ENTRY C2529 20200425 C195C252900000001 SUBENT C2529001 20200425 C195C252900100001 BIB 10 37 C252900100002 TITLE Element No. 102 C252900100003 AUTHOR (A.Ghiorso,T.Sikkeland,J.R.Walton,G.T.Seaborg) C252900100004 REFERENCE (J,PRL,1,18,1958) C252900100005 #doi:10.1103/PhysRevLett.1.18 C252900100006 INSTITUTE (1USABRK,1USAUCX) C252900100007 FACILITY (LINAC,1USABRK) The heavy ion linear accelerator C252900100008 (HILAC). C252900100009 DETECTOR (TRD) Nuclear emulsions. C252900100010 SAMPLE The target consisted of a mixture of isotopes of C252900100011 curium (95% Cm244 and 4.5% Cm246) mounted on a very C252900100012 thin nickel foil. The target was approximately 0.5 C252900100013 mg/cm2 thick and was covered with ~75-microg/cm2 C252900100014 aluminum to prevent curium "knockover". C252900100015 (96-CM-244,ENR=0.95) C252900100016 (96-CM-246,ENR=0.045) C252900100017 METHOD (CHSEP,ASPEC) In a series of experiments it was found C252900100018 that Fm250 could be collected on the catcher foils in C252900100019 accordance with a parent of half-life 3 seconds C252900100020 produced in the reaction Cm246(C12,4n)No254) . The C252900100021 number of Fm250 counts observed in a single C252900100022 experiment was as great as 40 and corresponded to a C252900100023 maximum cross section of a few microbarns for the C252900100024 reaction with Cm246. Nuclear emulsions placed above C252900100025 the moving belt to receive the alpha particles from C252900100026 the decaying 102 atoms are being scanned to determine C252900100027 the alpha energy of the 3-second No254, but there are C252900100028 difficulties with this method since there are C252900100029 hundreds of times as many tracks due to Fm250, Cf245, C252900100030 Cf246, and other alpha emitters. The final C252900100031 identification of the activity ascribed to Fm250 was C252900100032 carried out by dissolving the activity from the C252900100033 catcher foil and separating it from the other C252900100034 actinide elements by elution with ammonium C252900100035 alpha-hydroxyisobutyrate from a column packed with C252900100036 Dowex-50 cation exchange resin. C252900100037 DECAY-DATA (102-NO-254,3.0SEC,A) Measured by authors. C252900100038 HISTORY (20200425C) BP C252900100039 ENDBIB 37 0 C252900100040 NOCOMMON 0 0 C252900100041 ENDSUBENT 40 0 C252900199999 SUBENT C2529002 20200425 C195C252900200001 BIB 3 5 C252900200002 REACTION (96-CM-246(6-C-12,4N)102-NO-254,,SIG) C252900200003 ADD-RES Peak at 70 +- 5 MeV corresponding to a (C12,4n) C252900200004 reaction with a maximum cross section of a few C252900200005 microbarns for the reaction with Cm246. C252900200006 STATUS Page 20. C252900200007 ENDBIB 5 0 C252900200008 NOCOMMON 0 0 C252900200009 NODATA 0 0 C252900200010 ENDSUBENT 9 0 C252900299999 ENDENTRY 2 0 C252999999999