ENTRY 23188 20130301 22352318800000001 SUBENT 23188001 20130301 22352318800100001 BIB 12 48 2318800100002 TITLE A facility for fast-neutron irradiations at Jyvaeskylae2318800100003 and its use for nuclide cross-section measurements in 2318800100004 fission 2318800100005 AUTHOR (G.Lhersonneau, T.Malkiewicz, P.Jones, P.Karvonen, 2318800100006 S.Ketelhut,O.Bajeat,M.Fadil,S.Gaudu, M.G.Saint-Laurent,2318800100007 W.H.Trzaska) 2318800100008 INSTITUTE (2SF JYV) P.Jones, P.Karvonen,S.Ketelhut,W.H.Trzaska. 2318800100009 (2FR GAN) G.Lhersonneau, O.Bajeat,M.Fadil,S.Gaudu, 2318800100010 M.G.Saint-Laurent. 2318800100011 (2FR GRE) T.Malkiewicz. 2318800100012 REFERENCE (J,NIM/A,698,224,2013) 2318800100013 FACILITY (CYCLO,2SF JYV) K-130 cyclotron at Department of 2318800100014 Physics, Jyvaeskylae, Finland. 2318800100015 Transport system was used to move the target from the 2318800100016 irradiation to measurement position. 2318800100017 INC-SOURCE (D-C12) Neutrons produced via d+C-12 reaction. 2318800100018 40 MeV deuterons.Carbon powder. 2318800100019 INC-SPECT Broad neutron spectrum at 11 deg angle is presented 2318800100020 on Fig.1 of J,NIM/A698,224,2013. 2318800100021 The neutron conversion factor for the target in the 2318800100022 geometry of the experiment was taken as 2318800100023 (0.21+-0.003)*10**-2 neutron per deuteron (n/d). 2318800100024 Thermal neutrons contribution measured by 2318800100025 In-115(n,g)In-116 reaction was 1.6E-7 n/d (1.0*10**-7 2318800100026 fraction of the fast neutron flux)- low enough 2318800100027 with respect to the fast-neutron flux to state that 2318800100028 fissions induced on 235U represented a negligible 2318800100029 contribution to the total. 2318800100030 Average energy of neutron spectrum 12.7 MeV. 2318800100031 SAMPLE Uranium targets are metal disks of 12mm diameter, 0.5mm2318800100032 thick. Placed at 34 +-2 mm from entrance window of 2318800100033 carbon target. 2318800100034 DETECTOR (GE) Two Clover detectors complete with their 2318800100035 Compton-suppression shields were placed at 12cm from 2318800100036 the geometric center of the uranium target. 2318800100037 The detectors have an average resolution (FWHM) at 2318800100038 1.332MeV of 2.3-2.7 keV per detector crystal and the 2318800100039 peak-to-total ratio after add-back is 43%. 2318800100040 METHOD (GSPEC) 2318800100041 (ACTIV) 1.3*10**4 cycles consisting of 5s irradiation, 2318800100042 1.2s target transport, 25s counting and another 2318800100043 transport.Six identical targets were placed on the 2318800100044 transport chain . 2318800100045 Neutron spectrum was measured by activation of 2318800100046 Al,Ni,In,Bi foils. 2318800100047 CORRECTION For finite dimensions of U target. 2318800100048 Due to U disk volume and self-absorption. 2318800100049 HISTORY (20130201C) M.M. 2318800100050 ENDBIB 48 0 2318800100051 NOCOMMON 0 0 2318800100052 ENDSUBENT 51 0 2318800199999 SUBENT 23188002 20130301 22352318800200001 BIB 4 22 2318800200002 REACTION (92-U-238(N,F)50-SN-132,,SIG,,SPA) 2318800200003 Independent c-s for Sn-132 production. 2318800200004 REL-REF (D,22723001,G.Lhersonneau+,J,EPJ/A,9,385,2000) 2318800200005 Higher than calculated from experiment at IGISOL 2318800200006 separator - 2.28 mb. 2318800200007 (D,,T.R.England+,R,LA-UR-94-31006,1993) 2318800200008 Somewhat lower than 5.34 mb . 2318800200009 ERR-ANALYS (DATA-ERR) Includes the sole uncertainties due to input2318800200010 decay spectroscopy data and counting statistics. 2318800200011 In addition,the measurement has : 2318800200012 - hard-core error of 15% due to various scaling factors2318800200013 independent of the nucleus measured. The main 2318800200014 contributions are : 2318800200015 (ERR-1) - the neutron flux(14%), 2318800200016 (ERR-2) - the Ge-efficiency(5%). 2318800200017 (ERR-3,,2.)Calibration of the current integrator (<2%) 2318800200018 does not play a part since the cross-section is 2318800200019 directly calculated from the number of neutrons. 2318800200020 (ERR-4,,0.1) Uncertainty of foil weight < 0.1%. 2318800200021 (ERR-T) The final error 19%. 2318800200022 STATUS (TABLE) Table 1 of J,NIM/A698,224,2013 2318800200023 (PRELM) Preliminary data. 2318800200024 ENDBIB 22 0 2318800200025 NOCOMMON 0 0 2318800200026 DATA 4 1 2318800200027 EN-MEAN DATA DATA-ERR ERR-T 2318800200028 MEV MB MB PER-CENT 2318800200029 12.7 4.5 0.5 19. 2318800200030 ENDDATA 3 0 2318800200031 ENDSUBENT 30 0 2318800299999 ENDENTRY 2 0 2318899999999