ENTRY 23022 20131213 22382302200000001 SUBENT 23022001 20131213 22382302200100001 BIB 18 90 2302200100002 TITLE Measurement of the thermal neutron capture cross 2302200100003 section and the resonance integral of radioactive 2302200100004 182Hf 2302200100005 AUTHOR (C.Vockenhuber, M.Bichler, A.Wallner, W.Kutschera, 2302200100006 I.Dillmann, F.Kaeppeler) 2302200100007 INSTITUTE (2AUSTHV) Vienna University of Technology, Atomic 2302200100008 Institute of the Austrian Universities, Wien, 2302200100009 Austria. M.Bichler, and experimental site. 2302200100010 (1CANTMF) TRIUMF, 4004 Wesbrook Mall, Vancouver, 2302200100011 British Columbia, Canada. C.Vockenhuber, correspon- 2302200100012 ding author, Email=christof.vockenhuber@triumf.ca 2302200100013 (2AUSVIE) Vienna Environmental Research Accelerator 2302200100014 (VERA), Fakultaet fuer Physik, Universitaet Wien, 2302200100015 Wien. Austria. A.Wallner and W.Kutschera 2302200100016 (2GERKFK) Institut fuer Kernphysik, Forschungszentrum 2302200100017 Karlsruhe, Karlsruhe, Germany. I.Dillmann, 2302200100018 F.Kaeppeler 2302200100019 REFERENCE (J,PR/C,77,044608,2008) Main reference 2302200100020 REL-REF (R,,F.De Corte+,J,RCA,179,93,1994) Westcott convention 2302200100021 FACILITY (REAC,2AUSTHV) TRIGA Mark-II reactor of the Atomic 2302200100022 Institute of the Austrian Universities in Vienna 2302200100023 INC-SOURCE (REAC) TRIGA-MARK II reactor of the Atomic Institute 2302200100024 of the Austrian Universities 2302200100025 INC-SPECT .Maxwell neutron energy spectrum, T = 300 K 2302200100026 METHOD (ACTIV) 2302200100027 (SITA,STTA) Combined single- stack-target irradiations 2302200100028 ANALYSIS .Westcott convention was followed to deduce the thermal2302200100029 (v = 2200 m/s) neutron capture cross section, and 2302200100030 the resonance integral from the irradiation with 2302200100031 reactor neutrons, see REL-REF. 2302200100032 DETECTOR (HPGE) A 222 cm3 coaxial high-purity germanium 2302200100033 detector (Canberra GC4518) with 50% relative photo- 2302200100034 peak efficiency and a resolution of 1.8 keV at 2302200100035 1.33-MeV gamma-ray energy. 2302200100036 DECAY-MON (40-ZR-95,64.032D,DG,724.2,0.4417, 2302200100037 DG,756.7,0.5446) 2302200100038 (40-ZR-97,16.755HR,DG,93.06,0.9306) 2302200100039 MONITOR ((MONIT1)40-ZR-94(N,G)40-ZR-95,,SIG) 2302200100040 ((MONIT2)40-ZR-96(N,G)40-ZR-97,,SIG) 2302200100041 MONIT-REF (,S.Mughabghab,B,NEUT.CS 1A,,1981) Atlas of 2302200100042 Neutron Resonances:Resonance Parameters and 2302200100043 Thermal Cross Sections,Z = 1 -- 100 (Elsevier, 2302200100044 Amsterdam, 2006). 2302200100045 (,F.De Corte+,J,AND,85,47,2003) - Res. integrals were 2302200100046 calculated from RI/CS ratios recommended in this ref. 2302200100047 SAMPLE .Two samples Helmer-2 plus graphite, Hf-1 and Hf-2. 2302200100048 Diameter 8 mm, mass 39.2 and 26.5 milligram, 2302200100049 isotope content: 2302200100050 Hf-1: 772.8 x 10**16 atoms of Hf-180, 2302200100051 1.851 x 10**16 of Hf-182; 2302200100052 Hf-2 414.1 x 10**16 atoms of Hf-180, 2302200100053 0.992 x 10**16 of Hf-182. 