ENTRY 21768 20210802 23032176800000001 SUBENT 21768001 20210802 23032176800100001 BIB 6 19 2176800100002 TITLE Fast neutron capture on Hf-180 and W-184 2176800100003 and the solar hafnium and tungsten abundance 2176800100004 AUTHOR (H.Beer,F.Kaeppeler,K.Wisshak) 2176800100005 REFERENCE (J,AAA,105,270,198209) Main reference. 2176800100006 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2176800100007 cross sections. 2176800100008 (C,79KNOX,,340,197910) W-184 results. 2176800100009 (P,NEANDC(E)-212,(5),5,198006) Graph for W-184. 2176800100010 INSTITUTE (2GERKFK) 2176800100011 FACILITY (VDG,2GERKFK) The 3 MV pulsed Van de Graaff. 2176800100012 HISTORY (19820413C)BN. 2176800100013 Subent 002/003 taken from EXFOR Entry 21737. 2176800100014 (19830831U) In Subent 004 DECAY-DATA(-MON) corrected. 2176800100015 (20170128U) SD:Updated to new date formats,lower case; 2176800100016 year of ref. was changed (1981 -> 1982). SAMPLE moved 2176800100017 to Subents 002-005. Subents 002 and 003 were merged. 2176800100018 Subent 005 was added. 2176800100019 (20210802A) SD: Correction in Subent 004. 2176800100020 Subent 006 added. 2176800100021 ENDBIB 19 0 2176800100022 NOCOMMON 0 0 2176800100023 ENDSUBENT 22 0 2176800199999 SUBENT 21768002 20170128 22572176800200001 BIB 14 51 2176800200002 REACTION (74-W-184(N,G)74-W-185,,SIG) 2176800200003 INC-SOURCE (P-LI7) The Li-7(p,n)-reaction using a water cooled 2176800200004 target and a proton beam energy 20 keV above the 2176800200005 reaction threshold to obtain a kinematically 2176800200006 collimated neutron beam. 2176800200007 (P-T) The H-3(p,n)-reaction using water cooled 2176800200008 target and a proton beam energy 100 keV above the 2176800200009 reaction threshold to obtain a kinematically 2176800200010 collimated neutron beam. 2176800200011 SAMPLE (74-W-184,ENR=0.943) W enriched in W-184 to 94.3%, 2176800200012 W-180 (0.05%); W-182 (1.91%); W-183 (1.87%), 2176800200013 W-186 (1.91%) with thickness 11.235 x 10**4 atoms/b; 2176800200014 weight - 3.245 gr. 2176800200015 Au-197 ( metal monitor sample) with thickness 2176800200016 28.833 x 10**4 atoms/b; weight - 6.666 gr. 2176800200017 Graphite (this sample served as a pure scatterer) 2176800200018 an empty sample container (background corr.) 2176800200019 METHOD (TOF) Time of flight techniques with prompt gamma 2176800200020 ray detection. 2176800200021 FLAG (1.) RUN I covered the energy range between 5 and 2176800200022 100 keV using the 7Li(p,n)reaction 2176800200023 (2.) RUN II was carried out with the 3H(p,n)-reaction 2176800200024 in the energy range from 50 to 200 keV 2176800200025 REL-REF (M,20767001,K.Wisshak+,J,NSE,69,39,1979) - method 2176800200026 described. 2176800200027 DETECTOR (MOXR) Moxon-Rae detector, consisting of a 2.5 cm 2176800200028 thick graphite converter and a NE111 plastic scin- 2176800200029 tillator. The detector was placed at a 120 degree 2176800200030 backward angle. 2176800200031 (GLASD) A Li-6 glass flux monitor at 20 degrees. 