ENTRY 23756 20221007 2375600000001 SUBENT 23756001 20221007 20230412 2375600100001 BIB 12 79 2375600100002 TITLE Measurement of the 232Th(n,f) cross section with 2375600100003 quasi-monoenergetic neutron beams in the energy range 2375600100004 2-18 MeV 2375600100005 AUTHOR (V.Michalopoulou, M.Axiotis, S.Chasapoglou, Z.Eleme, 2375600100006 G.Gkatis, A.Kalamara, M.Kokkoris, A.Lagoyannis, 2375600100007 N.Patronis, A.Stamatopoulos, A.Tsantiri, R.Vlastou) 2375600100008 INSTITUTE (2GRCTUA,2ZZZCER,2GRCATH,2GRCIOA) 2375600100009 REFERENCE (J,EPJ/A,57,277,2021) 2375600100010 FACILITY (VDGT,2GRCATH) 5.5 MV Van de Graaff Tandem 2375600100011 INC-SOURCE (P-T) En=2.0-5.3 MeV. Protons (3.4-6.5 MeV) on TiT in 2375600100012 between Mo foils (10 um) and Cu plate (1 mm) as beam 2375600100013 stop 2375600100014 (D-D) En=9.9 MeV. Deuterons (7.0 MeV) impinging on a 2375600100015 deuterium gas cell 2375600100016 (D-T) En=14.8-17.8 MeV. Deuterons (1.8-2.8 MeV) on TiT 2375600100017 in between Mo foils (10 um) and Cu plate (1 mm) as 2375600100018 beam stop 2375600100019 SAMPLE 232Th (side:1): 2375600100020 8.0 cm diam., 5.0 cm Al sample mask, 5.60+/-0.02 mg, 2375600100021 (7.401+/-0.02)E+17 nuclei/cm2 (impurity: nuclides on 2375600100022 the 232Th decay chain) 2375600100023 232Th (side:3): 2375600100024 8.0 cm diam., 4.0 cm Al sample mask, 3.47+/-0.01 mg, 2375600100025 (7.17+/-0.03)E+17 nuclei/cm2 (impurity: nuclides on 2375600100026 the 232Th decay chain) 2375600100027 238U (label:209): 2375600100028 5.2 cm diam., 5.0 cm Al sample mask, 8.92+/-0.05 mg, 2375600100029 (11.5+/-0.07)E+17 nuclei/cm2 2375600100030 238U (label:210): 2375600100031 5.2 cm diam., 5.0 cm Al sample mask, 8.19+/-0.05 mg, 2375600100032 (10.6+/-0.06)E+17 nuclei/cm2 2375600100033 235U: 2375600100034 5.2 cm diam., 5.2 cm Al sample mask, 4.98+/-0.03 mg, 2375600100035 (6.01+/-0.03)E+17 nuclei/cm2 (impurity:234U) 2375600100036 237Np (not used in data analysis): 2375600100037 8.0 cm diam., 4.0 cm Al sample mask, 1.24+/-0.02 mg, 2375600100038 (1.57+/-0.23)E+17 nuclei/cm2 (impurity:241Am) 2375600100039 The samples were characterized via alpha-spectrometry. 2375600100040 DETECTOR (IOCH) Micro-Bulk Micromegas detectors 2375600100041 CORRECTION Corrected for 2375600100042 - difference in neutron flux in the Th and U samples 2375600100043 estimated by MCNP6 (mainly geometric correction) 2375600100044 - parasitic neutrons due to presence of experimental 2375600100045 setup materials and scattering in the experimental 2375600100046 area 2375600100047 - parasitic neutrons due to presence of beam line 2375600100048 and target container materials 2375600100049 - parasitic neutrons due to interaction of p or d 2375600100050 beams with materials (e.g., Ti) 2375600100051 - amplitude cut due to loss of fission fragments 2375600100052 - dead time (negligible, less than 0.3%) 2375600100053 ERR-ANALYS Partial uncertainties received from V.Michalopoulou: 2375600100054 ----------------------------------------------------- 2375600100055 En(MeV) ERR-1(%) ERR-2(%) ERR-3(%) ERR-4(%) 2375600100056 ----------------------------------------------------- 2375600100057 2.0 <0.1 <1 Neg. Neg. 2375600100058 2.5 <0.1 <1 Neg. Neg. 2375600100059 3.0 <0.4 <1 Neg. Neg. 2375600100060 3.5 <0.3 <1 Neg. Neg. 2375600100061 4.0 <0.3 <1 Neg. Neg. 2375600100062 4.3 <0.3 <1 Neg. Neg. 2375600100063 4.7 <0.2 <1 Neg. Neg. 2375600100064 5.3 <0.3 <1 Neg. Neg. 2375600100065 9.9 <2 <1 Neg. 1 2375600100066 14.8 <0.4 <1 Neg. Neg. 2375600100067 16.5 <1.5 <1 Neg. Neg. 2375600100068 17.8 <1.8 <1 Neg. Neg. 2375600100069 ----------------------------------------------------- 2375600100070 Neg.