explained in article. 2329900200012 STATUS (TABLE) Table I of PR/C,92,034618,2015 2329900200013 ENDBIB 11 0 2329900200014 NOCOMMON 0 0 2329900200015 DATA 6 1 2329900200016 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 32329900200017 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 2329900200018 1.008 0.090 0.976 0.040 1.003 0.070 2329900200019 ENDDATA 3 0 2329900200020 ENDSUBENT 19 0 2329900299999 SUBENT 23299003 20210615 23002329900300001 BIB 6 16 2329900300002 REACTION (92-U-235(N,F)0-G-0,PR,KE) 2329900300003 Mean photon energy. 2329900300004 CORRECTION For contribution from the lowest energy gamma rays 2329900300005 below detection threshold by extrapolation according to2329900300006 the method detailed in: 2329900300007 REL-REF (M,31729001,A.Oberstedt+,J,PR/C,87,051602,2013) 2329900300008 (M,,A.Oberstedt+,J,PR/C,92,014618,2015) 2329900300009 (A,31729010,A.Oberstedt+,J,PR/C,87,051602,2013) 2329900300010 0.85+-0.02 MeV 2329900300011 (D,14361001,A.Chyzh+,J,PR/C,87,034620,2013) 2329900300012 ERR-ANALYS (ERR-T) Total error including: 2329900300013 (ERR-1) Uncertainty of correction 2329900300014 STATUS (TABLE) Text, page 034618-3 of 2329900300015 Phys.Rev.C,92,034618,2015. 2329900300016 (SPSDD,23775006) Re-analysed data. 2329900300017 HISTORY (20210615A) VS. Subentry superseded. 2329900300018 ENDBIB 16 0 2329900300019 NOCOMMON 0 0 2329900300020 DATA 3 1 2329900300021 DATA ERR-T ERR-1 2329900300022 MEV MEV PER-CENT 2329900300023 0.76 0.04 35. 2329900300024 ENDDATA 3 0 2329900300025 ENDSUBENT 24 0 2329900399999 SUBENT 23299004 20151223 22482329900400001 BIB 5 11 2329900400002 REACTION (92-U-238(N,F)0-G-0,PR,KE) 2329900400003 Mean photon energy . 2329900400004 CORRECTION For contribution from the lowest energy gamma rays 2329900400005 below detection threshold by extrapolation according to2329900400006 the method detailed in: 2329900400007 REL-REF (M,31729001,A.Oberstedt+,J,PR/C,87,051602,2013) 2329900400008 (M,,A.Oberstedt+,J,PR/C,92,014618,2015) 2329900400009 0.85+-0.02 MeV 2329900400010 ERR-ANALYS (ERR-T) Total error including : 2329900400011 (ERR-1) Uncertainty of correction 2329900400012 STATUS (TABLE) Text, page 034618-3 of PR/C,92,034618,2015. 2329900400013 ENDBIB 11 0 2329900400014 NOCOMMON 0 0 2329900400015 DATA 3 1 2329900400016 DATA ERR-T ERR-1 2329900400017 MEV MEV PER-CENT 2329900400018 0.77 0.06 35. 2329900400019 ENDDATA 3 0 2329900400020 ENDSUBENT 19 0 2329900499999 SUBENT 23299005 20210615 23002329900500001 BIB 8 21 2329900500002 REACTION (92-U-235(N,F)0-G-0,PR,FY/DE,,REL) 2329900500003 Prompt fission gamma spectrum 2329900500004 EN-SEC (E,G) Gamma energy 2329900500005 MISC-COL (MISC) Linear fit above 2 MeV 2329900500006 COMMENT Of author J.Wilson. 2329900500007 The data in fig.3 are the same as those for fig.2 only 2329900500008 with a re-normalization of around 30% to the thermal 2329900500009 neutron data for a comparison of spectral shapes only. 2329900500010 We cannot determine the absolute value accurately, or 2329900500011 to put another way - there is a large systematic 2329900500012 error on the absolute values. 2329900500013 REL-REF (N,,R.Billnert+,J,PPRC,59,17,2014) 2329900500014 Compared with shape of thermal-neutron-induced fission 2329900500015 prompt gamma spectrum on Fig.3 of PR/C,92,034618,2015 2329900500016 ERR-ANALYS (ERR-S) Statistical uncertainty 2329900500017 STATUS (TABLE) From author J.Wilson. 