ENTRY C2541 20200501 C196C254100000001 SUBENT C2541001 20200501 C196C254100100001 BIB 10 22 C254100100002 TITLE New isotope 242Bk C254100100003 AUTHOR (K.E.Williams,G.T.Seaborg) C254100100004 REFERENCE (J,PR/C,19,1794,1979) C254100100005 #doi:10.1103/PhysRevC.19.1794 C254100100006 INSTITUTE (1USABRK,1USAUCX) C254100100007 FACILITY (CYCLO,1USABRK) 88-inch cyclotron at the Lawrence C254100100008 Berkeley Laboratory. C254100100009 DETECTOR (SIBAR) Alpha particles were measured with 300-mm2 C254100100010 goldplated surface barrier detectors. C254100100011 PART-DET (A,XR) C254100100012 METHOD (CHSEP,ASPEC,XSPEC) Immediately following the C254100100013 irradiation, the catcher foil was dissolved in hot 8M C254100100014 HNO, in the presence of Hg+2. The berkelium products C254100100015 were oxidized to +4 using CrO, and were extracted C254100100016 into bis (2-ethylhexyl) orthophosphoric acid (HDEHP) C254100100017 in n- dodecane. The berkelium products were plated on C254100100018 1-inch diameter platinum disks for x-ray, gamma, C254100100019 and/or alpha counting. The time from the end of the C254100100020 bombardment (eob) to the start of counting was 12-14 C254100100021 min with a chemical yield of 50%. C254100100022 DECAY-DATA (97-BK-242,7.0MIN,EC) Measured by authors. C254100100023 HISTORY (20200501C) BP C254100100024 ENDBIB 22 0 C254100100025 NOCOMMON 0 0 C254100100026 ENDSUBENT 25 0 C254100199999 SUBENT C2541002 20200501 C196C254100200001 BIB 4 10 C254100200002 REACTION (92-U-235(5-B-11,4N)97-BK-242,,SIG) C254100200003 SAMPLE (92-U-235,ENR=0.941) The targets were prepared by C254100200004 electrospraying the nitrates dissolved in acetone C254100200005 onto 1-mil thick beryllium backing foils kept at C254100200006 250C. The 0.5-cm2 area targets were heated to red C254100200007 heat in an induction furnace to ensure conversion of C254100200008 the target material to the oxides. The typical target C254100200009 thickness was 400 microg/cm2. C254100200010 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C254100200011 STATUS (CURVE) Fig. 4, page 1796. C254100200012 ENDBIB 10 0 C254100200013 NOCOMMON 0 0 C254100200014 DATA 4 4 C254100200015 EN EN-ERR DATA DATA-ERR C254100200016 MEV MEV MICRO-B MICRO-B C254100200017 54.973 1.567 3.949E+00 1.552E+00 C254100200018 59.946 1.226 1.019E+01 1.918E+00 C254100200019 61.240 1.226 3.684E+00 1.531E+00 C254100200020 64.510 1.431 7.445E-01 2.512E-01 C254100200021 ENDDATA 6 0 C254100200022 ENDSUBENT 21 0 C254100299999 SUBENT C2541003 20200501 C196C254100300001 BIB 4 11 C254100300002 REACTION (90-TH-232(7-N-15,5N)97-BK-242,,SIG) C254100300003 SAMPLE The thorium isotopes were present in natural C254100300004 abundance. The targets were prepared by C254100300005 electrospraying the nitrates dissolved in acetone C254100300006 onto 1-mil thick beryllium backing foils kept at C254100300007 250C. The 0.5-cm2 area targets were heated to red C254100300008 heat in an induction furnace to ensure conversion of C254100300009 the target material to the oxides. The typical target C254100300010 thickness was 400 microg/cm2. C254100300011 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C254100300012 STATUS (CURVE) Fig. 5, page 1796. C254100300013 ENDBIB 11 0 C254100300014 NOCOMMON 0 0 C254100300015 DATA 4 5 C254100300016 EN EN-ERR DATA DATA-ERR C254100300017 MEV MEV MICRO-B MICRO-B C254100300018 76.160 1.277 2.670E+00 4.718E-01 C254100300019 82.995 1.113 9.110E+00 1.097E+00 C254100300020 85.308 0.989 7.594E+00 1.069E+00 C254100300021 88.583 1.359 4.192E+00 1.012E+00 C254100300022 91.400 1.236 2.580E+00 7.832E-01 C254100300023 ENDDATA 7 0 C254100300024 ENDSUBENT 23 0 C254100399999 SUBENT C2541004 20200501 C196C254100400001 BIB 5 15 C254100400002 REACTION (92-U-235(5-B-11,X)ELEM/MASS,,SIG) C254100400003 SAMPLE (92-U-235,ENR=0.941) The targets were prepared by C254100400004 electrospraying the nitrates dissolved in acetone C254100400005 onto 1-mil thick beryllium backing foils kept at C254100400006 250C. The 0.5-cm2 area targets were heated to red C254100400007 heat in an induction furnace to ensure conversion of C254100400008 the target material to the oxides. The typical target C254100400009 thickness was 400 microg/cm2. C254100400010 METHOD (CHSEP) Curium and americium were chemically C254100400011 separated from the catcher foil and the final C254100400012 chemical fraction was analyzed for the emission of C254100400013 both gamma rays and alpha particles. C254100400014 FLAG (1.) 