2302200100054 ERR-ANALYS (ERR-T) Total error composed of quadratic sum of its 2302200100055 constituents. 2302200100056 The main uncertainty is coming from the determination 2302200100057 of the thermal and epithermal neutron flux, which 2302200100058 mainly depends on the systematic uncertainties in the 2302200100059 reference cross sections of the Zr isotopes. 2302200100060 Source of uncertainty, relative uncert. 2302200100061 (ERR-1) Uncertainty in gamma-ray absorption effects, 2302200100062 k(gamma) 2.0% 2302200100063 (ERR-2) Uncertainty in gamma efficiency, 2.0% 2302200100064 (ERR-3,3.7,53.) Uncertainty in thermal neutron flux, 2302200100065 irradiation without Cd (3.7%)/with Cd (53.%) 2302200100066 (ERR-4,8.3,8.6) Uncertainty in epithermal neutron 2302200100067 flux, irradiation with (8.3%)/without Cd(8.6%) 2302200100068 (ERR-5) Uncertainty in sample atoms, Nx (182Hf) 2302200100069 (ERR-S) The counting statistics (C) are in all cases 2302200100070 around 1% 2302200100071 C(95Zr): irradiation without Cd (0.1%)/with Cd (1.%) 2302200100072 C(97Zr): irradiat. without Cd(0.1-0.5%)/with Cd(0.8%) 2302200100073 C(181Hf):irradiat. without Cd (0.1-0.5%)/with Cd(0.8%)2302200100074 C(183Hf):irradiat. without Cd (0.2-1.1%)/with Cd(1.5%)2302200100075 C(183Ta): 0.6-0.9% 2302200100076 (ERR-6) Error of decay intensity, I(181Hf) 2302200100077 (ERR-7) Error of decay intensity, I(182Hf) 2302200100078 (ERR-8) Error of decay intensity, I(183Ta) 2302200100079 (ERR-9) Error in deduced decay intensities I, 2302200100080 183Hf decay (2.9%) 2302200100081 (ERR-10) Half-life, 183Ta 2302200100082 (MONIT1-ERR) Reference cross section errors, sig0(94Zr)2302200100083 (MONIT2-ERR) Reference cross section errors,sig0(96Zr)2302200100084 Overall uncertainty: 2302200100085 Thermal cross section of 182Hf(n,g) 7.5% 2302200100086 Resonance integral of 182Hf(n,g) 11.% 2302200100087 STATUS (TABLE) From TABLE V of PR/C,77,044608 2302200100088 HISTORY (20080701) SM 2302200100089 (20131213A) SD: INSTITUTE=2AUSIRK -> 2AUSVIE according 2302200100090 to MEMO CP-D/771. MONITOR's and part of ERR-ANALYS 2302200100091 moved to Subents. 2302200100092 ENDBIB 90 0 2302200100093 COMMON 12 6 2302200100094 MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR ERR-1 ERR-2 2302200100095 ERR-5 ERR-6 ERR-7 ERR-8 ERR-9 ERR-10 2302200100096 B B B B PER-CENT PER-CENT 2302200100097 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2302200100098 0.0494 0.0017 0.0229 0.0010 2.0 2.02302200100099 2.5 0.14 0.76 2.56 2.9 1.82302200100100 ENDCOMMON 6 0 2302200100101 ENDSUBENT 100 0 2302200199999 SUBENT 23022002 20131213 22382302200200001 BIB 3 4 2302200200002 REACTION (72-HF-180(N,G)72-HF-181,,SIG) Cross section at 2302200200003 v=2200 m/sec 2302200200004 DECAY-DATA (72-HF-181,42.39D,DG,482.2,0.8050) HL error=0.06d 2302200200005 ANALYSIS .By measuring with the help of 482.2 keV gamma line 2302200200006 ENDBIB 4 0 2302200200007 NOCOMMON 0 0 2302200200008 DATA 3 1 2302200200009 EN DATA ERR-T 2302200200010 MILLI-EV B B 2302200200011 25. 