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