2176800200032 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2176800200033 MONIT-REF (,,3,ENDF/B-IV,,1974) 2176800200034 PART-DET (G) Prompt capture gamma rays. 2176800200035 CORRECTION .For- 2176800200036 -differences in flight paths, 2176800200037 -normalization to the observed neutron flux, 2176800200038 -neutron multiple scattering, 2176800200039 -neutron self-shielding, 2176800200040 -gamma ray absorption in the sample. 2176800200041 ERR-ANALYS (ERR-SYS) Total systematic error. 2176800200042 * uncertainty in gold standard cross section (2.5%), 2176800200043 * correction for isotopic impurities (0.6 %), 2176800200044 * normalization of the TOF-spectra to the same 2176800200045 neutron beam intensity (0.3%), 2176800200046 * flight path (0.5%), 2176800200047 * constant background subtraction and others (2-3%). 2176800200048 (ERR-S) Statistical error 2176800200049 (ERR-T) Total error. 2176800200050 STATUS (TABLE) Tbl. 5 from AAA,105,270,1982 2176800200051 HISTORY (20170128A) SD: ERR-1 -> ERR-SYS. Subent 003 was added.2176800200052 REL-REF, MONIT-REF, FLAG were added. 2176800200053 ENDBIB 51 0 2176800200054 NOCOMMON 0 0 2176800200055 DATA 7 31 2176800200056 EN EN-RSL DATA ERR-S ERR-SYS ERR-T 2176800200057 FLAG 2176800200058 KEV KEV B PER-CENT PER-CENT PER-CENT 2176800200059 NO-DIM 2176800200060 5.17 1.15 0.590 8.62 3.81 9.422176800200061 1. 2176800200062 7.55 1.19 0.550 9.18 3.66 9.882176800200063 1. 2176800200064 10.05 1.30 0.373 7.04 3.58 7.902176800200065 1. 2176800200066 12.47 1.08 0.352 5.71 3.50 6.702176800200067 1. 2176800200068 14.02 0.61 0.296 10.41 5.28 11.672176800200069 1. 2176800200070 14.92 0.66 0.29 9.00 5.02 10.302176800200071 1. 2176800200072 15.90 0.72 0.279 7.94 4.79 9.282176800200073 1. 2176800200074 16.99 0.78 0.309 7.56 4.25 8.672176800200075 1. 2176800200076 18.20 0.85 0.285 7.03 4.17 8.172176800200077 1. 2176800200078 19.53 0.94 0.317 6.32 3.96 7.462176800200079 1. 2176800200080 21.02 1.03 0.305 5.55 3.84 6.752176800200081 1. 2176800200082 22.69 1.14 0.300 4.38 3.75 5.762176800200083 1. 2176800200084 24.57 1.27 0.261 3.82 3.69 5.312176800200085 1. 2176800200086 26.68 1.42 0.2567 3.53 3.62 5.052176800200087 1. 2176800200088 29.08 1.59 0.2453 2.99 3.57 4.652176800200089 1. 2176800200090 31.83 1.80 0.2390 2.63 3.54 4.412176800200091 1. 2176800200092 34.97 2.04 0.2413 2.63 3.52 4.392176800200093 1. 2176800200094 38.61 2.34 0.1960 2.42 3.52 4.272176800200095 1. 2176800200096 42.85 2.70 0.2228 2.13 3.49 4.092176800200097 1. 2176800200098 47.83 3.15 0.2154 1.84 3.48 3.942176800200099 1. 2176800200100 53.73 3.71 0.2162 1.68 3.47 3.862176800200101 1. 2176800200102 60.79 4.42 0.2016 1.56 3.47 3.802176800200103 1. 2176800200104 65.39 5.37 0.2023 4.43 6.57 7.932176800200105 2. 2176800200106 69.35 5.32 0.1892 1.46 3.46 3.762176800200107 1. 2176800200108 76.67 6.76 0.1889 3.56 5.40 6.472176800200109 2. 2176800200110 79.84 6.51 0.1769 1.60 3.47 3.822176800200111 1. 2176800200112 91.14 8.68 0.1794 2.94 4.63 5.482176800200113 2. 2176800200114 92.91 8.10 0.1685 2.96 3.54 4.622176800200115 1. 2176800200116 110.14 11.44 0.1518 2.71 4.38 5.152176800200117 2. 2176800200118 135.75 15.54 0.1120 2.83 4.44 5.272176800200119 2. 2176800200120 171.46 21.91 0.0988 3.86 5.72 6.902176800200121 2. 