248BK 252ES A DECAY 1973FI06 25NDS 202507
248BK H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 204, 374 (2025)$CUT=30-Jun-2024$
248BK dA HF$Hindrance Factor is calculated by AlphaHF (version 10-Jan-2025)
248BK dL E$Least-squares fitting is done by GLSC (version 30-Jun-2025)
248BK c 1973Fi06: |a particles were detected with a Au-Si surface barrier
248BK2c detector and the photons were detected with a co-axial Ge(Li)
248BK3c detector. Coincidence measurements were performed with a semiconductor
248BK4c detector for alphas and a NaI(Tl) and Ge(Li) detectors for gammas.
248BK4c Measured T{-1/2}, E|a, I|a, E|g, I|g, |g|g-coin,
248BK5c and |a|g coin ratio. Deduced levels, J|p and multipolarity.
248BK c Other: 1965Mc11
248BK tG $x-rays measured by 1973Fi06:
248BK tG $
248BK tG $ E(x ray) I(per 100 |a decays)
248BK tG $ -------- -------------------
248BK tG $ 107.20 {I5} 0.37 {I3} Bk K|a{-2}| x ray
248BK tG $ 115.02 {I5} 0.58 {I5} Bk K|a{-1}| x ray
248BK tG $ 125.4 {I1} Bk K|b{-3} x ray
248BK tG $ 0.23 {I2}
248BK tG $ 126.5 {I1} Bk K|b{-1} x ray
248BK tG $ 130.7 {I2} 0.082 {I8} Bk K|b{-2}'| x ray
248BK tG $
248BK cG $|a|g, |g|g and |gce coincidences were measured by 1973Fi06. See
248BK2cG 1973Fi06 for data.
248BK cA HF$The nuclear radius parameter r{-0}({+248}Bk)=1.48487 {I52} is
248BK2cA deduced from interpolation of radius parameters of the adjacent
248BK3cA even-even nuclides in 2020Si16
248BK cA E$From 1973Fi06. The original energies are
248BK2cA increased by 1 keV, as recommended by 1991Ry01, due to changes in
248BK3cA calibration energies. No higher-energy |a's were observed.
248BK cA IA$I|a per 100 |a decays (1973Fi06)
248BK cG E$From 1973Fi06
248BK cG RI$I|g per 100 |a decays (1973Fi06)
248BK cG M$Except where noted otherwise, multipolarities are from K| x ray/|g in
248BK2cG coincidence with |a's (1973Fi06) (E2 admixtures to M1's are not ruled
248BK3cG out). These multipolarities are provided in the Adopted Gammas.
248BK cL E$From least-squares fit to E|g data by the evaluator, except as noted.
248BK DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
252ES P 0.0 (4+) 471.7 D 19 6738.6 5
252ES cP QP$From 2021Wa16
252ES cP T$From Adopted Levels in {+252}Es (2021Ma19)
252ES cP J$From K|p=4+,|p7/2[633]|n1/2[620] configuration and systematics.
252ES2cP Note in the current ENSDF database (15 April, 2025),
252ES4cP J|p({+252}Es)=(5-) (2021Ma19)
248BK N 1.0 0.78 2
248BK PN 2
248BK cN BR$From Adopted Levels in {+252}Cf (2021Ma19)
248BK G 52.33 5 0.72 6
248BK2 G %IG=0.56 5
248BK cG $The 52.33|g was observed in coincidence with the 6461|a;
248BK2cG therefore, it deexcites a level below the 171.5 level
248BK G 149.1 2 0.026 4
248BK2 G %IG=0.020 4
248BK G 230.9 4 0.032 6
248BK2 G %IG=0.025 +6-5
248BK G 326.0 4 0.031 6
248BK2 G %IG=0.024 +6-5
248BK G 428.3 5 0.012 AP
248BK2 G %IG AP 0.0094
248BK G 452.4 5 0.04 1
248BK2 G %IG=0.031 9
248BK G 523 1 0.016 AP
248BK2 G %IG AP 0.013
248BK G 548 AP 0.01 AP
248BK2 G %IG AP 0.0078
248BK L 0.0 (6+) 9 Y GT
248BK cL E$From E|a and Q(|a). 1973Fi06 assumed that the 6632|a feeds
248BK2cL the {+248}Bk g.s.
248BK A 6632 3 80.2 9 43.1 14
248BK cA $The 6632- and 6562-keV |a's are not seen in coincidence
248BK2cA with 80 to 400-keV |g's within the coincidence resolving time of
248BK3cA 100 ns (1973Fi06).
