184TA 184HF B- DECAY 1973WA18 10NDS 201002
184TA H TYP=FUL$AUT=CORAL M. BAGLIN$CIT=NDS 111,275 (2010)$CUT=1-Oct-2009$
184TA c Source produced by {+186}W(p,3p), E(p)=92 (97% {+186}W target), 200 MeV
184TA2c ({+nat}W target); Ge(Li) detector (FWHM=1.2 at 122 keV, 1.9 keV at 1332
184TA3c keV), NaI detector, plastic scin (FWHM|?16%); chemically-separated
184TA4c source; measured E|g, I|g, |g|g coin, E|b, |b-|g coin.
184TA cB E From |b|g coincidence (plastic scintillator).
184TA cB IB Assuming I|b(228+453+617)=100 since negligible |b{+-} feeding
184TA2cB to 0, 48, 89 or 272 levels is expected.
184TA cG M From the intensity balance except where noted.
184TA cL E From E|g.
184TA cL J From Adopted Levels.
184TA cL E(A)$The order of 47.9|g, 41.4|g, and 139.1|g has not been established
184TA2cL experimentally so the energies of the 48 and 89 levels may differ
184TA3cL from those shown here.
184HF P 0.0 0+ 4.12 H 5 1340 30
184TA N 0.95 11 0.95 11 1.0 1.0
184TA cN NR 1973Wa18 report absolute abundances derived from the
184TA2cN growth and decay of the {+184}Ta daughter. The granddaughter abundances
184TA3cN were taken as I|g(111)=0.247 {I35}, I|g(253)=0.48 {I6}, and
184TA4cN I|g(414)=0.85 {I9}. These are from 4% - 18% higher than those adopted
184TA5cN here for {+184}Ta decay. The {+184}Ta half-life (8.55 h) used by
184TA6cN 1973Wa18 is about 2% lower than the value adopted in this evaluation.
184TA7cN The two discrepancies have opposing effects on the normalization
184TA8cN making the correction difficult. Multipolarities can be deduced for
184TA9cN E|g<150 transitions based on |a(exp) (or their limits) deduced using
184TABcN I(|g+ce) balance arguments, measured I(K| x ray) and the authors' I|g
184TACcN assuming none is M2 or higher. The decay scheme was then renormalized
184TADcN assuming 181|g and 345|g are E1, by requiring total I|b=100% and
184TAEcN constraining the feeding to g.s., 48, 89 and 272 levels to zero
184TAFcN (|DJ=(5) and (3), respectively, to g.s. and 48 level,
184TAGcN I|b{+-}(89)|<1.6% for log| {If{+1u}t}|>8.5, and |b{+-} feeding to the
184TAHcN 272 level should be highly hindered due to cancellation of matrix
184TAIcN elements for this proposed 0+ to (0-) transition (1973Wa18)). A less
184TAxcN precise normalization factor of 0.87 {I22} can be obtained from
184TAxcN |S(I(|g+ce) to g.s.)=100%.
184TA PN 3
184TA L 0.0 (5-)
184TA L 47.9 2 (3-) A
184TA G 47.9 2 1.2 3 E2 94.6 24
184TAS G LC=71.9 18$MC=18.0 5$NC+=4.74 12
184TAS G NC=4.19 11$OC=0.546 14$PC=0.000429 9
184TA cG M in the absence of |b{+-} feeding to the 48 level,
184TA2cG I(|g+ce)(48|g)=I(|g+ce)(41|g) and this implies multipolarities of E2
184TA3cG and M1, respectively, for the 48|g and 41|g.
184TA L 89.3 3 (2-) A
184TA B 1.6 LE 8.5 GE 1U?
184TA G 41.4 2 9.9 12 M1 9.71 20 C
184TAS G LC=7.52 16$MC=1.71 4$NC+=0.477 10
184TAS G NC=0.408 9$OC=0.0646 13$PC=0.00446 9
184TA cG M see comment on 48|g.
184TA L 228.4 4 1(-) A
184TA B 1100 30 47 12 6.57 12
184TAS B EAV=378 12
184TA G 139.1 2 48 4 M1+E2 1.9 +4-3 1.20 5 C
184TAS G KC=0.63 14$LC=0.42 4$MC=0.104 10$NC+=0.0278 24
184TAS G NC=0.0245 22$OC=0.00332 25$PC=5.0E-5 14
184TA cG M,MR from |a(K)exp=0.65 {I12}, calculated from I(K vacancies)=33
184TA2cG {I6} with the assumption that the 181|g and 345|g are E1.
184TA L 272.3 4 (0-)
184TA G 43.9 2 6.1 8 M1 8.17 16 C
184TAS G LC=6.33 13$MC=1.44 3$NC+=0.402 8
184TAS G NC=0.344 7$OC=0.0543 11$PC=0.00375 8
184TA cG M |a(exp)|>7.9 from I(|g+ce)(44|g)|>(I(|g+ce)(181|g)+I(|g+ce)(3
184TA2cG 44|g)) rules out E1 for 44|g; |a(exp)|<16.4 from
184TAxcG I(|g+ce)(44|g)|