87SR 87Y EC DECAY (79.8 H) 15NDS 201510
87SR H TYP=FUL$AUT=T.D. Johnson and W.D. Kulp(a)$CIT=NDS 129, 1 (2015)$
87SR2 H CUT=27-Jul-2015$
87SR c 1988AL01: Source preparation by {+87}Sr(p,n) with E{-p}=18 MeV.
87SR2c Measured precise E{-|g} and relative I{-|g}; deduced |e branching.
87SR c 1993Va03: Measured P{-K} to 873 level.
87SR c 1984Pr01: Measured parent T{-1/2} and relative I{-|g}.
87SR c 1971Ja24: Measured E{-|g} and I{-|g}.
87SR c 1970Kl02 and 1970Ca17: Measured |a{-K} for both |g's.
87SR c 1969Zo04: Measured parent T{-1/2} and I{-|g}.
87SR c 1969Cl11: Measured E{-|g}(388).
87SR c 1967Mi13: Measured parent T{-1/2} and |b{++} spectrum.
87SR c 1963Gr41: Measured K/L for 388 |g.
87SR cL Note that the level at 388 keV decays 99.70 {I 8}% by
87SR2cL an isomeric transition to the ground state and 0.30 {I 8}%
87SR3cL by |e+|b+ decay to {+87}Rb.
87SR cE The decay to the {+87}Sr ground state is unique third
87SR2cE forbidden for which the log{Ift} is expected to be about 21
87SR3cE (1998Si17) with a corresponding I{-|e+|b+} of 1.0x10{+-13}%.
87SR cL E From |g energies
87SR cL J From {+87}Sr Adopted Levels
87SR cG E From 1988Al01, on a scale where the strong {+198}Au line
87SR2cG has E{-|g}=411.8044 keV; if the energies of the reference lines
87SR3cG are adjusted to those of the evaluation of 2000He14, the 388
87SR4cG and 484 energies would be lower by 4 and 3 eV, respectively.
87SR cG E(A) The authors' value has been corrected for the
87SR2cG reference data in 200He14
87SR cG RI Due to the significant half-life of the 388-keV level, the
87SR2cG measured relative intensity of the two |g rays will vary with
87SR3cG time and the secular equilibrium ratio is 1.0352 {I 2} times the
87SR4cG relative intensity.
87SR cG M,MR From |a{-K}(exp).
87SR cG EKC are weighted average of values from 1970Kl02 and 1961Hu12,
87SR2cG normalized to the 661 |g from the decay of {+137}Cs. Other:
87SR3cG 1970Ca17.
87SR DG CC$FROM BrIcc v2.3a (30-Jun-2013) 2008Ki07, "Frozen Orbitals" appr.
87SR N 0.822 7 1.00 1.00
87SR cN NR from the intensity of the 484 |g, the normalization factor
87SR2cN is 93.4 / (113.3 x 1.0029), where the 113.3 would be the relative
87SR3cN intensity of the 484 |g if the half-life of the 388 level were
87SR4cN insignificant.
87SR PN 3
87Y P 0.0 1/2- 79.8 H 3 1861.7 11
87SR L 0.0 9/2+
87SR L 388.5276 231/2- 2.815 H 12 M1
87SR cL T from {+87m}Sr decay.
87SR E 0.18 2 6.4 4 6.96 5 6.6 7
87SRS E EAV=200.41 47$CK=0.8499 3$CL=0.10056 3$CM+=0.021952 6
87SR G 388.5276 23100 M4 0.213 A
87SR3 G EKC=0.168 8
87SRS G KC=0.181 3$LC=0.0266 4$MC=0.00456 7
87SRS G NC=0.000557 8$OC=3.13E-5 5
87SR L 873.338 6 3/2-
87SR E 93.4 4 5.444 4
87SRS E CK=0.8729$CL=0.1043$CM+=0.02279
87SR cE IE from from analysis of |g data (1988Al01); others: 97 from |g
87SR2cE data (1971Ja24), 87.4 from decomposition of |b{++} spectrum
87SR3cE (1967Mi13). From the analysis of 1988Al01, the authors used
87SR4cE %IT(388 level) = 99.70 {I 8}, I|g(484|g)/I|g(388|g)=1.093 {I 5},
87SR5cE |a(388|g)=0.212 {I 2}, |a(484|g)=0.00298, T1/2({+87}Y)=79.8 h
87SR6cE {I 3} and T1/2({+87m}Sr=2.81 h {I 1}, all consistent with the
87SR7cE present adopted values for these quantities.
87SR cE The measured P{-K}=0.91 {I5} (1993Va03), which agrees with
87SR2cE the theoretical value of 0.873.
87SR G 484.805 5 109.3 5 M1(+E2) 0.6 LT 0.0029817 A
87SR3 G EKC=0.00260 11
87SRS G KC=0.00264 15$LC=0.000290 18$MC=4.9E-5 3
87SRS G NC=6.1E-6 4$OC=3.95E-7 20
87SR cG RI weighted average of 108.7 11 (1969Zo04), 110.0 5 (1984Pr01),
87SR2cG and 108.8 5 (1988Al01); average gives a reduced-|h{+2}=1.62
87SR3cG and the external uncertainty has been adopted. This is the
87SR4cG measured value at secular equilibrium, which is 0.966 times
87SR5cG the value that would be observed if the 388 level had an
87SR6cG insignificant half-life.