81BR 81SE B- DECAY (18.5 M) 1969ZO06,1971DO09,2015KR0225NDS 202501
81BR H TYP=FUL$AUT=M. Shamsuzzoha Basunia$CIT=NDS 199, 271 (2025)$
81BR2 H CUT=1-Sep-2024$
81BR c Others: 1960Ku06, 1962Su07, 1963Ar01, 1967Pr06, 1967Yt03,
81BR2c 1969Ba34, 1969Be82, 1971Na18, 1974Ve12, 1974SaYH, 1977Kr18.
81BR c 1969Zo06: chemically separated Se from {+80}Se(n,|g) (99.87% {+80}Se);
81BR2c measured E|g, I|g with Ge(Li), FWHM=2.5 keV at E|g=1332, and |g|g coin
81BR2c with Ge(Li) and NaI, FWHM=7.0 keV at E|g=1332.
81BR c 1971Do09: source from {+82}Se(|g,n) (89.1% {+82}Se target); measured
81BR2c E|g, I|g, |g|g coin, |g(t); Ge(Li) (FWHM=3.6 keV at 1 MeV) and, for
81BR2c E|g<300, x-ray Ge(Li) spectrometer (FWHM=0.8 keV at 50 keV, 1.3 keV at
81BRxc 300 keV).
81BR c 2015Kr02: {+nat}Se targets were irradiated using rabbit system in the
81BR2c core of the Oregon State University TRIGA reactor. |g rays were
81BR3c detected with high-resolution Ge detectors (efficiency of 35% and
81BR4c FWHM=1.9 keV at 1332 keV). Measured E|g, I|g. Deduced
81BR5c levels, |b feedings and log {Ift} values.
81BR c 1974Ve12: source from {+80}Se(n,|g) E=thermal (96.87% {+80}Se target);
81BR2c measured E|g, I|g; Ge(Li) FWHM=4 keV at 662 keV. |DE(|g) not given;
81BR3c no isomeric assignment made for observed |g rays.
81BR dG CC$From BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
81BR DB B- EAV,LOGFT$FROM BetaShape v2.3.1 (Dec-2023) 2023MO21.
81SE P 0 1/2- 18.5 M 1 1588.0 14
81SE cP J,T from {+81}Se Adopted Levels
81SE cP QP$from 2021Wa16
81BR N 0.0067 5 0.0067 5 1.0 1.0
81BR PN 3
81BR cN NR using equation [8] of 2020Ba30 in transient equilibrium of
81BR2cN {+81m}Se (57.28 m {I2}) and {+81}Se (18.5 m {I1}), where I|g(103|g,
81BR3cN {+81}Se IT)/I(276|g, {+81}Br)=12.9 {I9} for {+81}Se source in transient
81BR4cN equilibrium (weighted average of 12.2 {I14} (using data in 1969Zo06)
81BR5cN and 13.6 {I15} (using data in 1971Do09)), and %I|g(102.968)=12.8 {I2}.
81BR dN $From data: in 1971Do09, I(103|g)/I(276|g)=100/(7.7 {I8} - 0.33 {I3})=
81BR2dN 13.6 {I15} and in 1969Zo06, 100/(8.8 {I9} - 0.59 {I6})=12.2 {I14}.
81BR3dN I(276|g) for g.s. is obtained from I(276|g) - I(260|g). %I|g(102.968)=
81BR4dN 100/(1+6.8 {I1})=12.8 {I2}.
81BR cL The adopted decay scheme is based on those from 1969Zo06 and
81BR2cL 1971Do09, with minor revisions by the evaluator. The tentative 815
81BR3cL level (deexcited by an 815|g) and the 1352 level (deexcited by 1352|g
81BR2cL and 787|g), proposed by 1974Ve12 without the benefit of coin
81BR3cL information, are not adopted by the evaluator. The 787|g presumably
81BR4cL corresponds to the weak lines reported at 789.2 {I5} and 787 {I2} by
81BR5cL 1971Do09 and 1969Zo06, respectively, and that E|g implies
81BR6cL E(level)=1354.5 {I5} which does not fit the 1352|g well. An E|g=789.6
81BR7cL {I7} line in (p,|g) is placed as the major branch from a 1327 level,
81BR8cL and the evaluator tentatively introduces this level into the decay
81BR9cL scheme to accommodate the 789.2|g of 1971Do09. The evaluator also
81BRacL tentatively introduces the known 1105 level (J|p=1/2-, 3/2-) to
81BRbcL accommodate the weak unplaced 1105 {I1} |g from 1971Do09. E|g=30
81BRccL reported in 1962Su07 is not confirmed in 1967Ra08.
