ENTRY 41666 20190513 41824166600000001 SUBENT 41666001 20190513 41824166600100001 BIB 13 31 4166600100002 REFERENCE (J,PL/B,106,383,1981) 4166600100003 AUTHOR (I.A.Kondurov,E.M.Korotkokh,Yu.V.Petrov,G.I.Shuljak) 4166600100004 TITLE Acceleration of thermal neutrons by isomeric nuclei 4166600100005 (180Hfm) 4166600100006 REL-REF (I,,I.A.Kondurov+,J,JEL,31,232,1980) 4166600100007 (R,,W.Mannhart,J,ZP/A,272,273,1975) 4166600100008 Life time 7.7+-0.05 hr. 4166600100009 INSTITUTE (4RUSLIN) 4166600100010 FACILITY (REAC,4RUSLIN) 4166600100011 INC-SOURCE Boron shutter was used for V=2200 m/sec neutrons. 4166600100012 INC-SPECT Thermal neutron flux was measured by gold foils to be 4166600100013 1.6E+7 /sec/cm2 . 4166600100014 to be (3.3+-0.2)*10**14 /sec/cm2. 4166600100015 DETECTOR (HE3SP) Neutrons were slowed down in plastic and then 4166600100016 detected by He-3 proportional counters. 4166600100017 Efficiency for 24 keV neutrons was measured with 4166600100018 calibrated Sb-Be source to be (6.6+-0.3) % . 4166600100019 Efficiency for U-235 fission neutrons (4.5+-0.2) % 4166600100020 SAMPLE 3 g tablet of HfO(2) powder, Hf-180 enriched to 73.7 %4166600100021 were irradiated by thermal neutrons (flux measured by 4166600100022 iron foils (3.3+-0.2)*10**14 /sec/cm2 ) to produce 4166600100023 Hf-180-M. Activation CS of isomer 0.433+-0.002 b . 4166600100024 Then target containing ~6 mg of isomer was irradiated 4166600100025 at external thermal neutron beam. 4166600100026 CORRECTION For background - 0.7% . 4166600100027 Attenuation of neutron flux - 0.93+-0.10 . 4166600100028 Self-shielding - 0.95+-0.02 . 4166600100029 Activation due to epithermal neutrons - 1.2+-0.1 . 4166600100030 ERR-ANALYS (DATA-ERR) Main error due to uncertainty of neutron 4166600100031 detection efficiency . 4166600100032 HISTORY (20190513C) M.M. 4166600100033 ENDBIB 31 0 4166600100034 NOCOMMON 0 0 4166600100035 ENDSUBENT 34 0 4166600199999 SUBENT 41666002 20190513 41824166600200001 BIB 3 8 4166600200002 REACTION (72-HF-180-M(N,INL)72-HF-180-L,,SIG) 4166600200003 Mentioned by authors as "INNA - inelastic neutron 4166600200004 acceleration" CS . 4166600200005 COMMENT Of authors. The experiment does not allow to determine4166600200006 which level of Hf-180 is excited after INNA. 4166600200007 Main contribution to this CS - from transition to 4166600200008 state with 6+ ( deltaEm3=0.5 MeV, l=1, j=3/2) . 4166600200009 STATUS (TABLE) Text, p. 384 of J.Phys.Lett.B,v.106,p.383,1981 4166600200010 ENDBIB 8 0 4166600200011 NOCOMMON 0 0 4166600200012 DATA 3 1 4166600200013 EN DATA DATA-ERR 4166600200014 EV B B 4166600200015 0.0253 52. 13. 4166600200016 ENDDATA 3 0 4166600200017 ENDSUBENT 16 0 4166600299999 ENDENTRY 2 0 4166699999999