81BR 81SE B- DECAY (57.28 M) 1969ZO06,1971DO09 25NDS 202501
81BR H TYP=FUL$AUT=M. Shamsuzzoha Basunia$CIT=NDS 199, 271 (2025)$
81BR2 H CUT=1-Sep-2024$
81BR c Others: 1969Be82, 1967Pr06, 1967Yt03, 1971Na18, 1974Ve12, 1977Kr18,
81BR2c 2015Kr02.
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
81BR3c E|g<300, x-ray Ge(Li) spectrometer (FWHM=0.8 keV at 50 keV, 1.3 keV at
81BRxc 300 keV).
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.
81BR3c |DE(|g) not given; no isomeric assignment made for observed |g rays.
81BR dG CC$From BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
81BR cG E,RI Weighted average of data from 1969Zo06 and 1971Do09, unless
81BR2cG noted otherwise. Intensities are from mixed source in transient
81BR3cG equilibrium, and are relative to I(102.968|g, {+81}Se IT)=100.
81BR4cG The listed |g-ray intensities are for this decay mode only.
81BR cG E(E),RI(E)$From 1974Ve12; this |g was placed by 1974Ve12 between
81BR2cG the known 768 and 567 levels on the basis of E|g alone. However,
81BR3cG since it is much more intense than the observed 767|g and since
81BR4cG other authors who observe the 768 level do not report a 201|g, the
81BR5cG evaluator considers this placement of the 201|g to be incorrect
81BR6cG and suspects the 201|g was wrongly assigned to {+81}Se |e decay.
81BR cG E(F),RI(F)$E|g from Adopted Gammas. Weak 492|g seen in coin spectrum
81BR2cG only; I|g=0.0010 {I2} (1969Zo06), deduced from both |g|g coin in
81BR3cG 1969Zo06 and 2422|g:767|g branching from the literature. The 492|g is
81BR4cG known from other reactions, the evaluator deduced the I|g shown
81BR5cG here from I|g(492|g)/I|g(767|g)=0.153 {I12} (from Adopted Gammas)
81BR6cG and I|g(767|g) from 1969Zo06.
81BR cG RI(B) Deduced by evaluator from I(260|g) and I(491|g?) assuming
81BR2cG |a(260|g)=0.0456, |a(276|g)=0.0082, and no |b{+-} feeding of the 275
81BR3cG level. This |g must follow the 260|g and 491|g(?) to deexcite the
81BR4cG 276-keV level following {+81}Se (57.28 min)
81BR5cG |b{+-} decay; however, the observed I(276|g) included the (large)
81BR6cG contribution from {+81}Se (18.45 min) |b{+-} decay created in the
81BR7cG source following {+81}Se (57 min) IT decay.
81BR cG RI(D) Unweighted average of 0.59 {I6} (1969Zo06), 0.33 {I3}
81BR2cG (1971Do09), and 0.73 {I2} (estimated value from 0.81 {I2} - authors
81BR3cG in 2015Kr02 note |?10% contribution from 260.584|g {+83}Se).
81BR4cG Other: 0.84 {I7} (1974Ve12); possibly somewhat overestimated as
81BR5cG a result of I(102.968|g, {+81}Se IT) being underestimated, since I|g
81BR6cG data for {+81}Se (18 min) relative to I(102.968|g, {+81}Se IT) are
81BR7cG consistently |?20% higher than in 1969Zo06 and 1971Do09. Weighted and
81BR8cG unweighted averages of all four is same and I|g(260|g)=0.62 {I11}.
81BR cG RI(G) From 1969Zo06. |g observed, but not placed by 1971Do09,
81BR2cG and intensity was not determined in that (1971Do09) study.
81BR cG M,MR From Adopted Gammas, except as noted.