81BR cL E From a least-squares fit to E|g.
81BR cL J,T From Adopted Levels.
81BR cG Authors, typically, have employed {+81}Se sources in which
81BR2cG the 57-min and 18-min isomers are in transient equilibrium, and quote
81BR3cG I|g relative to I|g=100 for the 103|g in {+81}Se (57 min) IT decay.
81BR4cG Following 1969Zo06 and 1971Do09, the evaluator has deduced I(276|g)
81BR5cG appropriate to {+81}Se (18 min) decay alone
81BR6cG using the measured I(276|g) for {+81}Se (57 min+18 min) decay
81BR7cG and I(260|g) (present in {+81}Se (57 min) decay only), assuming
81BR8cG |a(260|g)=0.0456 and |a(276|g)=0.008; I|g data from 1969Zo06, 1971Do09
81BR9cG and 1974Ve12 were then renormalized so I(276|g, 18-m Se)=100. These
81BRAcG data are then in excellent agreement among themselves and with I|g
81BRBcG obtained by 1969Zo06 by resolving the decay curve for each |g into its
81BRCcG two components.
81BR cG |a(K)exp, |a(L)exp data are from 1971Na18, measured with
81BR2cG Ge(Li) |g detector and Si(Li) electron spectrometer,
81BR2cG calibrated using transitions with well-known |a(K) and |a(L).
81BR cG |g|g(|q) data: for 290|g-276|g(|q), A{-2}=+0.050 {I35}
81BR2cG (1963Ar01), +0.052 {I20} (1969Be82) and A{-4}=+0.031 {I5} (1963Ar01),
81BR3cG +0.08 {I7} (1969Be82). Weighted averages of data are A{-2}=+0.052
81BR4cG {I17}, A{-4}=+0.031 {I5}; these allow |d(290|g) and |d(276|g) to be -8
81BR5cG {I+4-17} and +0.262 {I20}, or -0.262 {I20} and +8 {I+17-4}, or +0.258
81BR6cG {I23} and -7.5 {I+6-7}, or +7.5 {I+7-6} and -0.258 {I23}, none of
81BR7cG which is consistent with adopted values of +1.08 {I18} and -0.10 {I3},
81BRxcG respectively.
81BR cG E,RI Weighted average of available data as listed in comments,
81BR2cG except as noted. I|g is photon intensity relative to I(276|g, 18-m
81BR3cG {+81}Se)=100. Weak |g rays with E|g=375 (I|g=0.54 {I6}) and E|g=815
81BR4cG (I|g=0.11 {I6}) on the intensity scale used here are reported
81BR4cG by 1974Ve12 (isotopic assignment unknown) and tentatively placed from
81BR5cG 650 and 815 levels, respectively, but these gammas are absent in
81BR6cG both 1969Zo06 and 1971Do09, so are omitted here.
81BR cG M,MR From Adopted Gammas, except as noted.
81BR cG E(D),RI(D)$Doublet. I|g divided based on |g|g coin. Energy
81BR2cG separation of components is <0.7 keV
81BR3cG (1971Do09) so averaged energy of doublet (290.04 {I7}) is assigned to
81BR4cG the stronger component and E|g=290.0 {I7} (suggested by 1971Do09) to
81BR5cG the weaker one.
81BR cG E(F) Tentatively placed by evaluator by analogy with (p,|g);
81BR2cG placed by 1974Ve12 from a tentative 1352 level which
81BR3cG the evaluator does not adopt, but not placed by 1969Zo06, 1971Do09.
81BR4cG Isomeric assignment not established.
81BR cG E(H) Reported by 1974Ve12 only and placed from a 1352 level which
81BR2cG the evaluator does not adopt. This |g must be different from the
81BR3cG 1350|g deexciting the 1350-keV level in (n,n'|g),
81BR4cG because the stronger 327|g and 583|g which also deexcite that level
81BR5cG in (n,n'|g) are not seen by 1974Ve12. This |g may not belong to
81BR6cG {+81}Se |b{+-} decay.
