252CF 252ES EC DECAY 1973Fi06 21NDS 202103
252CF H TYP=FUL$AUT=A.M. MATTERA, S. ZHU, A.B. HAYES, E.A. MCCUTCHAN$
252CF2 H CIT=NDS 172, 543 (2021)$CUT=1-Jan-2021$
252CF c 1973Fi06: {+252}Es was produced in reactions of {+252}Cf(d,2n) or
252CF2c {+249}Bk(|a,n) at the Argonne 152-cm cyclotron, and was chemically
252CF3c separated from the targets and other reaction products. Detectors:
252CF4c Ge(Li) with Be window, Si(Li) and NaI(Tl); Measured T{-1/2}, E{-|a},
252CF5c I{-|a}, E{-|g}, I{-|g}, I{-ce}, |g|g, |gce, |a/EC ratio.
252CF c x-ray energies (1973Fi06): E(K|a{-2})=109.82 keV {I5};
252CF2c E(K|a{-1})=115.02 keV {I5}; E(K|b{-3})=128.58 keV {I10};
252CF3c E(K|b{-1})=129.82 keV {I10}; E(K|b{-2}+K|b{-4})=133.60 keV {I10};
252CF4c E(KO{-2}+KO{-3})=134.76 keV {I10}.
252CF c x-ray intensities per 100 |e decays (1973Fi06): I(K|a{-2})=13.4
252CF2c {I10}; I(K|a{-1})=20.5 {I14}; I(K|b{-1,3})=8.4 {I7};
252CF3c I(K|b{-2,4}+KO{-2,3})=2.9 {I3}.
252CF cL E$From a least-squares fit to E|g, by evaluators.
252CF cL J,T$From the Adopted Levels.
252CF cG RI$Photon intensities per 100 |e decays, obtained in 1973Fi06 by
252CF2cG normalizing the total |g-ray and conversion electron intensities of
252CF3cG the high energy transitions populating the ground-state band to 100%
252CF4cG with the ce cofficients from 1968Ha53 assuming no direct |e branch to
252CF5cG the g.s. band is expected.
252CF cG M$From the Adopted Gammas unless otherwise noted.
252CF cE $1973Fi06 assign 100% |e feeding to the 969.8 level. An intensity
252CF2cE balance indicates small feeding to the (3+), 845.7-keV level, (4+),
252CF3cE 900.3-keV level and (4-), 917.0-keV level, and is adopted here.
252CF cG E,RI$From 1973Fi06.
252CF D CC$FROM BrIcc v2.3d (03-Apr-2019) 2008Ki07, "Frozen Orbitals" appr.
252ES P 0.0 (5-) 471.7 D 19 1.26E+3 5
252CF N 1.0 0.22 2 4.55
252CF L 0.0 0+
252CF L 45.72 5 2+ 92 PS 6
252CF G 45.72 5 0.10 1 E2 9.2E2 5
252CFS G LC=661 34$MC=188 10$NC=52.9 27$OC=13.1 7$PC=2.05 10$QC=0.00469 21
252CF cG M$from |a(M)exp=240, |a(N+O+...)=70 with uncertainties better than
252CF2cG 15% (1973Fi06).
252CF L 151.73 6 4+
252CF G 106.02 5 0.53 5 E2 16.97 25
252CFS G LC=12.22 18$MC=3.49 5$NC=0.981 14$OC=0.243 4$PC=0.0389 6$
252CFS G QC=0.0001510 22
252CF cG M$from |a(L2)exp=7.2, |a(L3)exp=3.8 with uncertainties better than
252CF2cG 15% (1973Fi06).
