ENTRY 23208 20140918 22392320800000001 SUBENT 23208001 20140918 22392320800100001 BIB 14 57 2320800100002 TITLE Measurement of fission yields from the 241Am(2nth,f) 2320800100003 reaction at the Lohengrin Spectrometer. 2320800100004 AUTHOR (Ch.Amouroux, A.Blanc, A.Bidaud, N.Capellan, S.Chabod, 2320800100005 A.Chebboubi, H.Faust, G.Kessedjian, U.Koester, 2320800100006 J.-F.Lemaitre, A.Letourneau, F.Martin, T.Materna, 2320800100007 S.Panebianco, Ch.Sage, O.Serot) 2320800100008 INSTITUTE (2FR SAC) Ch.Amouroux,J.-F.Lemaitre,A.Letourneau, 2320800100009 T.Materna,S.Panebianco. 2320800100010 (2FR GRE) A.Blanc,A.Bidaud, N.Capellan, S.Chabod, 2320800100011 A.Chebboubi,G.Kessedjian,F.Martin,Ch.Sage. 2320800100012 (2FR ILL) H.Faust,U.Koester. 2320800100013 (2FR CAD) O.Serot. 2320800100014 (2FR BRC) J.-F.Lemaitre. 2320800100015 REFERENCE (J,EPJ/CS,62,06002,2013) Preliminary. Figures only. 2320800100016 #doi:10.1051/epjconf/20136206002 2320800100017 FACILITY (REAC,2FR ILL) High flux reactor of Laue-Langevin 2320800100018 Institute in Grenoble. 2320800100019 INC-SOURCE (REAC) 2320800100020 INC-SPECT High thermal neutron flux 5.E+14 n/cm**2/s. 2320800100021 DECAY-DATA (95-AM-242-G,16.02HR) 2320800100022 (95-AM-242-M,141.YR) 2320800100023 SAMPLE The target is placed 50 cm away from the core of the 2320800100024 reactor. It consists in a 300 microg/cm2 thick deposit 2320800100025 of 241Am (purity > 99%) on a Ti backing and is covered 2320800100026 by a 0.25 microm thick nickel foil. 2320800100027 The double capture reaction was used to overcome the 2320800100028 impossibility of using a 242Am target and to 2320800100029 produce 242Am in both its isomeric and ground states. 2320800100030 METHOD (OLMS) On-line fission studies combined with a mass and2320800100031 energy separation of fission products thanks to the 2320800100032 mass spectrometer Lohengrin. The fission products fly 2320800100033 through a beam pipe under vacuum to reach the mass 2320800100034 spectrometer Lohengrin, composed of a dipole magnet 2320800100035 followed by an electrostatic deflector. 2320800100036 A second magnet called RED Magnet (Reverse Energy 2320800100037 Dispersion) allows to switch between an ionization 2320800100038 chamber in straight direction (mass measurements) or 2320800100039 refocus into a vacuum chamber with a tape where 2320800100040 fragments are implanted (isotopic measurements). 2320800100041 When the fragments are deflected and implanted on a 2320800100042 tape, gamma rays produced after beta decay are 2320800100043 registered with two high-efficiency HPGe clover 2320800100044 detectors placed around the implantation position. 2320800100045 All the measurements were normalized to the fission 2320800100046 yield of a mass A = 105, typically the most produced 2320800100047 one, which is measured every 8 or 12h. 2320800100048 DETECTOR (IOCH) The ionization chamber measures the energy of 2320800100049 the fission product. 2320800100050 (HPGE) Two high-efficiency HPGe clover detectors - to 2320800100051 gamma registration. 2320800100052 The neutron flux variation was measured with 3He 2320800100053 detectors. 