2329900500018 Fig.2 of Phys.Rev.C,92,034618,2015 2329900500019 (SPSDD,23775002) Re-analysed data. 2329900500020 HISTORY (20160718R) M.M. Data were added . 2329900500021 REL was added in reaction - see comment of author. 2329900500022 (20210615A) VS. Subentry superseded. 2329900500023 ENDBIB 21 0 2329900500024 NOCOMMON 0 0 2329900500025 DATA 4 21 2329900500026 E DATA ERR-S MISC 2329900500027 MEV ARB-UNITS ARB-UNITS ARB-UNITS 2329900500028 0.493446 7.44886 0.227673 2329900500029 0.622685 6.47719 0.20253 2329900500030 0.767865 4.40232 0.159406 2329900500031 0.929084 3.33592 0.137441 2329900500032 1.10642 2.30018 0.114338 2329900500033 1.29995 2.16551 0.109737 2329900500034 1.50971 1.40465 0.0916977 2329900500035 1.73577 0.995538 0.0781061 2329900500036 1.97816 0.618668 0.0618848 0.64452503 2329900500037 2.23693 0.499855 0.0579473 0.51558029 2329900500038 2.5121 0.42419 0.0507786 0.40663884 2329900500039 2.8037 0.256733 0.0407196 0.31620317 2329900500040 3.11176 0.276765 0.0416495 0.24241368 2329900500041 3.43631 0.177645 0.0373199 0.18321894 2329900500042 3.77736 0.136442 0.0325635 0.13652185 2329900500043 4.13494 0.0866533 0.0283353 0.10028623 2329900500044 4.50906 0.0814626 0.0305991 0.072624652 2329900500045 4.89973 0.0743974 0.0323268 0.051847359 2329900500046 5.30698 0.0271991 0.0285174 0.036488652 2329900500047 5.73081 0.0660536 0.024894 0.025314981 2329900500048 6.17125 0.00733998 0.0234923 0.017313097 2329900500049 ENDDATA 23 0 2329900500050 ENDSUBENT 49 0 2329900599999 SUBENT 23299006 20160718 22512329900600001 BIB 6 10 2329900600002 REACTION (92-U-238(N,F)0-G-0,PR,FY/DE,,REL) 2329900600003 Prompt fission gamma spectrum 2329900600004 EN-SEC (E,G) Gamma energy 2329900600005 MISC-COL (MISC) Linear fit above 2 MeV 2329900600006 ERR-ANALYS (ERR-S) Statistical uncertainty 2329900600007 STATUS (TABLE) From author J.Wilson . 2329900600008 Fig.2 of PR/C,92,034618,2015 2329900600009 HISTORY (20160718R) M.M. Data were added . 2329900600010 REL was added in reaction - see comment of author in 2329900600011 Subent 005. 2329900600012 ENDBIB 10 0 2329900600013 NOCOMMON 0 0 2329900600014 DATA 4 21 2329900600015 E DATA ERR-S MISC 2329900600016 MEV ARB-UNITS ARB-UNITS ARB-UNITS 2329900600017 0.493446 9.02122 0.467424 2329900600018 0.622685 6.51012 0.387494 2329900600019 0.767865 4.08802 0.297798 2329900600020 0.929084 2.97214 0.251367 2329900600021 1.10642 2.13254 0.211314 2329900600022 1.29995 1.5429 0.173111 2329900600023 1.50971 0.876158 0.137787 2329900600024 1.73577 1.0997 0.150864 2329900600025 1.97816 0.606504 0.113885 0.56544964 2329900600026 2.23693 0.43099 0.0984644 0.4743042 2329900600027 2.5121 0.516289 0.102078 0.39344317 2329900600028 2.8037 0.250167 0.0674427 0.32274552 2329900600029 3.11176 0.203839 0.0605601 0.26180789 2329900600030 3.43631 0.160723 0.0583251 0.21001036 2329900600031 3.77736 0.188623 0.0606335 0.1665832 2329900600032 4.13494 0.140249 0.0528825 0.13066081 2329900600033 4.50906 0.0759244 0.0504776 0.10133984 2329900600034 4.89973 0.28569 0.0862517 0.07772001 2329900600035 5.30698 0.0655377 0.0537613 0.058937863 2329900600036 5.73081 0.0242115 0.0358147 0.044194155 2329900600037 6.17125 0.0272037 0.0447106 0.032766899 2329900600038 ENDDATA 23 0 2329900600039 ENDSUBENT 38 0 2329900699999 ENDENTRY 6 0 2329999999999