=Negligible 2375600100071 ----------------------------------------------------- 2375600100072 (ERR-1,,2.) Parasitic neutrons (<2%) 2375600100073 (ERR-2,,1.) Amplitude cut (<1%) 2375600100074 (ERR-3,,0.1) Dead time (<0.1%) 2375600100075 (ERR-4) Neutron fluence ratio (<1%) 2375600100076 (ERR-5) Sample mass (3%) 2375600100077 STATUS (TABLE) Table 4 of Eur.Phys.J.A57(2021)277 2375600100078 (APRVD)Proof-read by Veatriki Michalopoulou(2021-12-08)2375600100079 HISTORY (20211125C) On 2375600100080 (20221007A) On. Major revisions in 002 and 003. 2375600100081 ENDBIB 79 0 2375600100082 COMMON 1 3 2375600100083 ERR-5 2375600100084 PER-CENT 2375600100085 3. 2375600100086 ENDCOMMON 3 0 2375600100087 ENDSUBENT 86 0 2375600199999 SUBENT 23756002 20221007 20230412 2375600200001 BIB 7 19 2375600200002 REACTION 1((90-TH-232(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2375600200003 2((90-TH-232(N,F),,SIG)/(92-U-238(N,F),,SIG)) 2375600200004 3(90-TH-232(N,F),,SIG) 2375600200005 MONITOR 3((MONIT1)92-U-235(N,F),,SIG) 2375600200006 ((MONIT2)92-U-238(N,F),,SIG) 2375600200007 METHOD Irradiation of two different 232Th samples with 235U 2375600200008 and 238U samples 2375600200009 ANALYSIS 3Average of cross sections normalized with 235U(n,f) 2375600200010 and 238U(n,f) with the difference between them being 2375600200011 less than 1% at both energies. 2375600200012 ERR-ANALYS1(ERR-6,,,U) 232Th(n,f) counting statistics 2375600200013 (ERR-7,,,U) 235U(n,f) counting statistics 2375600200014 2(ERR-6,,,U) 232Th(n,f) counting statistics 2375600200015 (ERR-7,,,U) 238U(n,f) counting statistics 2375600200016 3(ERR-S) Statistical uncertainty 2375600200017 (MONIT1-ERR) 235U(n,f) cross section 2375600200018 (MONIT2-ERR) 238U(n,f) cross section 2375600200019 STATUS (COREL,23756003) Cross sections at 3.0 MeV and above 2375600200020 HISTORY (20221007A) On. ERR-6/7 values received from V.M. added2375600200021 ENDBIB 19 0 2375600200022 NOCOMMON 0 0 2375600200023 DATA 15 2 2375600200024 EN EN-RSL-HW DATA 1ERR-6 1ERR-7 1DATA 22375600200025 ERR-6 2ERR-7 2DATA 3ERR-S 3ERR-4 MONIT1 32375600200026 MONIT1-ERR3MONIT2 3MONIT2-ERR3 2375600200027 MEV MEV NO-DIM PER-CENT PER-CENT NO-DIM 2375600200028 PER-CENT PER-CENT B PER-CENT PER-CENT B 2375600200029 PER-CENT PER-CENT PER-CENT 2375600200030 2.0 0.1 0.0908 3.4 1.1 0.218 2375600200031 3.2 1.2 0.117 4.3 0. 1.289 2375600200032 1.3 0.538 1.3 2375600200033 2.5 0.1 0.0887 3.0 1.0 0.205 2375600200034 2.9 1.1 0.112 2.7 0. 1.261 2375600200035 1.3 0.545 1.3 2375600200036 ENDDATA 12 0 2375600200037 ENDSUBENT 36 0 2375600299999 SUBENT 23756003 20221007 20230412 2375600300001 BIB 5 7 2375600300002 REACTION 1((90-TH-232(N,F),,SIG)/(92-U-238(N,F),,SIG)) 2375600300003 2(90-TH-232(N,F),,SIG) 2375600300004 MONITOR 2(92-U-238(N,F),,SIG) 2375600300005 ERR-ANALYS (ERR-S) Statistical uncertainty 2375600300006 2(MONIT-ERR) 238U(n,f) cross section 2375600300007 STATUS (COREL,23756002) Cross sections at 2.0 and 2.5 MeV 2375600300008 HISTORY (20221007A) On. ERR-ANALYS(ERR-S) moved from 001. 2375600300009 ENDBIB 7 0 2375600300010 NOCOMMON 0 0 2375600300011 DATA 8 10 2375600300012 EN EN-RSL-HW DATA 1DATA 2ERR-S ERR-4 2375600300013 MONIT 2MONIT-ERR 2 2375600300014 MEV MEV NO-DIM B PER-CENT PER-CENT 2375600300015 B PER-CENT 2375600300016 3.0 0.1 0.256 0.135 3.0 0. 2375600300017 0.526 1.3 2375600300018 3.5 0.1 0.252 0.137 2.9 0. 2375600300019 0.545 1.3 2375600300020 4.0 0.1 0.254 0.142 2.8 0. 2375600300021 0.557 1.3 2375600300022 4.3 0.1 0.244 0.137 2.9 0. 2375600300023 0.561 1.4 2375600300024 4.7 0.1 0.262 0.147 2.7 0. 2375600300025 0.561 1.4 2375600300026 5.3 0.1 0.245 0.135 3.0 0. 2375600300027 0.550 1.4 2375600300028 9.9 0.1 0.301 0.304 1.6 1. 2375600300029 1.011 1.5 2375600300030 14.8 0.5 0.313 0.383 6.0 0. 2375600300031 1.221 1.4 2375600300032 16.5 0.5 0.346 0.456 3.9 0. 2375600300033 1.318 1.5 2375600300034 17.8 0.3 0.378 0.50 8.0 0. 2375600300035 1.320 1.5 2375600300036 ENDDATA 24 0 2375600300037 ENDSUBENT 36 0 2375600399999 ENDENTRY 3 0 2375699999999