2320800100054 ADD-RES Ionic charge distributions for Xe-137, I-137, Xe-140, 2320800100055 Cs-140 on Fig.4 of J,EPJ/CS,62,06002,2013. 2320800100056 STATUS (APRVD) Approved by author Ch.Amouroux 18.09.2014. 2320800100057 HISTORY (20140108C) M.M. 2320800100058 (20140212R) Data received 12.02.2014 from Ch.Amouroux 2320800100059 ENDBIB 57 0 2320800100060 COMMON 1 3 2320800100061 EN-DUMMY 2320800100062 EV 2320800100063 0.0253 2320800100064 ENDCOMMON 3 0 2320800100065 ENDSUBENT 64 0 2320800199999 SUBENT 23208002 20140918 22392320800200001 BIB 6 22 2320800200002 REACTION (95-AM-242-M(N,F)MASS,SEC,KE) 2320800200003 Most probable kinetic energy of the fission fragments 2320800200004 as a function of their mass. 2320800200005 Distribution is not Gaussian. 2320800200006 MONITOR (95-AM-242-M(N,F)MASS,SEC,KE) 2320800200007 Normalization KE(A=105)=103.57 MeV 2320800200008 REL-REF (R,,U.Guettler,T,GUETTLER,1991) 2320800200009 Ph.D.Thesis, Johannes Gutenberg-Universitat Mainz, 2320800200010 1991 (in German). 2320800200011 ANALYSIS The kinetic energy mean value of the mass 105 measured 2320800200012 by U.Guettler at the Lohengrin spectrometer in 1991 2320800200013 was used to normalize the data. 2320800200014 ERR-ANALYS (DATA-ERR) Total uncertainty on the KE: 2320800200015 - 0.6 MeV due to the determination method of the most 2320800200016 probable value from the measured energy distribution2320800200017 - 0.6 MeV due to the correlation between the energy 2320800200018 and the ionic charge; estimated from the data 2320800200019 obtained in other experiments. 2320800200020 - Normalization at A=105 (idem: 0.6 + 0.6 MeV) 2320800200021 STATUS (TABLE) From author Ch.Amouroux 12.02.2014 2320800200022 (PRELM) 2320800200023 Preliminary data on Fig.1 of J,EPJ/CS,62,06002,2013 . 2320800200024 ENDBIB 22 0 2320800200025 COMMON 2 3 2320800200026 MASS-NRM MONIT 2320800200027 NO-DIM MEV 2320800200028 105. 103.57 2320800200029 ENDCOMMON 3 0 2320800200030 DATA 3 40 2320800200031 MASS DATA DATA-ERR 2320800200032 NO-DIM MEV MEV 2320800200033 91. 104.3 1.2 2320800200034 92. 103.2 1.2 2320800200035 93. 104.1 1.2 2320800200036 94. 105.7 1.2 2320800200037 95. 101.6 1.2 2320800200038 96. 105.5 1.2 2320800200039 97. 105.6 1.2 2320800200040 98. 104.3 1.2 2320800200041 99. 104.4 1.2 2320800200042 100. 103.0 1.2 2320800200043 101. 104.8 1.2 2320800200044 102. 104.2 1.2 2320800200045 103. 104.0 1.2 2320800200046 104. 104.2 1.2 2320800200047 106. 104.0 1.2 2320800200048 107. 102.0 1.2 2320800200049 108. 102.3 1.2 2320800200050 109. 101.3 1.2 2320800200051 110. 102.7 1.2 2320800200052 129. 89.3 1.2 2320800200053 130. 85.6 1.2 2320800200054 131. 85.4 1.2 2320800200055 132. 85.3 1.2 2320800200056 133. 80.8 1.2 2320800200057 134. 83.0 1.2 2320800200058 135. 82.1 1.2 2320800200059 136. 78.6 1.2 2320800200060 137. 79.5 1.2 2320800200061 138. 78.0 1.2 2320800200062 139. 76.2 1.2 2320800200063 140. 75.4 1.2 2320800200064 141. 74.8 1.2 2320800200065 142. 73.4 1.2 2320800200066 143. 72.0 1.2 2320800200067 144. 73.2 1.2 2320800200068 145. 69.3 1.2 2320800200069 146. 69.2 1.2 2320800200070 147. 66.8 1.2 2320800200071 148. 