248BK L 70.64 5 (7+)
248BK A 6562 3 13.6 3 122 5
248BK G 70.65 5 0.16 2 M1+E2 3.4 21 98 24
248BK2 G %IG=0.125 19
248BK cG M,MR$the requirement of an intensity balance at the 70.6
248BK2cG level gives |a(70.65|g)=98 {I+23-17} from which one gets
248BK3cG mult(70.65|g)=M1+E2 with |d=3.4 {I21}
248BKS G LC=71 17$MC=20 5
248BKS G NC=5.6 14$OC=1.37 35$PC=0.23 5$QC=1.0E-3 9
248BK L 135.06 7 (8-)
248BK A 6498 5 0.31 4 2.7E3 5
248BK G 64.42 5 0.36 3 [E1] 0.450 6
248BKS G LC=0.336 5$MC=0.0843 12
248BKS G NC=0.02294 32$OC=0.00559 8$PC=0.000920 13$QC=3.14E-5 4
248BK2 G %IG=0.281 25
248BK L 145 3
248BK DL E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT
248BK L 151.32 8 (8+)
248BK A 6482 3 2.19 9 324 17
248BK G 80.7 1 0.042 7 M1+E2 1.3 +25-6 40 13
248BKS G LC=29 9$MC=8.1 27
248BKS G NC=2.3 8$OC=0.56 18$PC=0.095 28$QC=0.0013 7
248BK2 G %IG=0.033 +7-6
248BK cG M,MR$the requirement of an intensity balance at the 151.3
248BK2cG level gives |a(80.7|g)=41 {I+12-7} from which one gets
248BK3cG mult(80.7|g)=M1+E2 with |d=1.3 {I+25-6}
248BK G 151.3 1 0.096 9 [E2] 3.26 5
248BKS G KC=0.1614 23$LC=2.235 32$MC=0.633 9
248BKS G NC=0.1770 25$OC=0.0435 6$PC=0.00732 10$QC=4.63E-5 7
248BK2 G %IG=0.075 7
248BK L 171.5 8 (3+,4+,5+)
248BK A 6461 3 0.25 4 2.3E3 5
248BK L 179.5 4
248BK L 212.6 8 (3+,4+,5+)
248BK A 6424 5 0.45 5 8.1E2 12
248BK L 262 6
248BK A 6374 5 0.07 3 3.0E3 17
248BK L 339 6
248BK A 6298 5 0.04 AP 2.3E3 16
248BK L 373.0 4
248BK A 6265 3 0.75 7 84 8
248BK G 193.5 1 0.068 8 M1 5.33 7
248BK3 G FL=179.5
248BKS G KC=4.17 6$LC=0.869 12$MC=0.2130 30
248BKS G NC=0.0587 8$OC=0.01512 21$PC=0.00298 4$QC=0.0002092 29
248BK2 G %IG=0.053 8
248BK G 228.0 4 0.036 6 M1 3.36 5
248BK3 G FL=145
248BKS G KC=2.63 4$LC=0.547 8$MC=0.1339 20
248BKS G NC=0.0369 5$OC=0.00950 14$PC=0.001876 28$QC=0.0001313 20
248BK2 G %IG=0.028 +6-5
248BK L 399.7 3 (5+)
248BK A 6239 3 0.57 5 81 8
248BK G 399.7 3 0.30 3 M1 0.709 10
248BKS G KC=0.556 8$LC=0.1145 16$MC=0.0280 4
248BKS G NC=0.00772 11$OC=0.001987 28$PC=0.000392 6$QC=2.74E-5 4
248BK2 G %IG=0.235 30
248BK L 424 6
248BK A 6215 5 0.10 3 3.5E2 13
248BK L 458 6
248BK A 6181 5 0.08 3 3.0E2 14
248BK L 483 6
248BK A 6156 5 0.04 AP 4.5E2 32
248BK L 529.1 7
248BK A 6109 5 0.12 3 87 26
248BK G 529.1 7 0.07 1
248BK2 G %IG=0.055 +10-9
248BK L 590.0 7 (4+)
248BK A 6051 3 1.02 9 5.0 5
248BK G 377.4 3 0.16 2 M1 0.830 12
248BKS G KC=0.651 9$LC=0.1341 19$MC=0.0328 5
248BKS G NC=0.00905 13$OC=0.002328 33$PC=0.000459 7$QC=3.21E-5 5
248BK2 G %IG=0.125 19
248BK G 418.5 3 0.29 3 M1 0.625 9
248BKS G KC=0.491 7$LC=0.1009 14$MC=0.02468 35
248BKS G NC=0.00680 10$OC=0.001751 25$PC=0.000345 5$QC=2.413E-5 34
248BK2 G %IG=0.227 29
248BK G 590.0 7 0.11 1
248BK2 G %IG=0.086 8
248BK L 624 5 (7+)
248BK A 6017 4 0.12 3 28 9
248BK L 657 5
248BK A 5985 4 0.050 15 46 17
248BK L 700 5 (8+)
248BK A 5943 4 0.040 15 34 16