81BR cB IB From total transition intensity balance at each level.
81BR2cB Values of 1967Ra08 are listed in comments, estimated from
81BR3cB measured I|g, the total number of 18-min {+81g}Se disintegrations was
81BR4cB obtained by using a total conversion coefficient of |a=7.07 for the
81BR5cB 102.7-keV isomeric transition, and a value of 0.68, from
81BR6cB [(T{-p}-T{-d})/T{-p}], for the ratio of {+81m}Se/{+81g}Se activities
81BR7cB at equilibrium.
81BR G 1352 0.21 7 H
81BR L 0 3/2-
81BR B 98.74 12 5.0283 29
81BRS B EAV=614.2 6
81BR cB E measured endpoint energy 1580 {I40}: weighted average of
81BR2cB 1560 {I50} (1960Ku06) and 1600 {I50} (1967Yt03).
81BR cB IB 100%-|S(I(|g+ce) to g.s.). Other: 98.5 {I1}% in 1967Ra08.
81BR L 275.986 95/2- 9.7 PS 14
81BR cL T 235 ps {I15} from 290|g-276|g(t) (1974SaYH). Inconsistent
81BR2cL with adopted value (9.7 ps {I14}) for reasons which are unknown.
81BR B 0.013 LE 9.3 GE
81BR cB IB$0.013 {I9} from |g transition intensity balance. The evaluator
81BR2cB proposed the limit for I{-|b}, since I|g(275.99|g) may contain
81BR3cB negligible intensity resulting from the feeding in {+81}Se |b- decay
81BR4cB (57.28 m).
81BRS B EAV=509.8 6
81BR G 275.990 10 100 1 M1+E2 -0.10 3 0.0081614 C
81BR3 G EKC=0.009 1$ELC=0.002 1
81BRS G KC=0.00724 13$LC=0.000781 14$MC=0.0001242 23
81BRS G NC=1.158E-5 21
81BR cG E weighted average of 275.94 {I5} (1969Zo06), 275.9 {I1}
81BR2cG (1971Do09), 275.6 {I3} (1969Ba34), 275.8 {I5} (1967Ra08), and 275.993
81BR3cG {I10} (2015Kr02).
81BR cG RI from 2015Kr02. Others: 100 (1969Zo06), 100 (1971Do09), 100
81BR2cG {I3} (1969Ba34 - rescaling 10.2 {I3}), 100 {I5} (1967Ra08 - rescaling
81BR3cG 10.2 {I5}).
81BR cG MR 0.45 {I+14-15} from |a(K)exp and |a(L)exp, but
81BR2cG datum probably too imprecise to be reliable.
81BR L 538.194 141/2-,3/2- 0.76 PS 3
81BR cL J proposed spin and parity 5/2- or 7/2- in 1967Ra08.
81BR B 0.032 7 7.80 9
81BRS B EAV=377.9 6
81BR G 538.189 14 7.18 7 M1+E2 0.087 15 1.63E-3 2 C
81BRS G KC=0.001454 20$LC=0.0001541 22$MC=2.448E-5 34
81BRS G NC=2.293E-6 32
81BR cG E weighted average of 538.2 {I1} (1969Zo06), 538.2 {I2}
81BR2cG (1971Do09), 538.0 {I4} (1969Ba34), 539.0 {I5} (1967Ra08),
81BR3cG 538.188 {I14} (2015Kr02), 538.2 {I1} (1977Kr18).
81BR cG RI from 2015Kr02. Others: 6.9 {I7} (1969Zo06), 7.7 {I8}
81BR2cG (1971Do09), 6.3 {I16} (1969Ba34 - rescaling 0.64 {I16}), 7.8 {I20}
81BR3cG (1967Ra08 - rescaling 0.8 {I2}), 7.3 {I4} (1977Kr18).
81BR L 566.125 113/2- 68 PS +32-18
81BR B 0.78 7 6.386 39 C
81BR cB IB other: 0.92 {I5}% in 1967Ra08.
81BRS B EAV=366.1 6
81BR cB E 1010 (1960Ku06).
