ENTRY 22767 20060731 21782276700000001 SUBENT 22767001 20060731 21782276700100001 BIB 17 84 2276700100002 TITLE .Measurement of neutron capture cross sections and 2276700100003 capture gamma-ray spectra of Dy-161,162,163,164 at 2276700100004 550 keV. 2276700100005 AUTHOR (H.Kim, J.K.Ahn, G.Kim, T.-I.Ro, W.-C.Chung, 2276700100006 M.Igashira, T.Ohsaki, S.Mizuno) 2276700100007 INSTITUTE (2JPNTIT) M.Igashira, T.Ohsaki, S.Mizuno, and 2276700100008 experimental site 2276700100009 (3KORPNU) H.Kim, J.K.Ahn 2276700100010 (3KORKNU) G.Kim 2276700100011 (3KORDAU) T.-I.Ro, W.-C.Chung 2276700100012 REFERENCE (J,KPS,45,1474,2004) Main reference, data are given 2276700100013 (J,NST,36,493,1999) Experimental and data analysis 2276700100014 details. 2276700100015 FACILITY (VDGT,2JPNTIT) The 3.2-MV PELLETRON accelerator of the 2276700100016 Research Laboratory for Nuclear Reactors at the Tokyo 2276700100017 Institute of Technology. 2276700100018 METHOD (TOF) 2276700100019 (GSPEC) 2276700100020 (PHD) A pulse-height weighting technique was applied to2276700100021 observed capture gamma-ray pulse-height spectra to 2276700100022 derive the capture yields. 2276700100023 INC-SOURCE (P-LI7) Lithium target bombarded by 1.5 ns bunched 2276700100024 proton beam. The lithium target was made by 2276700100025 evaporating metallic lithium on a copper disk with a 2276700100026 diameter of 30 mm and a thickness of 0.4 mm. The 2276700100027 diameter of the Li-layer was about 20 mm. 2276700100028 INC-SPECT .The proton energy was set to 2.4 MeV to generate 2276700100029 neutrons with an average energy of 550-KeV. 2276700100030 *EN-rsl-FW* - energy resolution, full width at half- 2276700100031 maximum 2276700100032 SAMPLE .A standard gold sample, purity 99.999%, weight 2276700100033 6014.3 mg, thickness 0.983 mm, diameter 20.10 mm 2276700100034 DETECTOR (NAICR) Anti-compton NaI(Tl) spectrometer located at 2276700100035 86 cm from the sample and at an angle 125-degrees with2276700100036 respect to the proton-beam direction. The main 2276700100037 detector of the spectrometer was a 15.2 cm diameter 2276700100038 and 20.3 cm long NaI(Tl) detector was centered in a 2276700100039 large hollow compton-suppression detector 33.0 cm 2276700100040 diam and 35.6 cm long - for gamma detection. Energy 2276700100041 resolution of the main detector is 7.6% at 0.662 MeV 2276700100042 and time resolution is 4.0 ns for 0.511 MeV 2276700100043 annihilation gamma-rays. 2276700100044 (GLASD) Li-6 glass scintillation detector for neutron 2276700100045 energy monitoring with diameter 102.0 mm and 2276700100046 thickness of 6.4 mm located at 4.6 m from the neutron2276700100047 source and at 1.9 degrees with respect to the proton 2276700100048 beam direction. 2276700100049 As a neutron flux monitor was used a small Li-6 2276700100050 glass scintillator with a 5 mm diameter and a thick- 2276700100051 ness 5 mm and was placed at 40-degrees with respect 2276700100052 to proton beam direction and 0.48-m from the neutron 2276700100053 target. 2276700100054 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2276700100055 ADD-RES (G-SPC) The capture gamma-ray spectra were obtained and2276700100056 shown on figure 2276700100057 COMMENT *By authors*.Runs with and without the sample (sample 2276700100058 ran and blank run) and a run with a standard gold 2276700100059 sample (gold run) were made cyclically in each 2276700100060 measurement to average changes in experimental 2276700100061 conditions, such as the incident neutron spectrum. 2276700100062 Since the measurements were carried out cyclically, 2276700100063 systematic changes in experimental conditions could be 2276700100064 corrected for. 2276700100065 CORRECTION .Corrections were made for neutron self-shielding and 2276700100066 multiple scattering in the sample, for gamma-ray 2276700100067 absorption and scatteing in sample, from the 2276700100068 dependence of the gamma-ray detection efficiency on the2276700100069 gamma-ray source position, from the impurities in the 2276700100070 sample ad from the dead time. The overall correction 2276700100071 factors obtained were about 0.99 for Gd-155 and Gd-157 2276700100072 and 1.04 for Au-197. 