ENTRY C2537 20200501 C196C253700000001 SUBENT C2537001 20200501 C196C253700100001 BIB 11 32 C253700100002 TITLE Search for Superheavy Elements in the Bombardment of C253700100003 248Cm with 48Ca C253700100004 AUTHOR (E.K.Hulet,R.W.Lougheed,J.F.Wild,J.H.Landrum, C253700100005 P.C.Stevenson,A.Ghiorso,J.M.Nitschke,R.J.Otto, C253700100006 D.J.Morrissey,P.A.Baisden,B.F.Gavin,D.Lee,R.J.Silva, C253700100007 M.M.Fowler,G.T.Seaborg) C253700100008 REFERENCE (J,PRL,39,385,1977) C253700100009 #doi:10.1103/PhysRevLett.39.385 C253700100010 (J,JIN,40,589,1978) Radiochemistry description. C253700100011 #doi:10.1016/0022-1902(78)80372-8 C253700100012 INSTITUTE (1USALRL,1USABRK) C253700100013 FACILITY (LINAC,1USABRK) SupeHILAC. C253700100014 INC-SPECT 48Ca-ion bombardments with beam intensities from C253700100015 3x10**11 to 6x10**11 particles/s and lasting from 10 h C253700100016 up to 2 d. C253700100017 SAMPLE (96-CM-248,ENR=0.97) The 248Cm target was 6 mm in C253700100018 diameter and contained 20 microg/mm2 of 248Cm C253700100019 deposited as CmF, onto 0.013-mm Be by vacuum C253700100020 sublimation. Thus, the energy spread within the C253700100021 target was 267 to 243 MeV, corresponding to an C253700100022 average excitation energy of 40 to 50 MeV for the C253700100023 compound nucleus. C253700100024 DETECTOR (SIBAR) C253700100025 PART-DET (A) C253700100026 METHOD (CHSEP,REC) Recoil products from each bombardment C253700100027 were stopped 2nd collected in a 0.013-mm Be foil that C253700100028 was then chemically processed in one of three C253700100029 separation schemes. Each separation scheme was used C253700100030 to isolate the SHE's from other reaction products and C253700100031 from any 248Cm that may have reached the recoil C253700100032 collection foil. C253700100033 HISTORY (20200501C) BP C253700100034 ENDBIB 32 0 C253700100035 COMMON 1 3 C253700100036 EN C253700100037 MEV C253700100038 267.0 C253700100039 ENDCOMMON 3 0 C253700100040 ENDSUBENT 39 0 C253700199999 SUBENT C2537002 20200501 C196C253700200001 BIB 3 7 C253700200002 REACTION (96-CM-248(20-CA-48,X)ELEM/MASS,,SIG) C253700200003 METHOD Approximate yields of transcurium nuclides produced C253700200004 from transfer reactions in the bombardment of 248Cm C253700200005 with 48Ca. Only products recoiling within an included C253700200006 angle of 100 deg (lab) were measured. C253700200007 STATUS (CURVE) Fig. 1, page 387 of Phys.Rev.Lett.,39,385, C253700200008 1977. C253700200009 ENDBIB 7 0 C253700200010 NOCOMMON 0 0 C253700200011 DATA 3 13 C253700200012 ELEMENT MASS DATA-APRX C253700200013 NO-DIM NO-DIM B C253700200014 98.0 248.000 1.641E-05 C253700200015 98.0 250.000 1.044E-04 C253700200016 98.0 252.000 1.752E-05 C253700200017 98.0 253.000 1.401E-06 C253700200018 98.0 254.000 2.455E-07 C253700200019 99.0 252.000 4.542E-06 C253700200020 99.0 253.000 1.781E-06 C253700200021 99.0 254.000 3.188E-07 C253700200022 99.0 255.000 8.447E-08 C253700200023 99.0 256.000 1.299E-08 C253700200024 100.0 254.000 1.278E-07 C253700200025 100.0 255.000 1.456E-07 C253700200026 100.0 256.000 5.708E-08 C253700200027 ENDDATA 15 0 C253700200028 ENDSUBENT 27 0 C253700299999 SUBENT C2537003 20200501 C196C253700300001 BIB 6 26 C253700300002 REACTION (96-CM-248(20-CA-48,X)ELEM/MASS,CUM,SIG) C253700300003 METHOD (CHSEP) The most rapid separation (Scheme I) depends C253700300004 only on the coprecipitation of the SHE's with CuS. C253700300005 Two CuS precipitations were made, one from acid C253700300006 solution and one from basic solution. The yields for C253700300007 Au, Hg, and Bi tracer elements were typically greater C253700300008 than 80% in identical trial runs. These samples were C253700300009 continuously counted for 60 d using surface-barrier C253700300010 detectors. Includes yields of all parent nuclides in C253700300011 alpha- and beta-decay chains unless otherwise C253700300012 specified. C253700300013 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C253700300014 DECAY-DATA ((1.)83-BI-213,45.6MIN,A,8.375) C253700300015 ((2.)84-PO-210,138.38D,A,5.305) C253700300016 ((3.)85-AT-211,7.2HR,A,7.450) C253700300017 ((4.)88-RA-223,11.43D,A,7.386) C253700300018 ((5.)88-RA-224,3.64D,A,8.784) C253700300019 ((6.)89-AC-225,10.0D,A,8.375) C253700300020 FLAG (1.) Corrected for growth and decay formation from C253700300021 225Ac and 225Ra. C253700300022 (2.) Not corrected for growth and decay formation C253700300023 from 227Th. C253700300024 (3.) Not corrected for growth and decay formation of C253700300025 225Ra. C253700300026 STATUS (TABLE) Table I, page 387 of Phys.Rev.Lett.,39,385, C253700300027 1977. C253700300028 ENDBIB 26 0 C253700300029 NOCOMMON 0 0 C253700300030 DATA 6 6 C253700300031 ELEMENT MASS DATA DATA-ERR FLAG DECAY-FLAG C253700300032 NO-DIM NO-DIM MICRO-B MICRO-B NO-DIM NO-DIM C253700300033 83.0 213.0 130.0 30.0 1. 1.C253700300034 84.0 210.0 740.0 170.0 2.C253700300035 85.0 211.0 130.0 30.0 3.C253700300036 88.0 223.0 50.0 10.0 2. 4.C253700300037 88.0 224.0 35.0 10.0 5.C253700300038 89.0 225.0 160.0 40.0 3. 6.C253700300039 ENDDATA 8 0 C253700300040 ENDSUBENT 39 0 C253700399999 ENDENTRY 3 0 C253799999999