248CM 252CF A DECAY 1970BA18 25NDS 202507
248CM H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 204, 374 (2025)$CUT=30-Jun-2024$
248CM dL E$Least-squares fitting is done by GLSC (version 30-Jun-2025)
248CM c 1990Po14: X-ray intensities measured from the |a decay of {+252}Cf
248CM2c using x ray spectrometer
248CM c 1971Wa28: Measured E|g, I|g, I(L x ray), E(L x ray) with high
248CM2c resolution Si(Li) spectrometer. Deduced L-subshell fluorescense yields
248CM c 1970To08: Measured E|g, T{-1/2} using |a-ce delayed-coincidence
248CM2c technique. Alphas were measured with a surface barrier detector and
248CM3c the ce were detected with a plastic scintillator-photomultiplier.
248CM c 1970Ba18: Measured E|a, I|a with double-focusing magnetic spectrograph
248CM c 1963Le17: Measured E|a, I|a using the fission anticoincidence
248CM2c technique. No photons with E|g>225 were observed:
248CM3c I|g(E|g>225)<0.002 per |a decays
248CM c 1963Bj03: Measured |a-|g and |a-electron coincidence.
248CM2c No photons with E|g>400 were observed: I(E|g>400)<0.002, and
248CM3c no electrons with E(ce)>400 were observed: I(E(ce)>400)<0.00006
248CM4c per 100 |a decays.
248CM c 1955As42: Measured alpha and gamma spectra with alpha-particle
248CM2c spectrograph and alpha-particle gamma coincidence counter.
248CM c Others: 1975AlYO
248CM cA HF$The nuclear radius parameter r{-0}({+248}Cm)=1.50109 {I20} is
248CM2cA deduced from assumed HF=1.0 for the ground-state to ground-state alpha
248CM3cA decay branch
248CM cA E$Except as noted, all energies are from the measurements of 1970Ba18;
248CM2cA the original energies are increased here by 1.6 keV by recalibrating
248CM3cA the energies at 6118.10 keV for the highest energy
248CM4cA |a (transition to the g.s. of {+248}Cm).
248CM cA E(B)$The energies of the 6118- and 6076-keV |a's are from
248CM2cA 1986Ry04. The original energies have been decreased by 0.14
248CM3cA and 0.13 keV, respectively, as recommended by 1991Ry01.
248CM cA IA$I|a values can be obtained from directly measured |a
248CM2cA intensities or from intensity balance arguments using the measured
248CM3cA I|g values and theoretical conversion coefficients.
248CM4cA Except for E|a=5826.3 keV, the evaluator has chosen the approach where
248CM5cA intensities with quoted uncertainties are available.
248CM cG $L x ray=7.8 {I4} per 100 |a decays (1971Wa28). See 1971Wa28 for
248CM2cG measured energies and intensities of L X-ray components and for
248CM3cG deduced L subshell-fluorescence yields. See also 1964Ha14 for
248CM4cG L fluorescence yield, obtained from L| x ray intensity in singles,
248CM5cG |g|g and |a|g spectra.
248CM cG $L x ray and M x ray radiations were observed by 1990Po14.
248CM cG $K x ray=0.007 per 100 |a decays (1955As42).
248CM cG M$From Adopted Gammas
248CM cL T$From Adopted Levels
248CM cL E$From least-squares fit to E|g data
248CM cL BAND(A)$K|p=0+ g.s. band
248CM DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
252CF P 0.0 0+ 2.647 Y 3 6216.95 4
252CF cP QP$From 2021Wa16
252CF cP T$From Adopted Levels in {+252}Cf (2021Ma19)
248CM N 1.0 0.96898 3
248CM cN BR$From Adopted Levels in {+252}Cf (2021Ma19)
248CM PN 5
248CM L 0.0 0+ 3.48E+5 Y 6 A
248CM A 6118.10 4 84.1 4 1.0 B
248CM cA IA$from 1976BaZZ. Others: 84.0 (1970Ba18), 84.5 (1955As42)
248CM L 43.399 25 2+ 122.5 PS 25 A
248CM cL T$from (|a)(ce)(t) (1970To08)
248CM A 6075.64 11 15.1 9 3.37 20 B
248CM cA IA$from an intensity balance at the 43 level. Measured values of
248CM2cA I|a are 15.5 (1955As42) and 15.8 (1970Ba18)
248CM G 43.399 25 0.0153 9 E2 1000 14
248CMS G LC=724 10$MC=203.9 29
248CMS G NC=56.7 8$OC=13.70 20$PC=2.238 32$QC=0.00553 8
248CM2 G %IG=0.0148 9
248CM cG E$from 1971Wa28. Others: 42 (1955As42), 43.4 {I1} (1956Ho54)
248CM cG RI$from (1971Wa28). Other: 0.014 (1955As42)
248CM L 143.6 4 4+ 80 PS +14-19 A
248CM A 5976.6 0.25 12 6E1 4
248CM cA IA$from an intensity balance at the 144 level. Measured values of
248CM2cA I|a are 0.28 (1958As64) and 0.2 (1970Ba18)
248CM G 100.2 4 0.013 6 E2 18.5 4
248CMS G LC=13.41 31$MC=3.79 9
248CMS G NC=1.054 25$OC=0.255 6$PC=0.0424 10$QC=0.000175 4
248CM2 G %IG=0.013 6
248CM cG E$from 1964As10
248CM cG RI$from 1955As42
248CM L 298.7 5 6+ 34 PS +11-3 A
248CM A 5826.3 0.0020 1.18E3
248CM cA IA,HF$the measured I|a value and that deduced from I|g are not
248CM2cA consistent. I|a=0.0020 (1970Ba18) whereas from I|g=0.0020 {I6}
248CM3cA (1963Le17) and |a, the requirement of an intensity balance
248CM4cA at the 298 level gives I|a=0.0074 {I22}. Conversely, from I|a, one
248CM5cA deduces I|g=0.00052. Note that HF=1180 for I|a=0.0020 and 320 {I110}
248CM6cA for I|a=0.0074 {I22}. Note further that 1963Le17 quote HF=1170 {I350},
248CM7cA so there is an inconsistency in 1963Le17. The evaluator adopts the
248CM8cA I|a value of 1970Ba18 and the I|g(155|g) value deduced from I|a
248CM G 155.1 2 0.00055 E2 2.71 4
248CMS G KC=0.1741 24$LC=1.837 28$MC=0.517 8
248CMS G NC=0.1440 22$OC=0.0350 5$PC=0.00589 9$QC=3.82E-5 6
248CM2 G %IG=5.3E-4
248CM cG E$From Adopted Gammas. E|g=160 keV {I15} is reported by 1963Le17 in |a
248CMxcG decay
248CM cG RI$see comment on I|a(5826|a)
248CM L 505.0 5 8+ 16.0 PS +31-23 A
248CM DL E LEVEL ENERGY HELD FIXED IN LEAST-SQUARES ADJUSTMENT
248CM A 5616.0 6E-5 AP 2.8E3 19
248CM cA IA$from 1970Ba18
248CM G 207.4 2 3E-5 AP E2 0.858 12 S
248CMS G KC=0.1394 20$LC=0.521 8$MC=0.1458 21
248CMS G NC=0.0405 6$OC=0.00987 14$PC=0.001683 25$QC=1.604E-5 23
248CM2 G %IG AP 2.91E-5
248CM cG E,RI$this transition is not seen in |a decay. E|g is from adopted
248CM2cG gammas, and I|g is from I(|g+ce)=I|a with |a as given