ENTRY C2550 20200502 C197C255000000001 SUBENT C2550001 20200502 C197C255000100001 BIB 10 36 C255000100002 TITLE Search for superheavy elements using the 48Ca+254Esg C255000100003 reaction C255000100004 AUTHOR (R.W.Lougheed,J.H.Landrum,E.K.Hulet,J.F.Wild, C255000100005 R.J.Dougan,A.D.Dougan,H.Gaggeler,M.Schadel,K.J.Moody, C255000100006 K.E.Gregorich,G.T.Seaborg) C255000100007 REFERENCE (J,PR/C,32,1760,1985) C255000100008 #doi:10.1103/PhysRevC.32.1760 C255000100009 INSTITUTE (1USALRL,2GERGSI,1USABRK) C255000100010 FACILITY (LINAC,1USABRK) The super heavy ion linear accelerator C255000100011 (SuperHILAC). C255000100012 SAMPLE Target containing 1.14x10**16 atoms/cm2 254Es. The C255000100013 target also contained 0.7x10**16 atoms/cm2 of 250Cf C255000100014 from decay of the Es. The Es was electroplated in a C255000100015 3.0-mm-diam spot on a 2.2 mg/cm2 Be foil that had C255000100016 been coated with a 0.2 mg/cm2 Pd layer to prevent C255000100017 attack of the Be by the electroplating solution. A C255000100018 0.02 mg/cm2 Pd layer was then vaporized over the Es C255000100019 oxide deposit to reduce transfer of Es to the recoil C255000100020 collecting foils during bombardment. C255000100021 DETECTOR (SIBAR) C255000100022 METHOD (REC,CHSEP,COINC) Target was bombarded with 48Ca at C255000100023 the SuperHILAC accelerator. Two bombardment energies C255000100024 were chosen: one just at the estimated fusion barrier C255000100025 and one several MeV above to compensate for any C255000100026 extra-push energy that might be required for fusion C255000100027 in such a heavy system. The resultant excitation C255000100028 energies in the compound nucleus were 26 and 34 MeV, C255000100029 respectively. Recoils from the Es target were C255000100030 collected on either beryllium or copper foils that C255000100031 were chemically processed to yield Super Heavy C255000100032 Element (SHE) fractions mounted on thin foils for C255000100033 coincident counting. Spontaneous-fission counting was C255000100034 performed in a fragment-fragment coincidence mode C255000100035 with opposing surface-barrier detectors. C255000100036 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C255000100037 HISTORY (20200502C) BP C255000100038 ENDBIB 36 0 C255000100039 NOCOMMON 0 0 C255000100040 ENDSUBENT 39 0 C255000199999 SUBENT C2550002 20200502 C197C255000200001 BIB 2 2 C255000200002 REACTION (99-ES-254(20-CA-48,X)ELEM/MASS,,SIG) C255000200003 STATUS (TABLE) Table II, page 1762. C255000200004 ENDBIB 2 0 C255000200005 COMMON 1 3 C255000200006 EN C255000200007 MEV C255000200008 240.0 C255000200009 ENDCOMMON 3 0 C255000200010 DATA 4 2 C255000200011 ELEMENT MASS DATA DATA-ERR C255000200012 NO-DIM NO-DIM NB NB C255000200013 82.0 212.0 140.0 30.0 C255000200014 85.0 211.0 290.0 120.0 C255000200015 ENDDATA 4 0 C255000200016 ENDSUBENT 15 0 C255000299999 SUBENT C2550003 20200502 C197C255000300001 BIB 2 2 C255000300002 REACTION (99-ES-254(20-CA-48,X)ELEM/MASS,,SIG) C255000300003 STATUS (TABLE) Table II, page 1762. C255000300004 ENDBIB 2 0 C255000300005 COMMON 1 3 C255000300006 EN C255000300007 MEV C255000300008 249.0 C255000300009 ENDCOMMON 3 0 C255000300010 DATA 4 3 C255000300011 ELEMENT MASS DATA DATA-ERR C255000300012 NO-DIM NO-DIM NB NB C255000300013 82.0 212.0 590.0 120.0 C255000300014 85.0 209.0 1500.0 400.0 C255000300015 85.0 211.0 1100.0 200.0 C255000300016 ENDDATA 5 0 C255000300017 ENDSUBENT 16 0 C255000399999 ENDENTRY 3 0 C255099999999