68.2 1.2 2320800200072 149. 67.9 1.2 2320800200073 ENDDATA 42 0 2320800200074 ENDSUBENT 73 0 2320800299999 SUBENT 23208003 20140918 22392320800300001 BIB 6 24 2320800300002 REACTION (95-AM-242-M(N,F)MASS,SEC,FY) 2320800300003 MONITOR (95-AM-242-M(N,F)MASS,SEC,FY) 2320800300004 Each mass yield is normalized to the yield of the mass 2320800300005 105 (Y105 = 6.5%, according to JEFF-3.1.1). 2320800300006 MONIT-REF (,,3,JEFF-3.1.1,,2009) 2320800300007 REL-REF (A,13295001,K.Wolfsberg+,J,PR/C,3,1333,1971) 2320800300008 ERR-ANALYS (ERR-T) Total uncertainty: 2320800300009 (ERR-S) Statistical uncertainty about - 1 %. 2320800300010 (ERR-SYS) Total of the systematic error - 5.5% . 2320800300011 Sources of relative systematic uncertainties and their 2320800300012 respective contributions: 2320800300013 (ERR-1) Extrapolation of the low part of the energy 2320800300014 distribution - 1.5% . 2320800300015 (ERR-2) Extrapolation of the high part of the energy 2320800300016 distribution - 1% . 2320800300017 (ERR-3) Reproducibility - 3% . 2320800300018 (ERR-4) Correlation between E and q - 3% . 2320800300019 (ERR-5) Relative normalization (burn-up) - about 3% . 2320800300020 STATUS (TABLE) From author Ch.Amouroux 12.02.2014 . 2320800300021 (PRELM) 2320800300022 Preliminary data are on Fig.3 of J,EPJ/CS,62,06002,20132320800300023 for masses 91-149. 2320800300024 Preliminary data are on Fig.2 of J,EPJ/CS,62,06002,20132320800300025 for masses 134-142. 2320800300026 ENDBIB 24 0 2320800300027 COMMON 9 6 2320800300028 MASS-NRM MONIT ERR-S ERR-SYS ERR-1 ERR-2 2320800300029 ERR-3 ERR-4 ERR-5 2320800300030 NO-DIM PC/FIS PER-CENT PER-CENT PER-CENT PER-CENT 2320800300031 PER-CENT PER-CENT PER-CENT 2320800300032 105. 6.5 1. 5.5 1.5 1. 2320800300033 3. 3. 3. 2320800300034 ENDCOMMON 6 0 2320800300035 DATA 3 40 2320800300036 MASS DATA ERR-T 2320800300037 NO-DIM PC/FIS PC/FIS 2320800300038 91. 1.89 0.11 2320800300039 92. 2.29 0.13 2320800300040 93. 2.6 0.16 2320800300041 94. 2.87 0.18 2320800300042 95. 3.87 0.23 2320800300043 96. 3.54 0.2 2320800300044 97. 3.99 0.25 2320800300045 98. 4.36 0.27 2320800300046 99. 5.22 0.34 2320800300047 101. 5.63 0.33 2320800300048 102. 6.43 0.39 2320800300049 103. 6.87 0.42 2320800300050 104. 6.75 0.39 2320800300051 105. 6.5 0.3 2320800300052 106. 5.83 0.34 2320800300053 107. 5.3 0.33 2320800300054 108. 4.43 0.26 2320800300055 109. 3.48 0.22 2320800300056 110. 1.99 0.12 2320800300057 129. 1.23 0.08 2320800300058 130. 2.43 0.15 2320800300059 131. 3.46 0.21 2320800300060 132. 4.51 0.26 2320800300061 133. 6.49 0.4 2320800300062 134. 6.99 0.4 2320800300063 135. 7.2 0.42 2320800300064 136. 6.83 0.44 2320800300065 137. 6.05 0.37 2320800300066 138. 5.48 0.32 2320800300067 139. 5.5 0.32 2320800300068 140. 4.8 0.69 2320800300069 141. 5.14 0.32 2320800300070 142. 4.03 0.54 2320800300071 143. 4.00 0.26 2320800300072 144. 3.79 0.22 2320800300073 145. 3.55 0.21 2320800300074 146. 2.54 0.16 2320800300075 147. 2.71 0.17 2320800300076 148. 1.91 0.13 2320800300077 149. 1.69 0.29 2320800300078 ENDDATA 42 0 2320800300079 ENDSUBENT 78 0 2320800399999 ENDENTRY 3 0 2320899999999