2276700100073 ERR-ANALYS (ERR-T) The neutron capture cross section of Dy- 2276700100074 isotopes were derived with the error of about 2276700100075 6-12% in the neutron energy at 550-KeV. 2276700100076 (MONIT-ERR) Error of the standard cross-section 2276700100077 (ERR-S) Max statistical error. Min error = 3% 2276700100078 (ERR-1) Error in the weighting function of the gamma- 2276700100079 ray spectrometer 2276700100080 (ERR-2) Error of extrapolation of the net capture 2276700100081 gamma-rays below discrimination level is 3%. 2276700100082 (ERR-3) Max error due to corrections. Min error = 1% 2276700100083 STATUS .Table 3 in main reference 2276700100084 HISTORY (20060703C) SM 2276700100085 (20060731U) Last corrections have been done. 2276700100086 ENDBIB 84 0 2276700100087 COMMON 6 3 2276700100088 MONIT-ERR ERR-T ERR-S ERR-1 ERR-2 ERR-3 2276700100089 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2276700100090 3. 12. 10. 1. 3. 2.2276700100091 ENDCOMMON 3 0 2276700100092 ENDSUBENT 91 0 2276700199999 SUBENT 22767002 20060731 21782276700200001 BIB 3 10 2276700200002 REACTION (66-DY-161(N,G)66-DY-162,,SIG,,AV) 2276700200003 SAMPLE .Dy-161, thickness 0.2 mm, weight 0.5362 g, diameter 2276700200004 20 mm, isotopic composition Dy-161 95.66%, 2276700200005 Dy-156 0.02%, Dy-158 0.02%, Dy-160-0.35%, 2276700200006 Dy-162 2.53%, Dy-163 0.90% and Dy-164 0.56%. 2276700200007 CORRECTION .Corrections factor for Dy-161 self-shielding of 2276700200008 neutrons is 0.998 2276700200009 multiple scattering neutrons is 1.010 2276700200010 the overall correction factors obtained were 1.007 2276700200011 for Dy-161 and 1.055 for Au-197. 2276700200012 ENDBIB 10 0 2276700200013 NOCOMMON 0 0 2276700200014 DATA 4 1 2276700200015 EN EN-RSL-FW DATA DATA-ERR 2276700200016 KEV KEV B B 2276700200017 550. 73. 0.221 0.016 2276700200018 ENDDATA 3 0 2276700200019 ENDSUBENT 18 0 2276700299999 SUBENT 22767003 20060731 21782276700300001 BIB 3 10 2276700300002 REACTION (66-DY-162(N,G)66-DY-163,,SIG) 2276700300003 SAMPLE .Dy-162, thickness 0.2 mm, weight 0.3097 g, diameter 2276700300004 15 mm, isotopic composition Dy-162 96.17%, 2276700300005 Dy-156 less then 0.01%, Dy-158 less then 0.01%, 2276700300006 Dy-160 0.08%, Dy-161 1.24%, Dy-163 1.79%, 2276700300007 Dy-164 0.72% 2276700300008 CORRECTION .Corrections factor for Dy-162 self-shielding of 2276700300009 neutrons is 0.998, for multiple scattering neutrons 2276700300010 is 1.008, the overall correction factors obtained are 2276700300011 1.007 for Dy-162 and 1.049 for Au-197. 2276700300012 ENDBIB 10 0 2276700300013 NOCOMMON 0 0 2276700300014 DATA 4 1 2276700300015 EN EN-RSL-FW DATA DATA-ERR 2276700300016 KEV KEV B B 2276700300017 550. 180. 0.11 0.007 2276700300018 ENDDATA 3 0 2276700300019 ENDSUBENT 18 0 2276700399999 SUBENT 22767004 20060731 21782276700400001 BIB 3 10 2276700400002 REACTION (66-DY-163(N,G)66-DY-164,,SIG) 2276700400003 SAMPLE .Dy-163, thickness 0.205 mm, weight 0.5555 g, diameter 2276700400004 20.05 mm, isotopic composition Dy-163 98.86%, 2276700400005 Dy-156 less then 0.01%, Dy-158 less then 0.01%, 2276700400006 Dy-160 0.03%, Dy-161 0.36%, Dy-162 1.23%, 2276700400007 Dy-164 1.52%. 2276700400008 CORRECTION .Corrections factor for Dy-163 self-shielding of 2276700400009 neutrons is 0.998, for multiple scattering of neutrons2276700400010 is 1.010, the overall correction factors obtained 2276700400011 were 1.007 for Dy-163 and 1.054 for Au-197. 2276700400012 ENDBIB 10 0 2276700400013 NOCOMMON 0 0 2276700400014 DATA 4 1 2276700400015 EN EN-RSL-FW DATA DATA-ERR 2276700400016 KEV KEV B B 2276700400017 550. 83. 0.119 0.008 2276700400018 ENDDATA 3 0 2276700400019 ENDSUBENT 18 0 2276700499999 SUBENT 22767005 20060731 21782276700500001 BIB 3 11 2276700500002 REACTION (66-DY-164(N,G)66-DY-165,,SIG) 2276700500003 SAMPLE .Dy-164, thickness 0.2 mm, weight 0.3286 g, diameter 2276700500004 15.5 mm, isotopic composition Dy-164 98.45%, 2276700500005 Dy-156 less then 0.01%, Dy-158 less then 0.02%, 2276700500006 Dy-160 0.02%, Dy-161 0.15%, Dy-162 0.35%, 2276700500007 Dy-163-1.03%. 2276700500008 CORRECTION .Corrections factor for Dy-164- self-shielding of 2276700500009 neutrons is 0.998 2276700500010 multiple scattering neutrons is-1.011 2276700500011 the overall correction factors obtained were 1.008 2276700500012 for Dy-164 and 1.048 for Au-197. 2276700500013 ENDBIB 11 0 2276700500014 NOCOMMON 0 0 2276700500015 DATA 4 1 2276700500016 EN EN-RSL-FW DATA DATA-ERR 2276700500017 KEV KEV B B 2276700500018 550. 173. 0.037 0.005 2276700500019 ENDDATA 3 0 2276700500020 ENDSUBENT 19 0 2276700599999 ENDENTRY 5 0 2276799999999