ENTRY 10354 20021120 00001035400000001 SUBENT 10354001 20021120 00001035400100001 BIB 12 35 1035400100002 INSTITUTE (1USAINL) 1035400100003 REFERENCE (J,NP/A,211,1,197308) 1035400100004 AUTHOR (R.G.Helmer,C.W.Reich) 1035400100005 TITLE Half-life of 178(m2)Hf and its neutron capture 1035400100006 production 1035400100007 INC-SOURCE (REAC) MTR. 1035400100008 INC-SPECT Thermal reactor spectrum 1035400100009 SAMPLE 2 samples of natural Hf (18.5% 177Hf); 2 samples 1035400100010 enriched to 84% 177Hf. 1035400100011 METHOD (ACTIV) 1035400100012 Six-month irradiation in a flux of 5*10**14 n/cm**2 1035400100013 sec. 1035400100014 ANALYSIS Determined from the decay data of the enriched samples,1035400100015 using an upper limit for the burn-up cross section of 1035400100016 178Hf-m2 of 20 b determined from the two natural Hf 1035400100017 samples. 1035400100018 For each gamma ray spectrum, the intensities of six 1035400100019 gamma rays from 178Hf-m2 were determined relative to 1035400100020 that of the 270-keV line from 182Hf (half life 9E+06 1035400100021 y). Data for each gamma ray analyzed by means of a 1035400100022 weighted, least squares fit of a linear function to 1035400100023 the logarithm of the observed relative intensity. 1035400100024 For the production cross section analysis, data from 1035400100025 all four samples were used. 1035400100026 ERR-ANALYS (DATA-ERR) Data errors due to uncertainties in the 1035400100027 integrated flux at the sample (perhaps as high as 25%)1035400100028 and in the unknown burnup (20%). 1035400100029 Some systematic errors in the half-life data, caused 1035400100030 perhaps, by the long period involved. 1035400100031 STATUS (APRVD) Approved by author 1035400100032 HISTORY (19731213C) 1035400100033 (19770201U) INSTITUTE updated. 1035400100034 (19790115A) INSTITUTE corrected. 1035400100035 (19830422A) Converted to REACTION formalism. 1035400100036 (20011120A) Converted to new date formats, lower case. 1035400100037 ENDBIB 35 0 1035400100038 NOCOMMON 0 0 1035400100039 ENDSUBENT 38 0 1035400199999 SUBENT 10354002 20021120 00001035400200001 BIB 2 2 1035400200002 REACTION (72-HF-177(N,G)72-HF-178-M2,,SIG,,MXW) 1035400200003 DECAY-DATA (72-HF-178-M2,31.YR) 1035400200004 ENDBIB 2 0 1035400200005 NOCOMMON 0 0 1035400200006 DATA 3 1 1035400200007 EN-DUMMY DATA DATA-ERR 1035400200008 EV B B 1035400200009 .0253 2.0 -071.0 -07 1035400200010 ENDDATA 3 0 1035400200011 ENDSUBENT 10 0 1035400299999 ENDENTRY 2 0 1035499999999