2176800200122 ENDDATA 66 0 2176800200123 ENDSUBENT 122 0 2176800299999 NOSUBENT 21768003 20170129 22572176800300001 SUBENT 21768004 20210802 23032176800400001 BIB 15 40 2176800400002 REACTION (72-HF-180(N,G)72-HF-181,,SIG,,SPA) 2176800400003 SAMPLE Natural metal foil with thickness 2.05 x 10**4 atoms/b2176800400004 Au-197 (monitor metal sample with thickness 2176800400005 2.00 x 10**4 atoms/b) 2176800400006 graphite (this sample served as a pure scatterer) 2176800400007 an empty sample container (background corr.) 2176800400008 INC-SOURCE (P-LI7) The Li-7(p,n) reaction using proton energies 2176800400009 25 keV above the reaction threshold to obtain a 2176800400010 kinematically collimated neutron beam. 2176800400011 INC-SPECT The neutron spectrum is similar to a Maxwellian 2176800400012 distribution at 25 keV thermal energy. 2176800400013 METHOD (ACTIV,MOSEP,EXTB) A natural Hf-foil in back-to-back 2176800400014 geometry with a gold foil was exposed for about 2176800400015 20 h to the neutron beam. 2176800400016 DETECTOR (GELI) Ge (Li)-detector (42 cm3, 2 keV energy 2176800400017 resolution at 1.33 MeV). 2176800400018 DECAY-DATA (72-HF-181,42.4D,DG,482.,0.81) 2176800400019 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2176800400020 The Maxwellian average Au cross section was 2176800400021 calculated from ENDF/B-IV. 2176800400022 MONIT-REF (,,3,ENDF/B-IV,,1974) 2176800400023 DECAY-MON (79-AU-198-G,2.69D,DG,412.,0.9552) 2176800400024 REL-REF (M,,H.Beer+,J,PR/C,21,534,1980) - method details. 2176800400025 COMMENT The authors calculated a cross section at 30 keV by 2176800400026 extrapolating the measured Hf cross section using a 2176800400027 statistical model calculation of Drake et al. 2176800400028 The quoted value is ( 180 +- 9 )mb. 2176800400029 ERR-ANALYS (ERR-T) Total error. 2176800400030 The total error is composed as follows: 2176800400031 (MONIT-ERR) Uncertainty in Au standard, 2176800400032 (ERR-1) Uncertainty in decay scheme(2.5%), 2176800400033 (ERR-2) Uncertainty in detector efficiency, 2176800400034 (ERR-3) Uncertainty in diverg. of neutron beam, 2176800400035 (ERR-4) Other uncertainties 2176800400036 (ERR-S) Statistical error 2176800400037 STATUS (TABLE) Tbl. 3 from Astronom.Astroph.,105(1982)270 2176800400038 (SPSDD,21768006) Renormalized. 2176800400039 HISTORY (19830831U) DECAY-DATA, DECAY-MON corrected 2176800400040 (20170128U) SD: ERR-ANALYS update. REL-REF added. 2176800400041 (20210802A) SD: Superseded. KT -> KT-DUMMY. 2176800400042 ENDBIB 40 0 2176800400043 COMMON 5 3 2176800400044 ERR-1 ERR-2 ERR-3 ERR-4 ERR-S 2176800400045 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2176800400046 2.5 1.5 1. 3. 1. 2176800400047 ENDCOMMON 3 0 2176800400048 DATA 5 1 2176800400049 KT-DUMMY DATA ERR-T MONIT MONIT-ERR 2176800400050 KEV MB MB MB MB 2176800400051 25. 193. 10. 672.4 16.8 2176800400052 ENDDATA 3 0 2176800400053 ENDSUBENT 52 0 2176800499999 SUBENT 21768005 20170128 22572176800500001 BIB 4 9 2176800500002 REACTION (74-W-180(N,G)74-W-181,,SIG,,MXW,DERIV) 2176800500003 The microscopic cross sections given in Subent 002 2176800500004 were used to calculate Maxwellian averaged cross 2176800500005 sections at various thermal energies kT according to 2176800500006 formula given on p.274 in the AAA,105,270,1982 2176800500007 ERR-ANALYS (DATA-ERR) Uncertainty derived from ERR-T(see 21768002)2176800500008 STATUS (TABLE) Tbl. 6 from AAA,105,270,1982 2176800500009 (DEP,21768002) 2176800500010 HISTORY (20170128C) SD 2176800500011 ENDBIB 9 0 2176800500012 COMMON 1 3 2176800500013 DATA-ERR 2176800500014 PER-CENT 2176800500015 4. 