246CM 246BK EC DECAY 1976AH03 24NDS 202410
246CM H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 198, 449 (2024)$CUT=31-Jul-2022$
246CM c 1976Ah03: {+246}Bk was produced from the irradiation of {+243}Am with
246CM2c 34 MeV |a particles at the Argonne 152 cm cyclotron. The chemically
246CM3c mass separated {+246}Bk was then processed into a thin source.
246CM4c The electron capture decay of {+246}Bk was investigated by measuring
246CM5c the gamma-rays and conversion-electron spectra with Ge(Li) and
246CM6c Si(Li) detectors, respectively. Measured T{-1/2} of {+246}Bk, E|g,
246CM7c I|g, E(ce), Ice, ce|g-coin, Deduced levels, multipolarity, J|p and
246CM8c log{Ift}. See earlier report: 1966Ah02
246CM c Other: 1966Or01
246CM c
246CM cE IE$From level scheme intensity balance, unless otherwise noted.
246CM2cE In order to generate an output from the LOGFT code, the evaluator
246CM3cE had set the E(parent)=0.0
246CM cG $The evaluator calculated the number of K-shell holes due to internal
246CM2cG conversions (0.49 {I2}) and electron captures (69 {I8}).
246CM3cG The latter was deduced from |e branchings and theoretical K/|e ratios
246CM4cG for Q+=1350 {I60} keV. Experimental K-shell fluorescence yield
246CM5cG correction of 0.971 {I6} (1979Ah01) was used in the calculation to
246CM6cG determine the total I(K| x ray)= 68 % {I8} which is in agreement
246CM7cG with the measured value 63 % {I4} by 1976Ah03
246CM cG
246CM tG $ ----------------------------------------------------------
246CM tG $ Measured x-ray intensities (1976Ah03)
246CM tG $ Energy Intensity x-ray
246CM tG $
246CM tG $ ----------------------------------------------------------
246CM tG $ 104.6 {I1} 19.0 {I13} Cm K|a{-2}|
246CM tG $ 109.3 {I1} 29.0 {I2} Cm K|a{-1}|
246CM tG $ 123.2 {I2} 11.0 {I8} Cm K|b{-1}'|
246CM tG $ 127.1 {I2} 4.0 {I3} Cm K|b{-2}'|
246CM tG $ |S I(K| x ray)=63 {I4} (1976Ah03)
246CM tG $ ----------------------------------------------------------
246CM c
246CM c Using program RadiationReport, the evaluator has calculated from the
246CM2c decay scheme, x-ray intensities as follows: K|a{-2}| x ray=19.7 {I24},
246CM3c K|a{-1} x ray=30.9 {I38}, K|b{-12} x ray=15.6 {I19}. These values are
246CM4c compared with experimental results (1976Ah03) of K|a{-2} x ray=19.0
246CM5c {I13}, K|a{-1} x ray=29.0 {I2}, and (K|b{-1} x ray=11.0 {I8} +
246CM6c K|b{-2} x ray=4.0 {I3})= 15.0 {I8}. This agreement confirms the
246CM7c quality of the data and the consistency of the decay scheme.
246CM cG
246CM cG E,RI$From 1976Ah03, unless otherwise noted
246CM cG M$From Adopted Gammas. |a and ce-ratios from 1976Ah03 are given in
246CM2cG comments. Normalization of I(ce) to I|g not stated (1976Ah03);
246CM3cG normalized to |a(K)(799|g,E1)=0.00524 (1966Or01).
246CM cG E(A)$Observed in ce spectrum only (1976Ah03).
246CM cG RI(A)$Deduced by the evaluator from I(|g+ce) and |a
246CM cG E(D),RI(D)$The 1124.3|g appears to be a doublet from {+246}Am (25 min)
246CM2cG decay. From {+246}Am (25 min) decay I|g(1122.64)/I|g(1023.44)=2.5 {I3},
246CM3cG the evaluator deduced I|g(1122.64)=0.38 {I7} at E=1165-keV level
246CMxcG and I|g(1124.3)=4.4 {I3} at E=1124-keV level
246CM cL J,T$From Adopted Levels
246CM cL E$Deduced by the evaluator from least-squares fit to E|g data.
246CM DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
246BK P 0.0+X 2(-) 1.80 D 2 1350 60
246BK cP QP$From 2021Wa16
246CM N 1.02 7 1.02 7 1.00
246CM PN 4
246CM cN NR$From |SI(|g+ce)(to 0.0+43 level)= 91% {I4}.
246CM2cN (I(|g+ce)(42.8|g) not included in this sum), since I|b{+-}(g.s.) +
246CM3cN I|b(42-keV state)=9% {I4} (1976Ah03). Uncertainty was not provided by
246CM4cN authors (1976Ah03), but was assigned by the evaluator
246CM4cN |e(g.s.)<8% from K| x ray intensity (1976Ah03).
