ENTRY            40126   20141115                             41694012600000001 
SUBENT        40126001   20141115                             41694012600100001 
BIB                 10         29                                 4012600100002 
INSTITUTE  (4RUSFEI)                                              4012600100003 
REFERENCE  (J,SJA,33,903,1972) Engl.Transl.of AE,33,788,1972      4012600100004 
           (J,AE,33,(3),788,1972)                                 4012600100005 
AUTHOR     (V.N.Kosyakov,V.G.Nesterov,B.Nurpeisov,L.I.Prokhorova, 4012600100006 
           G.N.Smirenkin,I.K.Shvetsov)                            4012600100007 
TITLE      Average yield of neutrons per spontaneous fission of   4012600100008 
           Bk-249.                                                4012600100009 
SAMPLE      About 7.0 microgram of Bk-249, obtained by treating   4012600100010 
           curium target irradiated in SM-2 reactor; separation   4012600100011 
           and purification were performed by the oxidation -     4012600100012 
           reduction extractive-chromatographic method.           4012600100013 
           Cf-252 content was no more than 10.E-10;               4012600100014 
           Cf-249 content was less or equal to 0.3%               4012600100015 
METHOD     (COINC)    Coincidence between pulses from             4012600100016 
           neutron detector and ionization chamber.               4012600100017 
           3.6E+4 fissions of Bk-249 , 2.2E+6 fissions of Cf-252  4012600100018 
           were registered.                                       4012600100019 
DETECTOR   (FISCH)  Ionization chamber for fissions registration  4012600100020 
           (PROPC)  Helium-3 proportional counters (24 counters)  4012600100021 
           in paraffin block for neutron registration .           4012600100022 
           Efficiency ~25.%.                                      4012600100023 
PART-DET   (N,FF) Neutrons and fission fragments.                 4012600100024 
ERR-ANALYS (DATA-ERR) No information available.                   4012600100025 
HISTORY    (19721226C) Data compiled at the centre.               4012600100026 
           (20141115A) SD: Updated to new date formats,lower case.4012600100027 
            Ref. on Engl.transl. of AE added. MONIT was added in  4012600100028 
            COMMON. Data units were corrected (NO-DIM -> PRT/FIS).4012600100029 
           (20150630A) M.M. Article was checked, BIB information  4012600100030 
           was updated. DATA 2 were added as primarily measured.  4012600100031 
ENDBIB              29          0                                 4012600100032 
NOCOMMON             0          0                                 4012600100033 
ENDSUBENT           32          0                                 4012600199999 
SUBENT        40126002   20141115                             41694012600200001 
BIB                  5          8                                 4012600200002 
REACTION  1(97-BK-249(0,F),PR,NU)                                 4012600200003 
          2((97-BK-249(0,F),PR,NU)/(98-CF-252(0,F),PR,NU))        4012600200004 
MONITOR   1(98-CF-252(0,F),PR,NU)                                 4012600200005 
MONIT-REF  (,C.Hanna+,J,REA,7,(3),4,1969)                         4012600200006 
STATUS     (TABLE) Text, p.904 of J,SJA,33,903,1972 .             4012600200007 
HISTORY    (20141115A) SD: Data units were corrected              4012600200008 
                                           (NO-DIM -> PRT/FIS).   4012600200009 
           (20150630A) M.M. DATA 2 were added -primarily measured.4012600200010 
ENDBIB               8          0                                 4012600200011 
NOCOMMON             0          0                                 4012600200012 
DATA                 5          1                                 4012600200013 
DATA      1DATA-ERR  1MONIT     1DATA      2DATA-ERR  2           4012600200014 
PRT/FIS    PRT/FIS    PRT/FIS    NO-DIM     NO-DIM                4012600200015 
 3.395      0.026       3.756     0.9039     0.0069               4012600200016 
ENDDATA              3          0                                 4012600200017 
ENDSUBENT           16          0                                 4012600299999 
ENDENTRY             2          0                                 4012699999999