ENTRY C2514 20200327 C194C251400000001 SUBENT C2514001 20200327 C194C251400100001 BIB 11 31 C251400100002 TITLE Atom-at-a-time radiochemical separations of the C251400100003 heaviest elements: Lawrencium chemistry C251400100004 AUTHOR (D.C.Hoffman,R.A.Henderson,K.E.Gregorich,D.A.Bennett, C251400100005 R.M.Chasteler,C.M.Gannett,H.L.Hall,D.M.Lee,M.J.Nurmia, C251400100006 S.Cai, R.Agarwal,A.W.Charlop,Y.Y.Chu,G.T.Seaborg, C251400100007 R.J.Silva) C251400100008 REFERENCE (J,JRN,124,135,1988) Preliminary data. C251400100009 #doi:10.1007/bf02035512 C251400100010 (T,HENDERSON,1990) University of California, Berkeley. C251400100011 REL-REF (M,,K.E.Gregorich+,J,RCA,43,223,1988) C251400100012 Advanced chemistry C251400100013 #doi:10.1524/ract.1988.43.4.223 C251400100014 INSTITUTE (1USAUCX,1USABRK,1USALRL) C251400100015 FACILITY (CYCLO,1USABRK) LBL 88-inch cyclotron. C251400100016 DETECTOR (SIBAR) 300 mm2 Si(Au) surface barrier detectors. C251400100017 SAMPLE Target materials of 248Cm and 249Bk are produced at C251400100018 the High Flux Isotope Reactor, HFIR; at the Oak Ridge C251400100019 National Laboratory. C251400100020 PART-DET (A) C251400100021 METHOD (CHSEP,ASPEC) In order to verify that the activity C251400100022 was indeed properly assigned to Lr, extractions with C251400100023 0.1 M thenoyl trifluoroacetate (TTA) in C251400100024 methylisobutyl ketone (MIBK) were performed. The KCI C251400100025 deposit was dissolved in a buffer solution of C251400100026 monochloroacetic acid or acetic acid adjusted to pH C251400100027 ranges of 1.86 to 5.5. Extractions with TTA from C251400100028 buffer solutions of different pH were performed. The C251400100029 organic phase was dried on a Pt plate and alpha C251400100030 counted. The entire procedure required about three C251400100031 minutes. C251400100032 HISTORY (20200327C) BP C251400100033 ENDBIB 31 0 C251400100034 NOCOMMON 0 0 C251400100035 ENDSUBENT 34 0 C251400199999 SUBENT C2514002 20200327 C194C251400200001 BIB 6 16 C251400200002 REACTION (97-BK-249(8-O-18,3N+A)103-LR-260,,SIG) C251400200003 INC-SPECT Targets were irradiated with 117-MeV 1805+ C251400200004 projectiles resulting in incident energies on target C251400200005 of 102-MeV with intensities of about 0.5 particle- C251400200006 microA. C251400200007 SAMPLE Targets of Bk oxide containing about 0.9 mg/cm2 of C251400200008 249Bk (in a 6-mm diameter) were prepared by C251400200009 electrodeposition 13 with a 6-mm diameter on 2.75 C251400200010 mg/cm2 Be foil. C251400200011 ERR-ANALYS (DATA-ERR) The error limit is statistical plus an C251400200012 additional ten percent to account for variations in C251400200013 the beam intensity and gas jet yields that are C251400200014 otherwise not accounted for. C251400200015 DECAY-DATA (103-LR-260,2.7MIN,A) Measured by authors: error C251400200016 limits of half-life (+1.7 / -0.9). C251400200017 STATUS (TABLE) page 37 of thesis Henderson. C251400200018 ENDBIB 16 0 C251400200019 NOCOMMON 0 0 C251400200020 DATA 3 1 C251400200021 EN DATA DATA-ERR C251400200022 MEV NB NB C251400200023 101.0 8.3 1.7 C251400200024 ENDDATA 3 0 C251400200025 ENDSUBENT 24 0 C251400299999 SUBENT C2514003 20200327 C194C251400300001 BIB 5 7 C251400300002 REACTION (96-CM-248(8-O-18,X)103-LR-261,,SIG) C251400300003 REL-REF (O,14636002,R.A.Henderson+,T,HENDERSON,1990) 262Lr C251400300004 spontaneous fission total kinetic energy data. C251400300005 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C251400300006 DECAY-DATA (103-LR-261,44.0MIN,A) Measured by authors: C251400300007 44 (+17/-11) minutes. C251400300008 STATUS (TABLE) page 49 of thesis Henderson. C251400300009 ENDBIB 7 0 C251400300010 NOCOMMON 0 0 C251400300011 DATA 3 1 C251400300012 EN-APRX DATA DATA-ERR C251400300013 MEV PB PB C251400300014 97.0 700.0 70.0 C251400300015 ENDDATA 3 0 C251400300016 ENDSUBENT 15 0 C251400399999 SUBENT C2514004 20200327 C194C251400400001 BIB 4 4 C251400400002 REACTION (96-CM-248(8-O-18,X)103-LR-262,,SIG) C251400400003 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C251400400004 DECAY-DATA (103-LR-262,3.6HR,A) Measured by authors. C251400400005 STATUS (TABLE) page 53 of thesis Henderson. C251400400006 ENDBIB 4 0 C251400400007 NOCOMMON 0 0 C251400400008 DATA 3 1 C251400400009 EN DATA DATA-ERR C251400400010 MEV PB PB C251400400011 93.0 240.0 24.0 C251400400012 ENDDATA 3 0 C251400400013 ENDSUBENT 12 0 C251400499999 SUBENT C2514005 20200327 C194C251400500001 BIB 3 3 C251400500002 REACTION (97-BK-249(8-O-18,5N)105-DB-262,,SIG) C251400500003 DECAY-DATA (105-DB-262,34.0SEC,A) C251400500004 STATUS (TABLE) page 58 of thesis Henderson. C251400500005 ENDBIB 3 0 C251400500006 NOCOMMON 0 0 C251400500007 DATA 2 1 C251400500008 EN-APRX DATA C251400500009 MEV NB C251400500010 100.0 5.0 C251400500011 ENDDATA 3 0 C251400500012 ENDSUBENT 11 0 C251400599999 ENDENTRY 5 0 C251499999999