246CM L 0.0 0+ 4706 Y 40
246CM E 3 LE 9.7 GE 1U
246CMS E CK=0.714 4$CL=0.209 3$CM+=0.0774 12
246CM cE IE$ -6 % {I9} deduced by the evaluator from I(K| x ray), Q(|e),
246CM2cE |e branchings, theoretical K/|e ratios of the proposed level scheme
246CM3cE and the experimental K-shell fluorescence yield |w=0.976 (1976Ah03).
246CM2cE Negative feeding -9 % {I10} was also deduced by 1976Ah03. A limit
246CM3cE of I|e|<3 is given by the evaluator.
246CM L 42.85 10 2+ 123.2 PS 23
246CM E 7.5 AP 8.5 AP
246CMS E CK=0.7484 17$CL=0.1850 12$CM+=0.0666 6
246CM G 42.8 0.085 APE2 1070 1591 APA
246CMS G L/T=0.723 8$M/T=0.204 4
246CMS G N/T=0.0566 11$O/T=0.01368 27$P/T=0.00223 4$Q/T=5.49E-6 11
246CMS G LC=774 11$MC=218.1 31
246CMS G NC=60.6 8$OC=14.65 21$PC=2.393 34$QC=0.00587 8
246CM2 G %IG AP 0.087
246CM cG TI$From Ice(L1+L2)|?35, Ice(L3)|?30, Ice(M)=18.5 {I14},
246CM2cG and Ice(N+O)=7.3 {I6} (1976Ah03).
246CM cG M$L1+L2:L3|? 35:30 (1976Ah03) M:N+O= 18.5 {I14}:7.3 {6} (1976Ah03).
246CM L 142.06 12 4+
246CM E 0.56 LE 10.2 GE 1U
246CMS E CK=0.704 5$CL=0.215 4$CM+=0.0804 16
246CM G 99.2 1 0.20 1 E2 19.43 294.0 2 A
246CMS G L/T=0.687 7$M/T=0.1943 35
246CMS G N/T=0.0541 11$O/T=0.01310 27$P/T=0.00217 4$Q/T=8.89E-6 18
246CMS G LC=14.05 21$MC=3.97 6
246CMS G NC=1.105 16$OC=0.268 4$PC=0.0444 7$QC=0.0001817 26
246CM2 G %IG=0.204 17
246CM cG TI$From Ice(L1+L2)=1.86 {I14}, Ice(L3)=1.25 {I9},
246CM2cG Ice(M)=0.89 {I17} (1976Ah03)
246CM cG M$L1+L2:L3:M= 1.86 {I14}:1.25 {I9}:0.89 {I7} (1976Ah03).
246CM L 841.55 122-
246CM E 50 6 6.74 15
246CMS E CK=0.682 18$CL=0.231 13$CM+=0.087 6
246CM G 798.7 1 61 4 E1 0.00648 9
246CMS G KC=0.00523 7$LC=0.000941 13$MC=0.0002260 32
246CMS G NC=6.17E-5 9$OC=1.560E-5 22$PC=3.01E-6 4$QC=2.017E-7 28
246CM2 G %IG=62 6
246CM cG M$K:L1+L2:L3:|a(K)exp:|a(L1+L2)exp:|a(L3)exp:K/L=
246CM2cG 0.32 {I2}:0.055 {I4}:0.005 {I1}:0.0052:0.0009:0.000081:|?5.2
246CM L 876.36 123-
246CM E 21.5 22 7.03 16
246CMS E CK=0.673 22$CL=0.237 16$CM+=0.090 7
246CM G 34.8 1 0.0084 7 (M1,E2) 1.5E+3 14 12.9 16A
246CMS G LC=1.1E+3 10$MC=3.1E+2 28
246CMS G NC=9.E1 8$OC=21 19$PC=3.5 31$QC=0.021 7
246CM2 G %IG=0.0086 9
246CM cG M$M:N+O=2.6 {I2}:0.76 {I8}(1976Ah03). M1,E2 given by 1976Ah03.
246CM2cG Note that BrIccMixing code gives a high reduced |h{+2}
246CM cG TI$From I(ce(M))=2.6 {I2}, Ice(N+O)=0.76 {I8}, (1976Ah03)
246CM G 734.3 1 3.1 2 E1 0.0075211
246CMS G KC=0.00606 8$LC=0.001100 15$MC=0.000265 4
246CMS G NC=7.22E-5 10$OC=1.825E-5 26$PC=3.52E-6 5$QC=2.327E-7 33
246CM2 G %IG=3.16 30
246CM cG M$|a(K)exp=0.0061,|a(L1+L2)exp=0.0013, K:L1+L2= 0.019 {I13}:0.004 {I1}
246CM2cG (1976Ah03); |a(K)exp|<0.01 (1966Or01)
246CM G 833.5 1 5.0 3 E1 0.00601 8
246CMS G KC=0.00486 7$LC=0.000870 12$MC=0.0002088 29
246CMS G NC=5.70E-5 8$OC=1.443E-5 20$PC=2.79E-6 4$QC=1.876E-7 26
246CM2 G %IG=5.1 5
246CM cG M$|a(K)exp=0.0052 (1976Ah03); |a(K)exp 0.004 {I2} (1966Or01).