252CF L 804.82 7 (2+)
252CF G 759.1 1 1.96 14 [E2] 0.02657
252CFS G KC=0.0177 4$LC=0.00648 20$MC=0.00169 5$NC=0.000470 15$OC=0.000120 4$
252CFS G PC=2.17E-5 7$QC=7.86E-7 19
252CF G 804.8 1 1.5 1 [E2] 0.02366
252CFS G KC=0.01606 35$LC=0.00555 17$MC=0.00144 4$NC=0.000400 12$
252CFS G OC=0.0001020 31$PC=1.86E-5 6$QC=7.01E-7 17
252CF L 830.81 7 (2-)
252CF G 785.1 1 70 4 [E1] 0.0071916
252CFS G KC=0.00577 13$LC=0.001066 25$MC=0.000257 6$NC=7.08E-5 17$OC=1.82E-5 4$
252CFS G PC=3.45E-6 8$QC=1.88E-7 4
252CF L 845.72 9 (3+)
252CF G 694.0 1 1.76 12
252CF G 800.0 1 5.7 4
252CF E 1.64 2110.1 3 1.64 21 1U
252CFS E CK=0.43 7$CL=0.40 5$CM+=0.174 25
252CF L 867.51 7 (3-)
252CF G 715.8 1 3.30 23 [E1] 0.0084719
252CFS G KC=0.00678 15$LC=0.001265 30$MC=0.000306 7$NC=8.42E-5 20$OC=2.17E-5 5$
252CFS G PC=4.08E-6 9$QC=2.20E-7 5
252CF G 821.8 1 1.33 10 [E1] 0.0066415
252CFS G KC=0.00534 12$LC=0.000981 23$MC=0.000237 6$NC=6.51E-5 15$OC=1.68E-5 4$
252CFS G PC=3.18E-6 7$QC=1.75E-7 4
252CF L 900.29 25 (4+)
252CF G 748.6 3 0.29 5 [E2] 0.02737
252CFS G KC=0.0181 4$LC=0.00673 21$MC=0.00176 6$NC=0.000489 15$OC=0.000124 4$
252CFS G PC=2.26E-5 7$QC=8.07E-7 20
252CF G 854.5 4 0.13 3 [E2] 0.02095
252CFS G KC=0.01452 32$LC=0.00475 14$MC=0.00122 4$NC=0.000341 10$OC=8.69E-5 26$
252CFS G PC=1.59E-5 5$QC=6.24E-7 15
252CF E 0.095 1711.54 21 0.095 17
252CFS E CK=0.60 5$CL=0.29 3$CM+=0.114 15
252CF L 917.03 12 (4-)
252CF G 765.3 1 0.70 6 [E1] 0.0075217
252CFS G KC=0.00604 14$LC=0.001118 26$MC=0.000270 6$NC=7.43E-5 17$OC=1.91E-5 4$
252CFS G PC=3.61E-6 8$QC=1.97E-7 4
252CF E 0.16 2 11.25 21 0.16 2
252CFS E CK=0.59 6$CL=0.30 4$CM+=0.118 18
252CF L 969.83 6 (3+)
252CF G 102.33 5 7.2 5 [E1] 0.139420
252CFS G LC=0.1042 15$MC=0.0260 4$NC=0.00711 10$OC=0.001772 25$PC=0.000296 4$
252CFS G QC=1.003E-5 14
252CF G 139.03 5 53 4 E1 0.250235
252CFS G KC=0.1862 26$LC=0.0479 7$MC=0.01186 17$NC=0.00326 5$OC=0.000817 12$
252CFS G PC=0.0001406 20$QC=5.25E-6 7
252CF cG M$from |a(L1+L2)exp=0.03 with uncertainty better than 15% (1973Fi06).
252CF G 165.0 1 0.55 6 M1 9.89
252CFS G KC=7.70$LC=1.634$MC=0.404$NC+=0.156
252CF cG M,MR$M1 with |d=0.0 {I23} from |a(L1+L2)exp=2.2 with uncertainty
252CF2cG better than 15% (1973Fi06).
252CF G 818.1 1 2.85 22
252CF G 924.1 1 9.2 6
252CF E 20 3 8.3 4 20 3 1U
252CFS E CK=0.22 12$CL=0.53 7$CM+=0.25 5
252CF cE E$in 1973Fi06, the |e decay energy to the 969.8-keV level was deduced
252CF2cE to be 320 keV {I30} based on |e(K)/|e=0.45 {I10}. From the
252CF3cE recommended value of Q(|e)=1260 keV {I50} by 2017Wa10, the |e decay
252CF4cE energy to this level is 290 keV {I50}.