242Am beta- decay. C254100400015 (2.) 242Bk EC, 242Am beta- decay. C254100400016 STATUS (TABLE) Table I, page 1798. C254100400017 ENDBIB 15 0 C254100400018 COMMON 1 3 C254100400019 EN C254100400020 MEV C254100400021 60.0 C254100400022 ENDCOMMON 3 0 C254100400023 DATA 4 8 C254100400024 ELEMENT MASS DATA FLAG C254100400025 NO-DIM NO-DIM MICRO-B NO-DIM C254100400026 95.0 238.0 1.6 C254100400027 95.0 239.0 410.0 C254100400028 95.0 240.0 1500.0 C254100400029 96.0 240.0 0.035 C254100400030 96.0 242.0 68.0 1. C254100400031 96.0 242.0 78.0 2. C254100400032 97.0 242.0 10.0 C254100400033 97.0 243.0 1.0 C254100400034 ENDDATA 10 0 C254100400035 ENDSUBENT 34 0 C254100499999 SUBENT C2541005 20200501 C196C254100500001 BIB 5 15 C254100500002 REACTION (92-U-238(5-B-10,X)ELEM/MASS,,SIG) C254100500003 SAMPLE (92-U-235,ENR=0.999) The targets were prepared by C254100500004 electrospraying the nitrates dissolved in acetone C254100500005 onto 1-mil thick beryllium backing foils kept at C254100500006 250C. The 0.5-cm2 area targets were heated to red C254100500007 heat in an induction furnace to ensure conversion of C254100500008 the target material to the oxides. The typical target C254100500009 thickness was 400 microg/cm2. C254100500010 METHOD (CHSEP) Curium and americium were chemically C254100500011 separated from the catcher foil and the final C254100500012 chemical fraction was analyzed for the emission of C254100500013 both gamma rays and alpha particles. C254100500014 FLAG (1.) 242Am beta- decay. C254100500015 (2.) 242Bk EC, 242Am beta- decay. C254100500016 STATUS (TABLE) Table I, page 1798. C254100500017 ENDBIB 15 0 C254100500018 COMMON 1 3 C254100500019 EN C254100500020 MEV C254100500021 67.0 C254100500022 ENDCOMMON 3 0 C254100500023 DATA 4 4 C254100500024 ELEMENT MASS DATA FLAG C254100500025 NO-DIM NO-DIM MICRO-B NO-DIM C254100500026 96.0 240.0 0.12 C254100500027 96.0 242.0 51.0 1. C254100500028 96.0 242.0 60.0 2. C254100500029 97.0 242.0 8.9 C254100500030 ENDDATA 6 0 C254100500031 ENDSUBENT 30 0 C254100599999 SUBENT C2541006 20200501 C196C254100600001 BIB 5 16 C254100600002 REACTION (90-TH-232(7-N-14,X)ELEM/MASS,,SIG) C254100600003 SAMPLE The thorium isotopes were present in natural C254100600004 abundance. The targets were prepared by C254100600005 electrospraying the nitrates dissolved in acetone C254100600006 onto 1-mil thick beryllium backing foils kept at C254100600007 250C. The 0.5-cm2 area targets were heated to red C254100600008 heat in an induction furnace to ensure conversion of C254100600009 the target material to the oxides. The typical target C254100600010 thickness was 400 microg/cm2. C254100600011 METHOD (CHSEP) Curium and americium were chemically C254100600012 separated from the catcher foil and the final C254100600013 chemical fraction was analyzed for the emission of C254100600014 both gamma rays and alpha particles. C254100600015 FLAG (1.) 242Am beta- decay. C254100600016 (2.) 242Bk EC, 242Am beta- decay. C254100600017 STATUS (TABLE) Table I, page 1798. C254100600018 ENDBIB 16 0 C254100600019 COMMON 1 3 C254100600020 EN C254100600021 MEV C254100600022 77.0 C254100600023 ENDCOMMON 3 0 C254100600024 DATA 4 5 C254100600025 ELEMENT MASS DATA FLAG C254100600026 NO-DIM NO-DIM MICRO-B NO-DIM C254100600027 95.0 240.0 200.0 C254100600028 96.0 240.0 0.055 C254100600029 96.0 242.0 0.52 1. C254100600030 96.0 242.0 1.0 2. C254100600031 97.0 242.0 0.48 C254100600032 ENDDATA 7 0 C254100600033 ENDSUBENT 32 0 C254100699999 ENDENTRY 6 0 C254199999999