138CS    138CS IT DECAY (2.91 M)       1971CA21,1978AU08         17NDS    201711
138CS  H TYP=FUL$AUT=JUN CHEN$CIT=NDS 146, 1 (2017)$CUT=30-Sep-2017$
138CS c  1971Ca21: source of {+138}Cs was produced via the thermal-neutron
138CS2c  induced fissions of {+235}U and also the {+138}Ba(n,p) reaction,
138CS3c  at CEN, Grenoble. |g and x rays were detected with Ge(Li) detectors
138CS4c  (FWHM=1.2 keV at 122 keV, 3-4 keV at 1333 keV) and NaI(Tl) detectors;
138CS5c  |b particles and conversion electrons were detected by a |b detector.
138CS6c  Measured E|g, I|g, E|b, |b|g-coin, |g|g-coin, |b|g(t). Deduced levels,
138CS7c  J, |p, half-life, decay branching, conversion coefficient, |g-ray
138CS8c  multipolarity. Systematics of neighboring isotones.
138CS c  1978Au08: source of {+138}Cs was produced via the spontaneous fission
138CS2c  of {+252}Cf. |g rays were detected with a Ge(Li) detector (FWHM=2 keV
138CS3c  at 1333 keV). Measured E|g, I|g. Deduced levels, decay branching.
138CS d  1971Ca21 supersede 1970Ca26
138CS c  Other: 1997Gr09
138CS cL J,T$From Adopted Levels
138CS  P 79.9      3 6-                2.91 M    10
138CS  N 0.00467     1.2346     0.81   3
138CS cN NR$from %I(|g+ce)(79.9|g)=81 {I3} per 100 parent decays and
138CS2cN |a(total)=213 (from BrIcc)
138CS PN             1.0                                                     3
138CS  L 0.0         3-                32.5 M    2
138CS  L 79.9      3 6-                2.91 M    10                          M
138CS2 L %IT=81 3
138CS cL $%IT is the weighted average of 81.5 {I+25-30} (at 68.3% confidence
138CS2cL level) from 1978Au08 and 75 {I8} from 1971Ca21, deduced from growth
138CS3cL curves of 463|g, 1436|g, and 1010|g. Other: %IT=81.5 {I+50-140} from
138CS4cL 1978Au08 at 99.7% confidence level. The 1010|g is not fed in |b{+-}
138CS5cL decay of 2.9-min {+138}Cs, but follows the |b{+-} decay of the {+138}Cs
138CS6cL ground state (1978Au08,1971Ca21).
138CS  G 79.9      3 100        (M3)                     213    81        3
138CSS G K/T=0.558$L/T=0.337$M/T=0.0780$N/T=0.0222
138CS cG E$1971Ca21 assign 79.9|g as the isomeric transition on the basis that
138CS2cG it is the only |g seen in {+138}Cs (2.91 min) decay and not seen in the
138CS3cG decay of {+138}Cs g.s.
138CS cG RI$1971Ca21 measure I|g(79.9|g)/I|g(1436|g in {+138}Ba)=0.020 {I5}
138CS cG M$T{-1/2}=2.91 min requires Mult=M3 or E3 if the 79.9|g is the isomeric
138CS2cG transition; M3 (|a(K)=119, calculated using the BrIcc program) would
138CS3cG account for observed K x-ray intensity whereas E3 (|a(K)=12.5 from
138CS4cG BrIcc) would not (1971Ca21).