ENTRY 23255 20150610 224423255 0 1 SUBENT 23255001 20150610 224423255 1 1 BIB 13 70 23255 1 2 REFERENCE (J,NP/A,936,6,2015) 23255 1 3 #doi:10.1016/j.nuclphysa.2015.01.003 23255 1 4 AUTHOR (N.Dzysiuk, I.Kadenko, V.Gressier, A.J.Koning) 23255 1 5 TITLE Cross section measurement of the 159Tb(n,gamma)Tb160 23255 1 6 nuclear reaction. 23255 1 7 INSTITUTE (2FR FR) V.Gressier . 23255 1 8 Institute for Radiation Protection and Nuclear Safety,23255 1 9 Cadarache, France. 23255 1 10 (4UKRUKR) Int. Nucl. Safety Center of Ukraine, Kyiv. 23255 1 11 N.Dzysiuk, I.Kadenko. 23255 1 12 (2SWDUPP) N.Dzysiuk . 23255 1 13 (2NEDNRG,3ZZZIAE) A.J.Koning . 23255 1 14 REL-REF (I,,V.Lacoste,J,RM,45,1250,2010) 23255 1 15 Details of long counter. 23255 1 16 FACILITY (ACCEL,2FR FR) AMANDE facility (IRSN, Cadarache) based23255 1 17 on HVEE 2 MV Tandetron accelerator system. 23255 1 18 INC-SOURCE (D-D) Thin deuterated target composed of a Ti layer 23255 1 19 saturated by deuterium 825microg/cm2 thick attached to 23255 1 20 a 0.5mm thick silver backing. 23255 1 21 Characteristics of the deuteron beams: 23255 1 22 Neutron energy.MeV 3.7 4.3 5.4 7. 23255 1 23 Deuteron beam current,MicroA 5. 8. 13. 2.5 23255 1 24 Deuteron beam energy,keV 765. 1234. 2174. 327823255 1 25 Mean energy uncertainty,keV 0.8 1. 1.5 2. 23255 1 26 FWHM of peak, % 8.6 4.8 2.5 9.2 23255 1 27 INC-SPECT Mono-energetic neutrons. 23255 1 28 PLC measurements were performed at 5 m and 0deg from 23255 1 29 the target both with and without a shadow cone to 23255 1 30 measure the fluence of the direct neutrons. The neutron23255 1 31 fluence was monitored both by integrating the deuteron 23255 1 32 charge deposited on the target and by means of two De 23255 1 33 Pangher long counters placed at a distance of 6 m from 23255 1 34 the target. 23255 1 35 The fluence at the calibration position was determined 23255 1 36 with an uncertainty of 2% to 3%. 23255 1 37 SAMPLE Metal of natural composition. 23255 1 38 Two terbium samples : 23255 1 39 - 30mm diameter disk, 5mm of thickness, total mass 23255 1 40 28.9g; 23255 1 41 - parallelepiped shape, 5x8x10 mm,total mass of 3.3g 23255 1 42 METHOD (ACTIV) Terbium samples were irradiated under 0deg 23255 1 43 angle with respect to the incoming deuteron beam. 23255 1 44 The sample-to-target distance was varied from 3.3cm to 23255 1 45 20.3cm leading to neutron fluence rates between 23255 1 46 6.E+4 and 3.E+6 /cm2/s . 23255 1 47 Volumetric inhomogeneity (i.e. the maximum variation) 23255 1 48 in the terbium disk sample was of 39%, 44% and 53% in 23255 1 49 fluence and of 54keV, 86keV and 133keV in energy, 23255 1 50 respectively at 3.7MeV, 4.3MeV, and 5.4MeV. 23255 1 51 The irradiations in the 7MeV neutron field were 23255 1 52 performed at three distances: 23255 1 53 Distance to the target,cm 15.3 3.3 10.3 23255 1 54 Volumetric inhomogeneity,% 14. 93. 22. 23255 1 55 Neutron energy error,kev 27. 413. 48. 