12.51 0.93 2302200200012 ENDDATA 3 0 2302200200013 ENDSUBENT 12 0 2302200299999 SUBENT 23022003 20131213 22382302200300001 BIB 5 7 2302200300002 REACTION (72-HF-180(N,G)72-HF-181,,RI) 2302200300003 DECAY-DATA (72-HF-181,42.39D,DG,482.2,0.8050) HL error=0.06d 2302200300004 ANALYSIS .By measuring with the help of 482.2 keV gamma line 2302200300005 MONITOR ((MONIT3)40-ZR-94(N,G)40-ZR-95,,RI) 2302200300006 ((MONIT4)40-ZR-96(N,G)40-ZR-97,,RI) 2302200300007 ERR-ANALYS (MONIT3-ERR) Reference cross section errors, I0(94Zr) 2302200300008 (MONIT4-ERR) Reference cross section errors, I0(96Zr) 2302200300009 ENDBIB 7 0 2302200300010 COMMON 4 3 2302200300011 MONIT3 MONIT3-ERR MONIT4 MONIT4-ERR 2302200300012 B B B B 2302200300013 0.262 0.010 5.76 0.11 2302200300014 ENDCOMMON 3 0 2302200300015 DATA 3 1 2302200300016 EN-MIN DATA ERR-T 2302200300017 EV B B 2302200300018 0.5 32. 2.8 2302200300019 ENDDATA 3 0 2302200300020 ENDSUBENT 19 0 2302200399999 SUBENT 23022004 20131213 22382302200400001 BIB 4 13 2302200400002 REACTION (72-HF-182(N,G)72-HF-183,,SIG) Cross section at 2302200400003 v=2200 m/sec 2302200400004 DECAY-DATA (72-HF-182-G,8.90E+6YR,DG,156.1,0.070, 2302200400005 DG,270.4,0.790) HL-error=9.E04 yr 2302200400006 (72-HF-183,1.018HR,DG,459.1,0.297, 2302200400007 DG,783.8,0.655) HL-error=0.002hr 2302200400008 (73-TA-183,5.1D,DG,244.3,0.850, 2302200400009 DG,246.1,0.268, 2302200400010 DG,354.1,0.1123) HL-error= 0.1d 2302200400011 ADD-RES (DECAY) More exact decay parameters for Hf-183 2302200400012 were determined in this work 2302200400013 ANALYSIS .By measuring with the help of 459.1, 723.8 keV gamma 2302200400014 lines 2302200400015 ENDBIB 13 0 2302200400016 NOCOMMON 0 0 2302200400017 DATA 3 1 2302200400018 EN DATA ERR-T 2302200400019 MILLI-EV B B 2302200400020 25. 134.3 11.7 2302200400021 ENDDATA 3 0 2302200400022 ENDSUBENT 21 0 2302200499999 SUBENT 23022005 20131213 22382302200500001 BIB 5 14 2302200500002 REACTION (72-HF-182(N,G)72-HF-183,,RI) 2302200500003 DECAY-DATA (72-HF-182-G,8.90E+6YR,DG,156.1,0.070, 2302200500004 DG,270.4,0.790) HL-error=9.E04 yr 2302200500005 (72-HF-183,1.018HR,DG,459.1,0.297, 2302200500006 DG,783.8,0.655) HL-error=0.002hr 2302200500007 (73-TA-183,5.1D,DG,244.3,0.850, 2302200500008 DG,246.1,0.268, 2302200500009 DG,354.1,0.1123) HL-error= 0.1d 2302200500010 ANALYSIS .By measuring with the help of 459.1, 723.8 keV gamma 2302200500011 lines 2302200500012 MONITOR ((MONIT3)40-ZR-94(N,G)40-ZR-95,,RI) 2302200500013 ((MONIT4)40-ZR-96(N,G)40-ZR-97,,RI) 2302200500014 ERR-ANALYS (MONIT3-ERR) Reference cross section errors, I0(94Zr) 2302200500015 (MONIT4-ERR) Reference cross section errors, I0(96Zr) 2302200500016 ENDBIB 14 0 2302200500017 COMMON 4 3 2302200500018 MONIT3 MONIT3-ERR MONIT4 MONIT4-ERR 2302200500019 B B B B 2302200500020 0.262 0.010 5.76 0.11 2302200500021 ENDCOMMON 3 0 2302200500022 DATA 3 1 2302200500023 EN-MIN DATA ERR-T 2302200500024 EV B B 2302200500025 0.5 5850. 660. 2302200500026 ENDDATA 3 0 2302200500027 ENDSUBENT 26 0 2302200599999 ENDENTRY 5 0 2302299999999