ENTRY C2541 20200501 C196C2541 0 1 SUBENT C2541001 20200501 C196C2541 1 1 BIB 10 22 C2541 1 2 TITLE New isotope 242Bk C2541 1 3 AUTHOR (K.E.Williams,G.T.Seaborg) C2541 1 4 REFERENCE (J,PR/C,19,1794,1979) C2541 1 5 #doi:10.1103/PhysRevC.19.1794 C2541 1 6 INSTITUTE (1USABRK,1USAUCX) C2541 1 7 FACILITY (CYCLO,1USABRK) 88-inch cyclotron at the Lawrence C2541 1 8 Berkeley Laboratory. C2541 1 9 DETECTOR (SIBAR) Alpha particles were measured with 300-mm2 C2541 1 10 goldplated surface barrier detectors. C2541 1 11 PART-DET (A,XR) C2541 1 12 METHOD (CHSEP,ASPEC,XSPEC) Immediately following the C2541 1 13 irradiation, the catcher foil was dissolved in hot 8M C2541 1 14 HNO, in the presence of Hg+2. The berkelium products C2541 1 15 were oxidized to +4 using CrO, and were extracted C2541 1 16 into bis (2-ethylhexyl) orthophosphoric acid (HDEHP) C2541 1 17 in n- dodecane. The berkelium products were plated on C2541 1 18 1-inch diameter platinum disks for x-ray, gamma, C2541 1 19 and/or alpha counting. The time from the end of the C2541 1 20 bombardment (eob) to the start of counting was 12-14 C2541 1 21 min with a chemical yield of 50%. C2541 1 22 DECAY-DATA (97-BK-242,7.0MIN,EC) Measured by authors. C2541 1 23 HISTORY (20200501C) BP C2541 1 24 ENDBIB 22 0 C2541 1 25 NOCOMMON 0 0 C2541 1 26 ENDSUBENT 25 0 C2541 199999 SUBENT C2541002 20200501 C196C2541 2 1 BIB 4 10 C2541 2 2 REACTION (92-U-235(5-B-11,4N)97-BK-242,,SIG) C2541 2 3 SAMPLE (92-U-235,ENR=0.941) The targets were prepared by C2541 2 4 electrospraying the nitrates dissolved in acetone C2541 2 5 onto 1-mil thick beryllium backing foils kept at C2541 2 6 250C. The 0.5-cm2 area targets were heated to red C2541 2 7 heat in an induction furnace to ensure conversion of C2541 2 8 the target material to the oxides. The typical target C2541 2 9 thickness was 400 microg/cm2. C2541 2 10 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C2541 2 11 STATUS (CURVE) Fig. 4, page 1796. C2541 2 12 ENDBIB 10 0 C2541 2 13 NOCOMMON 0 0 C2541 2 14 DATA 4 4 C2541 2 15 EN EN-ERR DATA DATA-ERR C2541 2 16 MEV MEV MICRO-B MICRO-B C2541 2 17 54.973 1.567 3.949E+00 1.552E+00 C2541 2 18 59.946 1.226 1.019E+01 1.918E+00 C2541 2 19 61.240 1.226 3.684E+00 1.531E+00 C2541 2 20 64.510 1.431 7.445E-01 2.512E-01 C2541 2 21 ENDDATA 6 0 C2541 2 22 ENDSUBENT 21 0 C2541 299999 SUBENT C2541003 20200501 C196C2541 3 1 BIB 4 11 C2541 3 2 REACTION (90-TH-232(7-N-15,5N)97-BK-242,,SIG) C2541 3 3 SAMPLE The thorium isotopes were present in natural C2541 3 4 abundance. The targets were prepared by C2541 3 5 electrospraying the nitrates dissolved in acetone C2541 3 6 onto 1-mil thick beryllium backing foils kept at C2541 3 7 250C. The 0.5-cm2 area targets were heated to red C2541 3 8 heat in an induction furnace to ensure conversion of C2541 3 9 the target material to the oxides. The typical target C2541 3 10 thickness was 400 microg/cm2. C2541 3 11 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C2541 3 12 STATUS (CURVE) Fig. 5, page 1796. C2541 3 13 ENDBIB 11 0 C2541 3 14 NOCOMMON 0 0 C2541 3 15 DATA 4 5 C2541 3 16 EN EN-ERR DATA DATA-ERR C2541 3 17 MEV MEV MICRO-B MICRO-B C2541 3 18 76.160 1.277 2.670E+00 4.718E-01 C2541 3 19 82.995 1.113 9.110E+00 1.097E+00 C2541 3 20 85.308 0.989 7.594E+00 1.069E+00 C2541 3 21 88.583 1.359 4.192E+00 1.012E+00 C2541 3 22 91.400 1.236 2.580E+00 7.832E-01 C2541 3 23 ENDDATA 7 0 C2541 3 24 ENDSUBENT 23 0 C2541 399999 SUBENT C2541004 20200501 C196C2541 4 1 BIB 5 15 C2541 4 2 REACTION (92-U-235(5-B-11,X)ELEM/MASS,,SIG) C2541 4 3 SAMPLE (92-U-235,ENR=0.941) The targets were prepared by C2541 4 4 electrospraying the nitrates dissolved in acetone C2541 4 5 onto 1-mil thick beryllium backing foils kept at C2541 4 6 250C. The 0.5-cm2 area targets were heated to red C2541 4 7 heat in an induction furnace to ensure conversion of C2541 4 8 the target material to the oxides. The typical target C2541 4 9 thickness was 400 microg/cm2. C2541 4 10 METHOD (CHSEP) Curium and americium were chemically C2541 4 11 separated from the catcher foil and the final C2541 4 12 chemical fraction was analyzed for the emission of C2541 4 13 both gamma rays and alpha particles. C2541 4 14 FLAG (1.) 