81BR G 290.138 13 84.2 8 E2+M1 +1.11 22 0.0131 12 DC
81BR2 G A2=0.052 20 $ A4=0.08 7 (1970Be79)
81BR3 G EKC=0.012 1$ELC=0.002 1
81BRS G KC=0.0115 11$LC=0.00130 12$MC=0.000205 20
81BRS G NC=1.87E-5 17
81BR cG E weighted average of 290.08 {I5}(1969Zo06), 289.9 {I1}
81BR2cG (1971Do09), 290.141 {I10}(2015Kr02), 290.19 {I5} (1977Kr18), 289.9 {I5}
81BR3cG (1967Ra08), 289.9 {I3} (1969Ba34). In 1969Ba34, authors could not prove
81BR4cG it as doublet.
81BR cG RI weighted average of 82 {I8} (1969Zo06), 82 {I9} (1971Do09),
81BR2cG 84.3 {I8} (2015Kr02), 87 {I4} (1977Kr18), 85 {I4} (1967Ra08 - for both
81BR3cG placement - rescaling 8.7 {I4} ), 82 {I3} (1969Ba34 - rescaling 8.4
81BR4cG {I3}). In 1969Ba34, authors could not prove it as doublet.
81BR cG MR 1.23 {I22} from |a(K)exp, >0.64 from |a(L)exp.
81BR G 566.123 14 31.8 3 M1+E2 -3.0 5 0.00199 4
81BRS G KC=0.001763 32$LC=0.0001908 35$MC=3.03E-5 6
81BRS G NC=2.80E-6 5
81BR cG E weighted average of 566.04 {I5} (1969Zo06), 565.9 {I2}
81BR2cG (1971Do09), 566.0 {I4} (1969Ba34), 566.1 {I5} (1967Ra08), 566.131 {I14}
81BR4cG (2015Kr02), 566.11 {I7} (1977Kr18). Other: 552 and 560 (1962Su07).
81BR cG RI weighted average of 33.0 {I33} (1969Zo06), 32.5 {I50}
81BR2cG (1971Do09), 29.9 {I29} (1969Ba34 - rescaling 3.05 {I30}), 28.4 {I29}
81BR3cG (1967Ra08 - rescaling 2.9 {I3}), 31.8 {I3} (2015Kr02), 33.3 {I15}
81BR5cG (1977Kr18). Other: 37 {I8} for doublet 552 and 560 (1962Su07).
81BR L 650.003 16(3/2)- 2.6 PS 3
81BR B 0.0191 18 7.857 41
81BRS B EAV=330.8 6
81BR G 649.990 19 3.79 4 M1+E2 +0.111 7 1.07E-3 2 C
81BRS G KC=0.000950 13$LC=0.0001003 14$MC=1.593E-5 22
81BRS G NC=1.493E-6 21
81BR cG E weighted average of 649.8 {I1} (1969Zo06), 649.7 {I3}
81BR2cG (1971Do09), 649.996 {I14} (2015Kr02), 649.9 {I1} (1977Kr18).
81BR cG RI weighted average of 3.5 {I4} (1969Zo06), 4.0 {I4}
81BR2cG (1971Do09), 3.79 {I4} (2015Kr02), 4.00 {I35} (1977Kr18).
81BR L 828.434 153/2- 0.46 PS 7
81BR B 0.41 4 6.188 43
81BR cB IB other: 0.61 {I5}% in 1967Ra08.
81BRS B EAV=257.8 6
81BR G 178.416 24 0.92 4 (M1+E2) 0.28 LT 0.0274 31 C
81BR3 G EKC LT 0.05$ELC LT 0.003
81BRS G KC=0.0243 27$LC=0.00269 34$MC=0.00043 5
81BRS G NC=3.9E-5 5
81BR cG E weighted average of 178.3 {I1} (1969Zo06), 177.9 {I3}
81BR2cG (1971Do09), 178.424 {I20} (2015Kr02), 178.4 {I1} (1977Kr18).
81BR cG RI weighted average of 0.98 {I10} (1969Zo06),
81BR2cG 0.80 {I8} (1971Do09, recalculated by evaluator), 0.94
81BR3cG {I4} (2015Kr02), 0.93 {I6} (1977Kr18).
81BR cG M E1 or M1(+E2), based on |a(K)exp alone. If M1+E2, |d<0.28
81BR2cG from |a(L)exp, <0.84 from |a(K)exp.