2176800500016 ENDCOMMON 3 0 2176800500017 DATA 2 10 2176800500018 KT DATA 2176800500019 KEV MB 2176800500020 10. 396. 2176800500021 20. 301. 2176800500022 30. 256. 2176800500023 40. 226. 2176800500024 50. 205. 2176800500025 60. 190. 2176800500026 70. 179. 2176800500027 80. 171. 2176800500028 90. 164. 2176800500029 100. 159. 2176800500030 ENDDATA 12 0 2176800500031 ENDSUBENT 30 0 2176800599999 SUBENT 21768006 20210802 23032176800600001 BIB 14 37 2176800600002 REACTION (72-HF-180(N,G)72-HF-181,,SIG,,SPA) 2176800600003 ANALYSIS Cross section value in subentry 21768.004 2176800600004 renormalized: 2176800600005 a) for new gold cross section 2176800600006 b) by an additional factor 81/80.5 = 1.006, which 2176800600007 accounts for the revised gamma-intensity for the 2176800600008 482.18 keV transition in the 2176800600009 181Hf-decay (NDS/ENSDF 2020) 2176800600010 SAMPLE Natural metal foil with thickness 2.05 x 10**4 atoms/b2176800600011 Au-197 (monitor metal sample with thickness 2176800600012 2.00 x 10**4 atoms/b) 2176800600013 graphite (this sample served as a pure scatterer) 2176800600014 an empty sample container (background corr.) 2176800600015 INC-SOURCE (P-LI7) The Li-7(p,n) reaction using proton energies 2176800600016 25 keV above the reaction threshold to obtain a 2176800600017 kinematically collimated neutron beam. 2176800600018 INC-SPECT The neutron spectrum is similar to a Maxwellian 2176800600019 distribution at 25 keV thermal energy. 2176800600020 METHOD (ACTIV,MOSEP,EXTB) A natural Hf-foil in back-to-back 2176800600021 geometry with a gold foil was exposed for about 2176800600022 20 h to the neutron beam. 2176800600023 DETECTOR (GELI) Ge (Li)-detector (42 cm3, 2 keV energy 2176800600024 resolution at 1.33 MeV). 2176800600025 DECAY-DATA (72-HF-181,42.4D,DG,482.,0.805) 2176800600026 MONITOR (79-AU-197(N,G)79-AU-198-G,,SIG,,MXW) 2176800600027 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2176800600028 DECAY-MON (79-AU-198-G,2.69D,DG,412.,0.9552) 2176800600029 ERR-ANALYS (ERR-T) Total error. 2176800600030 The total error is composed as follows: 2176800600031 (MONIT-ERR) Uncertainty in Au standard, 2176800600032 (ERR-1) Uncertainty in decay scheme, 2176800600033 (ERR-2) Uncertainty in detector efficiency, 2176800600034 (ERR-3) Uncertainty in diverg. of neutron beam, 2176800600035 (ERR-4) Other uncertainties 2176800600036 (ERR-S) Statistical error 2176800600037 STATUS (TABLE) Tbl. 3 from p.35 of INDC(GER)-0053 2176800600038 HISTORY (19830831C) SD 2176800600039 ENDBIB 37 0 2176800600040 COMMON 5 3 2176800600041 ERR-1 ERR-2 ERR-3 ERR-4 ERR-S 2176800600042 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2176800600043 0.5 1.5 1. 3. 1. 2176800600044 ENDCOMMON 3 0 2176800600045 DATA 5 1 2176800600046 KT-DUMMY DATA ERR-T MONIT MONIT-ERR 2176800600047 KEV MB MB MB MB 2176800600048 25. 193. 5. 681. 7. 2176800600049 ENDDATA 3 0 2176800600050 ENDSUBENT 49 0 2176800699999 ENDENTRY 6 0 2176899999999