242Am beta- decay. C2541 4 15 (2.) 242Bk EC, 242Am beta- decay. C2541 4 16 STATUS (TABLE) Table I, page 1798. C2541 4 17 ENDBIB 15 0 C2541 4 18 COMMON 1 3 C2541 4 19 EN C2541 4 20 MEV C2541 4 21 60.0 C2541 4 22 ENDCOMMON 3 0 C2541 4 23 DATA 4 8 C2541 4 24 ELEMENT MASS DATA FLAG C2541 4 25 NO-DIM NO-DIM MICRO-B NO-DIM C2541 4 26 95.0 238.0 1.6 C2541 4 27 95.0 239.0 410.0 C2541 4 28 95.0 240.0 1500.0 C2541 4 29 96.0 240.0 0.035 C2541 4 30 96.0 242.0 68.0 1. C2541 4 31 96.0 242.0 78.0 2. C2541 4 32 97.0 242.0 10.0 C2541 4 33 97.0 243.0 1.0 C2541 4 34 ENDDATA 10 0 C2541 4 35 ENDSUBENT 34 0 C2541 499999 SUBENT C2541005 20200501 C196C2541 5 1 BIB 5 15 C2541 5 2 REACTION (92-U-238(5-B-10,X)ELEM/MASS,,SIG) C2541 5 3 SAMPLE (92-U-235,ENR=0.999) The targets were prepared by C2541 5 4 electrospraying the nitrates dissolved in acetone C2541 5 5 onto 1-mil thick beryllium backing foils kept at C2541 5 6 250C. The 0.5-cm2 area targets were heated to red C2541 5 7 heat in an induction furnace to ensure conversion of C2541 5 8 the target material to the oxides. The typical target C2541 5 9 thickness was 400 microg/cm2. C2541 5 10 METHOD (CHSEP) Curium and americium were chemically C2541 5 11 separated from the catcher foil and the final C2541 5 12 chemical fraction was analyzed for the emission of C2541 5 13 both gamma rays and alpha particles. C2541 5 14 FLAG (1.) 242Am beta- decay. C2541 5 15 (2.) 242Bk EC, 242Am beta- decay. C2541 5 16 STATUS (TABLE) Table I, page 1798. C2541 5 17 ENDBIB 15 0 C2541 5 18 COMMON 1 3 C2541 5 19 EN C2541 5 20 MEV C2541 5 21 67.0 C2541 5 22 ENDCOMMON 3 0 C2541 5 23 DATA 4 4 C2541 5 24 ELEMENT MASS DATA FLAG C2541 5 25 NO-DIM NO-DIM MICRO-B NO-DIM C2541 5 26 96.0 240.0 0.12 C2541 5 27 96.0 242.0 51.0 1. C2541 5 28 96.0 242.0 60.0 2. C2541 5 29 97.0 242.0 8.9 C2541 5 30 ENDDATA 6 0 C2541 5 31 ENDSUBENT 30 0 C2541 599999 SUBENT C2541006 20200501 C196C2541 6 1 BIB 5 16 C2541 6 2 REACTION (90-TH-232(7-N-14,X)ELEM/MASS,,SIG) C2541 6 3 SAMPLE The thorium isotopes were present in natural C2541 6 4 abundance. The targets were prepared by C2541 6 5 electrospraying the nitrates dissolved in acetone C2541 6 6 onto 1-mil thick beryllium backing foils kept at C2541 6 7 250C. The 0.5-cm2 area targets were heated to red C2541 6 8 heat in an induction furnace to ensure conversion of C2541 6 9 the target material to the oxides. The typical target C2541 6 10 thickness was 400 microg/cm2. C2541 6 11 METHOD (CHSEP) Curium and americium were chemically C2541 6 12 separated from the catcher foil and the final C2541 6 13 chemical fraction was analyzed for the emission of C2541 6 14 both gamma rays and alpha particles. C2541 6 15 FLAG (1.) 242Am beta- decay. C2541 6 16 (2.) 242Bk EC, 242Am beta- decay. C2541 6 17 STATUS (TABLE) Table I, page 1798. C2541 6 18 ENDBIB 16 0 C2541 6 19 COMMON 1 3 C2541 6 20 EN C2541 6 21 MEV C2541 6 22 77.0 C2541 6 23 ENDCOMMON 3 0 C2541 6 24 DATA 4 5 C2541 6 25 ELEMENT MASS DATA FLAG C2541 6 26 NO-DIM NO-DIM MICRO-B NO-DIM C2541 6 27 95.0 240.0 200.0 C2541 6 28 96.0 240.0 0.055 C2541 6 29 96.0 242.0 0.52 1. C2541 6 30 96.0 242.0 1.0 2. C2541 6 31 97.0 242.0 0.48 C2541 6 32 ENDDATA 7 0 C2541 6 33 ENDSUBENT 32 0 C2541 699999 ENDENTRY 6 0 C254199999999