81BR cG |a(K)exp,|a(L)exp: from 1971Na18, measured with Ge(Li)-|g-ray
81BR2cG and Si(Li)-electron spectrometer calibrated using transitions with
81BR3cG well-known |a(K) and |a(L). Data for transitions present in {+81}Se
81BR4cG |b{+-} decay (18.45 min) are listed with that decay only.
81BR cL E From a least-squares fit to E|g.
81BR cL J,T From Adopted Levels.
81BR DB B- EAV,LOGFT$FROM BetaShape v2.3.1 (Dec-2023) 2023MO21.
81SE P 102.968 10 7/2+ 57.28 M 2 1588.0 14
81SE cP E,J,T from {+81}Se Adopted Levels
81SE cP QP$from 2021Wa16
81BR N 147 26 0.00087 15 1149
81BR PN 3
81BR cN NR from I(|g+ce) to (g.s.)=100 (assuming no |b{+-} feeding of
81BR2cN g.s. or 275.93 level) and decay mode branching.
81BR cN BR from {+81}Se(IT branching + |b- decay mode branching)=100
81BR2cN using IT I|g(1+|a)=100 |* (1+6.80 {I10})=780 {I10} and I|g(1+|a) to
81BR3cN g.s. feeding=0.68 {I12}.
81BR G 201 0.030 4 E
81BR2 G %IG=0.0038 11
81BR L 0 3/2-
81BR L 275.93 5 5/2- 9.7 PS 14
81BR G 275.93 5 0.58 12M1+E2 -0.10 3 0.0081615 BC
81BRS G KC=0.00725 13$LC=0.000782 14$MC=0.0001242 23
81BRS G NC=1.159E-5 21
81BR2 G %IG=0.075 24
81BR cG E weighted average of 275.94 {I5} (1969Zo06) and 275.9 {I1}
81BR2cG (1971Do09).
81BR L 536.24 6 9/2+ 36 US 3 M
81BR B 0.074 24 8.10 16
81BRS B EAV=422.8 6
81BR G 260.305 12 0.55 12M2 0.0454 6 DC
81BR3 G EKC=0.038 1$ELC=0.005 2$
81BRS G KC=0.0399 6$LC=0.00468 7$MC=0.000749 10
81BRS G NC=6.92E-5 10
81BR2 G %IG=0.074 24
81BR cG E weighted average of 260.2 {I2} (1969Zo06), 260.0 {I2}
81BR2cG (1971Do09), 260.306 {I10} (2015Kr02).
81BR cG M from |a(K)exp, |a(L)exp (1971Na18).
81BR L 767.0 5(5/2)- 0.54 PS 4
81BR B 0.00070 19 9.76 14
81BRS B EAV=325.0 6
81BR G 491.3 0.0007 1 M1+E2 +0.25 13 0.00208 8 F
81BRS G KC=0.00184 7$LC=0.000196 8$MC=3.12E-5 13
81BRS G NC=2.92E-6 12
81BR2 G %IG=9.0E-5 26
81BR G 766.9 5 0.0048 5 M1+E2 -0.263 11 7.49E-411 G
81BRS G KC=0.000666 9$LC=7.02E-5 10$MC=1.114E-5 16
81BRS G NC=1.045E-6 15
81BR2 G %IG=0.00061 17
81BR cG E weighted average of 767.3 {I10} (1969Zo06), 767.0 {I5}
81BR2cG (1971Do09), 766.6 {I5} (1977Kr18 - shown for {+81g}Se decay with
81BR3cG I|g=0.15).
81BR L 789.258 19 5/2+
81BR B 0.012 3 8.49 13
81BRS B EAV=315.7 6
81BR G 789.254 19 0.091 4
81BR2 G %IG=0.0116 29
81BR cG E,RI$from 2015Kr02. Corresponding E|g is probably 789.1 {I5} listed
81BR2cG in 18.45-min decay dataset. In 1969Zo06, no determination for isomeric
81BR3cG decay. In 2015Kr02, not have much evidence for this line to belong to
81BR4cG the 18.45-min decay.