23255 1 56 Counting times between 15 minutes and 17 hours at 23255 1 57 1.5cm source-detector distance. 23255 1 58 DETECTOR (LONGC) Long counters for reference fluence 23255 1 59 verification. 23255 1 60 (HPGE) HPGe detector GC1212, CANBERRA for gamma-ray 23255 1 61 spectroscopy of samples immediately after irradiation. 23255 1 62 The extra-range germanium detector GX4019, CANBERRA at 23255 1 63 KINR ( Ukraine) after 5 days . 23255 1 64 The energy resolution was found to be 1.9keV for 1332 23255 1 65 keV gamma-rays from 60Co ; 0.8keV for 122keV from 57Co.23255 1 66 The efficiency calibration of the detector was 23255 1 67 performed by 60Co, 137Cs, 152Eu, 241Am sources. 23255 1 68 CORRECTION For self-shielding; self-shielding factor 1.02-1.05. 23255 1 69 For contribution of low-energy scattered neutrons; 23255 1 70 Fractional contribution(FC) 0.30-0.91 . 23255 1 71 HISTORY (20150610C) M.M. 23255 1 72 ENDBIB 70 0 23255 1 73 NOCOMMON 0 0 23255 1 74 ENDSUBENT 73 0 23255 199999 SUBENT 23255002 20150610 224423255 2 1 BIB 7 28 23255 2 2 REACTION (65-TB-159(N,G)65-TB-160,,SIG) 23255 2 3 DECAY-DATA (65-TB-160,72.3D,DG,298.58,0.255,DG,966.17,0.252) 23255 2 4 ANALYSIS The cross sections were calculated by the isotopic 23255 2 5 abundance, the number of nuclei in sample, the decay 23255 2 6 constant, the detector efficiency, the gamma yield, 23255 2 7 the neutron flux, the times of irradiation, cooling, 23255 2 8 measurement, the peak area, the self-shielding factor, 23255 2 9 the fractional contribution of the low-energy scattered23255 2 10 neutrons - see Eq.(2) of J,NP/A,936,6,2015. 23255 2 11 ERR-ANALYS (ERR-T) Total uncertainty combined from individual 23255 2 12 uncertainties in quadrature - 7.1 - 38 % . 23255 2 13 Sources of uncertainties: 23255 2 14 (ERR-S,3.,5.5) Counting rate (3-5.5)% 23255 2 15 (ERR-1) Efficiency calibration 23255 2 16 (ERR-2,0.22,0.78) Self-absorption of gamma-ray 23255 2 17 (ERR-3,,0.1) Constants (mass) <0.1% 23255 2 18 (ERR-4,2.3,6.) Neutron flux (2.3-6)% 23255 2 19 (ERR-5,0.2,0.7) Gamma intensity (0.2-0.7) 23255 2 20 Also self-shielding factor and fractional contribution.23255 2 21 Errors of weighting the sample or monitor one are 23255 2 22 negligible as well (<0.05%). 23255 2 23 REL-REF (R,,R.B.Firestone+,B,FIRESTONE,,1996) 23255 2 24 Ref.for HL of Tb-160 23255 2 25 (A,12832014,W.P.Poenitz,S,ANL-83-4,239,1982) 23255 2 26 (A,30031024,G.Peto+,J,JNE,21,797,1967) 23255 2 27 ADD-RES (COMP) Measured data are compared and agree with 23255 2 28 TALYS-1.2 calculation . 23255 2 29 STATUS (TABLE) Table 3 of J,NP/A,936,6,2015. 23255 2 30 ENDBIB 28 0 23255 2 31 COMMON 1 3 23255 2 32 ERR-1 23255 2 33 PER-CENT 23255 2 34 3. 23255 2 35 ENDCOMMON 3 0 23255 2 36 DATA 4 4 23255 2 37 EN EN-ERR DATA ERR-T 23255 2 38 MEV MEV MB MB 23255 2 39 3.6700 0.0008 30.8 2.2 23255 2 40 4.2800 0.0010 21.78 1.80 23255 2 41 5.3900 0.0015 6.13 0.55 23255 2 42 6.850 0.002 2.14 0.83 23255 2 43 ENDDATA 6 0 23255 2 44 ENDSUBENT 43 0 23255 299999 ENDENTRY 2 0 2325599999999