81BR G 290.1 1 2.4 5 DC
81BR cG E weighted average of 290.1 {I1} (1969Zo06), 290.0 {I7}
81BR2cG (1971Do09), 289.9 {I3} (1969Ba34), 290.0 {I5}
81BR3cG (1977Kr18), 289.9 {I5} (1967Ra08).
81BR cG RI weighted average of 1.9 {I5} (1969Zo06), 2.5 {I5} (1971Do09),
81BR2cG 3.2 {I8} (1977Kr18).
81BR G 552.455 14 13.6 1 M1+E2 +0.32 20 0.00160 8 C
81BRS G KC=0.00142 7$LC=0.000151 8$MC=2.40E-5 13
81BRS G NC=2.24E-6 12
81BR cG E 552.4 {I1} (1969Zo06), 552.5 {I2} (1971Do09), 552.1 {I4}
81BR2cG (1969Ba34), 553.0 {I5} (1967Ra08), 552.456 {I14} (2015Kr02),
81BR4cG 552.44 {I8} (1977Kr18).
81BR cG RI weighted average of 12.5 {I12} (1969Zo06), 13.6 {I14}
81BR2cG (1971Do09), 13.2 {I20} (1969Ba34 - rescaling 1.35 {I20}), 14.7 {I29}
81BR3cG (1967Ra08 - rescaling 1.5 {I3}), 13.6 {I1} (2015Kr02), 13.6 {I9}
81BR4cG (1977Kr18).
81BR G 828.33 17 43.5 5 M1+E2 +0.18 3 6.29E-4 9
81BRS G KC=0.000560 8$LC=5.89E-5 8$MC=9.35E-6 13
81BRS G NC=8.77E-7 12
81BR cG E unweighted average of 828.27 {I5} (1969Zo06), 828.2 {I2}
81BR2cG (1971Do09), 827.7 {I3} (1969Ba34), 829.0 {I5} (1967Ra08), 828.432
81BR3cG {I14} (2015Kr02), and 828.37 {I15} (1977Kr18). Other: 832 (1962Su07).
81BR cG RI weighted average of 40.2 {I40} (1969Zo06), 43.9 {I44}
81BR2cG (1971Do09), 40 {I5} (1969Ba34 - rescaling 4.1 {I5}), 25 {I6}
81BR3cG (1962Su07), 48 {I5} (1967Ra08 - rescaling 4.9 {I5}), 43.6 {I4}
81BR4cG (2015Kr02), 44 {I2} (1977Kr18).
81BR L 835.5 5 7/2- 1.05 PS 7
81BR cL E level proposed in 1977Kr18. Absent in other references.
81BR G 835.5 5 0.11 5 E2 7.08E-410
81BRS G KC=0.000629 9$LC=6.70E-5 9$MC=1.063E-5 15
81BRS G NC=9.89E-7 14
81BR cG E,RI from 1977Kr18. Other: 835 {I2} - reported in 1969Zo06,
81BR2cG however, comparable 834.1|g was expected from contaminant {+83}Se, an
81BR3cG upper limit I|g <0.0003% was reported for this |g.
81BR L 1105 1 (1/2)- ?
81BR G 1105 1 D ?
81BR cG E weak |g, isomeric assignment not established (1971Do09);
81BR2cG placed by evaluator.
81BR L 1327.3 5 ?
81BR B 0.0025LE 6.8 GE ?
81BRS B EAV=74.46 48
81BR cB IB$0.0025 {I4} from |g transition intensity balance. The evaluator
81BR2cB proposed the limit for I{-|b}, since isomeric assignment of
81BR3cB I|g(789.1|g) was not determined in 1969Zo06. A comparable 789.254|g
81BR4cB also reported in {+81}Se |b- decay (57.28 m) from 2015Kr02.
81BR G 789.1 5 0.38 5 F ?
81BR cG E weighted average of 787 {I2} (1969Zo06), 789.2 {I5}
81BR2cG (1971Do09), 789.2 {I7} (1977Kr18 - not placed in the level scheme).
81BR cG RI weighted average of 0.4 {I1} (1969Zo06) and
81BR2cG 0.38 {I5} (1974Ve12 - rescaled I|g=0.039 {I5} (in level scheme)
81BR3cG relative to I|g(275.990)=100 instead of 10.23, I|g=0.930 {I5}
81BR4cG in Table I appears to be a misprint). Other: < 0.2 (2015Kr02).