ENTRY 14636 20200408 14701463600000001 SUBENT 14636001 20200408 14701463600100001 BIB 11 29 1463600100002 TITLE Chemical and Nuclear Properties of Lawrencium 1463600100003 (Element 103) and Hahnium (Element 105) 1463600100004 AUTHOR (R.A.Henderson) 1463600100005 REFERENCE (T,HENDERSON,1990) University of California, Berkeley. 1463600100006 REL-REF (O,C2514003,D.C.Hoffmann+,J,JRN,124,135,1988) 1463600100007 262Lr production cross section data. 1463600100008 INSTITUTE (1USAUCX,1USABRK) 1463600100009 FACILITY (CYCLO,1USABRK) LBL 88-inch cyclotron. 1463600100010 DETECTOR (SIBAR) 300 mm2 Si(Au) surface barrier detectors. 1463600100011 METHOD (CHSEP,ASPEC) In order to verify that the activity 1463600100012 was indeed properly assigned to Lr, extractions with 1463600100013 0.1 M thenoyl trifluoroacetate (TTA) in 1463600100014 methylisobutyl ketone (MIBK) were performed. The KCI 1463600100015 deposit was dissolved in a buffer solution of 1463600100016 monochloroacetic acid or acetic acid adjusted to pH 1463600100017 ranges of 1.86 to 5.5. Extractions with TTA from 1463600100018 buffer solutions of different pH were performed. The 1463600100019 organic phase was dried on a Pt plate and alpha 1463600100020 counted. The entire procedure required about three 1463600100021 minutes. The energy histogram of the 62 fission 1463600100022 events was observed. Whatever the fissioning species 1463600100023 is, it has reasonably symmetric mass division with a 1463600100024 total kinetic energy of about 210 MeV, which is 1463600100025 calculated by taking a weighted average over the 1463600100026 252Cf spectrum, normalizing to TKE=186.5 MeV for 1463600100027 252Cf, and scaling the 261Lr data to it. 1463600100028 MONITOR (98-CF-252(0,F),(SEC),AKE,LF+HF) 1463600100029 MONIT-REF ((MONIT),D.C.Hoffmann+,R,LBL-23475,1987) 1463600100030 HISTORY (20200408C) BP 1463600100031 ENDBIB 29 0 1463600100032 COMMON 1 3 1463600100033 MONIT 1463600100034 MEV 1463600100035 186.5 1463600100036 ENDCOMMON 3 0 1463600100037 ENDSUBENT 36 0 1463600199999 SUBENT 14636002 20200408 14701463600200001 BIB 6 8 1463600200002 REACTION (103-LR-261(0,F),(SEC),AKE,LF+HF) 1463600200003 SAMPLE Lr-261 was poduced by Cm-248(O-18,p4n) reaction. 1463600200004 ANALYSIS The fragments may come either from fission of Lr-261 1463600200005 or, after electron capture, from No-261. 1463600200006 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. 1463600200007 DECAY-DATA (103-LR-261,44.0MIN,A) Measured by authors: 44(+17/-11)1463600200008 minutes. 1463600200009 STATUS (TABLE) page 49 of thesis Henderson. 1463600200010 ENDBIB 8 0 1463600200011 NOCOMMON 0 0 1463600200012 DATA 2 1 1463600200013 DATA DATA-ERR 1463600200014 MEV MEV 1463600200015 210.0 10.0 1463600200016 ENDDATA 3 0 1463600200017 ENDSUBENT 16 0 1463600299999 ENDENTRY 2 0 1463699999999