246CM L 1078.83 9 1-
246CM E 5.6 5 6.9 4
246CMS E CK=0.53 14$CL=0.33 9$CM+=0.13 5
246CM G 1036.0 1 1.75 13 E1 0.00412 6
246CMS G KC=0.00334 5$LC=0.000588 8$MC=0.0001409 20
246CMS G NC=3.84E-5 5$OC=9.75E-6 14$PC=1.893E-6 27$QC=1.306E-7 18
246CM2 G %IG=1.79 18
246CM cG M$|a(K)exp=0.0037 (1976Ah03); |a(K)exp|<0.003 (1966Or01).
246CM G 1078.8 1 3.7 3 E1 0.00385 5
246CMS G KC=0.00312 4$LC=0.000548 8$MC=0.0001311 18
246CMS G NC=3.58E-5 5$OC=9.07E-6 13$PC=1.764E-6 25$QC=1.222E-7 17
246CM2 G %IG=3.8 4
246CM cG M |a(K)exp=0.0041 (1976Ah03); |a(K)exp|<0.003 (1966Or01).
246CM L 1104.85 14 2-
246CM E 2.97 29 7.1 4
246CMS E CK=0.49 20$CL=0.36 13$CM+=0.15 7
246CM G 1062.0 1 2.9 2 E1 0.00395 6
246CMS G KC=0.00320 4$LC=0.000563 8$MC=0.0001348 19
246CMS G NC=3.68E-5 5$OC=9.33E-6 13$PC=1.813E-6 25$QC=1.254E-7 18
246CM2 G %IG=2.96 29
246CM cG M$|a(K)exp=0.0029 (1976Ah03); |a(K)exp|<0.003 (1966Or01).
246CM L 1124.28 9 2+
246CM E 10.8 9 6.4 5
246CMS E CK=0.4 3$CL=0.39 17$CM+=0.16 9
246CM G 982.2 2 0.22 2 [E2] 0.0142820
246CMS G KC=0.01042 15$LC=0.00287 4$MC=0.000727 10
246CMS G NC=0.0002001 28$OC=5.02E-5 7$PC=9.51E-6 13$QC=5.00E-7 7
246CM2 G %IG=0.224 26
246CM G 1081.4 1 5.8 4 E2 0.0119017
246CMS G KC=0.00884 12$LC=0.002286 32$MC=0.000575 8
246CMS G NC=0.0001581 22$OC=3.98E-5 6$PC=7.57E-6 11$QC=4.17E-7 6
246CM2 G %IG=5.9 6
246CM cG M$|a(K)exp=0.0093 (1976Ah03); |a(K)exp=0.008 {I3} (1966Or01);
246CM2cG K/L|?3.9 (1966Or01)
246CM G 1124.3 1 4.4 3 E2 0.0110715 D
246CMS G KC=0.00827 12$LC=0.002090 29$MC=0.000524 7
246CMS G NC=0.0001441 20$OC=3.63E-5 5$PC=6.92E-6 10$QC=3.88E-7 5
246CMS G IPC=2.328E-7 34
246CM2 G %IG=4.5 4
246CM cG M$|a(K)exp=0.0085, K:L1+L2=0.041 {I3}:0.0078 {I12} (1976Ah03).
246CM L 1128.09 123-
246CM E 0.27 5 8.0 5
246CMS E CK=0.4 3$CL=0.40 18$CM+=0.17 10
246CM G 986.03 4 0.26 3 (E1) 0.00449 6
246CM2 G %IG=0.27 4
246CM cG E,M$From Adopted Gammas
246CMS G KC=0.00364 5$LC=0.000642 9$MC=0.0001539 22
246CMS G NC=4.20E-5 6$OC=1.064E-5 15$PC=2.065E-6 29$QC=1.417E-7 20
246CM cG M$|a(K)exp|<0.008 (1966Or01).
246CM L 1165.49 11 3+
246CM E 0.55 11 7.4 6
246CMS E CK=0.3 3$CL=0.49 18$CM+=0.21 12
246CM G 1023.4 2 0.15 2 [E2] 0.0132118
246CMS G KC=0.00971 14$LC=0.00260 4$MC=0.000657 9
246CMS G NC=0.0001808 25$OC=4.54E-5 6$PC=8.62E-6 12$QC=4.63E-7 6
246CM2 G %IG=0.153 23
246CM G 1122.64 6 0.38 7 E2 0.0111016 D
246CMS G KC=0.00829 12$LC=0.002097 29$MC=0.000526 7
246CMS G NC=0.0001446 20$OC=3.64E-5 5$PC=6.94E-6 10$QC=3.89E-7 5
246CMS G IPC=2.167E-7 31
246CM2 G %IG=0.39 8
246CM cG E$From Adopted Gammas