90ZR    90Y B- DECAY (64.05 H)        1976GR16,1990ZH20         20NDS    202005
 90ZR  H TYP=FUL$AUT=S. K. Basu, E.A. MCCUTCHAN$CIT=NDS 165, 1 (2020)$
 90ZR2 H CUT=1-Mar-2020$
 90ZR c  1976Gr16: Y(n,|g), chemical separation. 4|p|b-counting, |g(t) with
 90ZR2c  Ge(Li).
 90ZR c  1990Zh20: {+90}Sr source with {+90}Y in equilibrium. Measured I|g with
 90ZR2c  HPGe detector in low-background setup.
 90ZR c  For relative measurement of the longitudinal electron polarization,
 90ZR2c  see 1971Jo17.
 90ZR c  For studies of shape factors, see 1964Da16, 1966Ri01, 1971Na09,
 90ZR2c  1975Fl07, 1983Ha35, 2005Gr41
 90ZR c  For measurements of |b{+-} using liquid scintillator detectors see
 90ZR2c  1993Gr09, 1993Gr18, 1994Gr21, 1994Gr30, 1995Gr04, 2005Gr41; using
 90ZR3c  solid scintillator detectors, see 1993Va11, 1993Ya17, 1994Us01,
 90ZR4c  1994Sz09; detecting Cerenkov radiation, see 1994Br45,1995Ra27; using
 90ZR5c  gas-flow proportional counters, see 1996Be48; using photomultipliers,
 90ZR6c  see 1992Bo35; using ion-chambers, see 1996Wo08.
 90ZR cG $Probability of two-photon decay for 1760.7, 0+ to 0+ transition is
 90ZR2cG 0.040% {I5}, weighted av of 0.051% {I25} (1973Na01), 0.0317% {I77}
 90ZR3cG (1973As04), 0.039% {I12} (1989Mu12), and 0.052% {I10} (1993Ba65).
 90ZR4cG Others: 1961La07, 1970Ha27, 1970Va09.
 90ZR cG $Probability of one-photon E0 transition for 1760.7 relative to
 90ZR2cG internal conversion is 5|*10{+-7} {I2} (1990Zh20). Probability of
 90ZR3cG two-photon E0 transition relative to internal pair conversion is
 90ZR4cG 7.4|*10{+-4} {I14} (1993Ba65).
 90ZR cG E,M$From the Adopted Gammas.
 90ZR cL E,J$From the Adopted Levels.
 90ZR D  CC$FROM BrIcc v2.3a (30-Jun-2013) 2008Ki07, "Frozen Orbitals" appr.
 90Y   P 0            2-                64.05 H   5              2278.5   16
 90ZR  N 1.0          1.0       1.0       1.0
 90ZR PN                                                                     3
 90ZR  L 0            0+                STABLE
 90ZR  B             99.9885 14          9.2240  23                          1U
 90ZRS B EAV=932.40 73
 90ZR cB $Measured |b{+-} endpoint energies: 2265 keV {I5} (1957Yu06); 2261
 90ZR2cB keV {I3} (1958Jo33); 2271 keV {I2} (1961Ni02); 2268 keV {I2}
 90ZR3cB (1964An12); 2273 keV {I5} (1964La13); 2284 keV {I5} (1964Da16); 2275
 90ZR4cB keV {I5} (1966Ha15); 2280 keV {I5} (1966Ri01); 2275 keV {I3}
 90ZR5cB (1993Gr17).
 90ZR  L 1760.74   14 0+
 90ZR  G 1760.70   20           E0                               0.0115   14
 90ZRX G K/T=0.89 1$L/T=0.11 1
 90ZR cG TI$derived from I|b{+-} to this level, see comment on I|b{+-}
 90ZR cG $Probability of one-phonon E0 transition relative to internal
 90ZR2cG conversion is 5|*10{+-7} {I2} (1990Zh20)
 90ZR cG $internal pair production of 1760.7 E0 transition, branching
 90ZR2cG ratio=0.00320 {I15} pairs/100 decays (2020Pi01), 0.00326 {I4}
 90ZR3cG pairs/100 decays (2020Dr01), 0.003186 {I47} pairs/100 decays
 90ZR4cG (2007Se01).
 90ZR  B             0.0115  14          9.64    6                           1U
 90ZRS B EAV=184.59 61
 90ZR cB IB$From measured I(|g{+|+})/I(|b{+-})=0.000034 {I4} (1961La07) and
 90ZR2cB I(ce)/I(|g{+|+})=2.38 {I8} (1962Ne02).
 90ZR  L 2186.273  14 2+
 90ZR  G 2186.242  25 1.4E-6 3  E2                     5.36E-4
 90ZRS G KC=0.0001223 18$LC=1.325E-5 19$MC=2.29E-6 4$NC=3.27E-7 5$OC=2.34E-8 4
 90ZR cG RI$From absolute counting (1976Gr16). Other: 1.12|*10{+-6} {I6} from
 90ZR2cG measurement of activity in equilibrium with a {+90}Sr source
 90ZR3cG (1990Zh20). The method of normalization of 1990Zh20 is however not
 90ZR4cG described.
 90ZR  B             1.4E-6  3           11.04   10
 90ZRS B EAV=24.23 45
 90ZR cB IB$From measured intensity of 2186|g (1976Gr16).