194BI 198AT A DECAY (4.46 S) 2019GH11,1992HU04,1996EN0121NDS 202109
194BI H TYP=FUL$AUT=Jun Chen and Balraj Singh$CIT=NDS 177, 1 (2021)$
194BI2 H CUT=3-Sep-2021$
194BI c 2019Gh11: {+198}At from |a decay of {+202}Fr, which was produced in
194BI2c U(p,X),E=1.4 GeV at ISOLDE-CERN facility using UC{-x} target and pulsed
194BI3c proton beam. Francium atoms were ionized and accelerated to 30 keV,
194BI4c followed by mass separation using High-Resolution separator (HRS).
194BI5c Measured E|a, I|a, |a|g-coin using Si surface barrier detectors for |a
194BI6c particles and two single-crystal HPGe detectors for |g detection.
194BI7c FWHM|?33 keV for E|a=5-8 MeV range. The two activities of {+202}Fr
194BI8c could not be separated in this work.
194BI c 1992Hu04: online mass-separated source from {+202}Fr |a decay produced
194BI2c in Ir({+20}Ne,xn){+202}Fr and {+181}Ta({+32}S,2p9n){+202}Fr, and
194BI3c directly in Re({+20}Ne,xn){+198}At. Measured E|a, I|a, |g rays,
194BI4c conversion electrons, |a|g(t) coin using Ge and Si(Li) detectors.
194BI c 1996En01: online mass separated (gas-filled recoil separator) source
194BI2c from {+202}Fr |a decay produced in {+170}Yb({+35}Cl,3n), E=171-186 MeV.
194BI3c Measured |a particles using semiconductor detector.
194BI c 2005Uu02, 2005Uu03: {+198}At produced in |a decay of {+202}Fr produced
194BI2c in {+141}Pr({+63}Cu,pn), E=278-288 MeV and in {+170}Yb({+36}Ar,p3n),
194BI3c E=180-185 MeV
194BI c 2014Ka23: {+198}At source from {+202}Fr |a decay, which was produced in
194BI2c {+149}Sm({+56}Fe,p2n), E({+56}Fe)=244-275 MeV reaction, with
194BI2c beam from GSI accelerator facility. Target=370 |mg/cm{+2} thick
194BI3c enriched to 96.9% in {+149}Sm, and backed with 40 |mg/cm{+2} thick
194BI4c carbon backing and covered with a 10 |mg/cm{+2} layer of carbon. It
194BI5c was mounted on a rotating wheel. Evaporation residues were separated
194BI6c using SHIP facility at GSI, and implanted into the detection system
194BI7c consisting of 16-strip position sensitive Si detectors (PSSD),
194BI8c a pack of six Si strip detectors (BOX) at the back to detect escaping
194BI9c |a particles, and three time-of-flight detectors in front of PSSDs.
194BIAc Measured position and time correlations between evaporation residues
194BIBc (ER) and |a events, E|a, half-lives of ground states and isomers of
194BICc {+202}Fr and {+198}At, Er-|a-|a correlations. Comparison with previous
194BIDc experimental results. (ER)|a|a correlated events were assigned to
194BIEc {+202}Fr -> {+198}At -> {+194}Bi decay chain
194BI c Others:
194BI c 2012Fo09: measured E|a, T{-1/2}
194BI c 1999Ta03: measured E|a, T{-1/2}
194BI c 1998Bo14: measured |a-decay branching ratios.
194BI c 1995BiZZ: measured E|a, T{-1/2}
194BI c 1987Wo04, 1987Wo11: measured E|a, I|a, |a-anisotropy,
194BI c 1980Ew03: measured E|a, |a-branchings, |a-reduced widths
194BI c 1975BaYJ: measured E|a, I|a, T{-1/2}
194BI c 1967Tr06: measured E|a, T{-1/2}
194BI cA E,IA$From 2019Gh11, unless otherwise stated
194BI cA HF$The nuclear radius parameter r{-0}({+194}Bi)=1.5187 {I42}
194BI2cA (2020Si16) deduced from interpolation (or unweighted average) of radius
194BI3cA parameters of the adjacent even-even nuclides, as given in 2020Si16:
194BI4cA {+192}Pb, {+194}Pb, {+194}Po, and {+196}Po.
194BI cG E$From 2019Gh11
194BI cG RI$Relative branching ratios deduced by evaluators from |a|g-coin
194BI2cG intensities from 2019Gh11 listed under comments
194BI cG $Intensities from |a|g-coin data are given under comments, and are
194BI2cG relative to 100 for I(6358|a-218.2|g-coin) in the decay of (3+)
194BI3cG g.s. of {+218}At (2019Gh11)
194BI cG M$Deduced by 2019Gh11 from intensity balance arguments.
194BI cL E$From E|g values.
194BI cL J$From the Adopted Levels
198AT P 0 (3+) 4.46 S 10 6889.4 19
198AT cP J$From {+198}At Adopted Levels in the ENSDF database (Dec 2015 update)
198AT cP T$From |a decay curves; quoted values is weighted average of 4.47 s
198AT2cP {I10} (2019Gh11), 4.2 s {I20} (2012Fo09), 3.8 s {I4} (2005Uu02),
198AT3cP 4.6 s {I+18-10} (1996En01), 4.2 s {I3} (1992Hu04), and 4.9 s {I5}
198AT4cP (1967Tr06). Other: 3.0 s {I1} (2014Ka23) is considered discrepant.
198AT5cP Half-life of 4.2 s {I2} in {+198}At Adopted Levels in the
198AT6cP ENSDF database (Dec 2015 update) is revised here with the inclusion of
198AT7cP 2019Gh11 measurement
198AT cP QP$From 2021Wa16
194BI N 0.97 3
194BI cN BR$From %|a|>94 (1995BiZZ). Others: %|a=76 {I21} (1998Bo14),
194BI2cN >80 (1992Hu04), >90 (1980Ew03).
194BI PN 6
194BI A 6152 11
194BI cA $6152|a observed in coin with 218|g and 382|g. 2019Gh11 tentatively
194BI2cA propose a level in {+194}Bi at 600 keV deexciting by a cascade of
194BI3cA 218 and 382 |g rays. Authors stated that it remained unclear whether
194BI4cA one of these |g rays is the same as the 218.2 or 382.4 feeding the
194BI5cA g.s. If a level is defined at 600 keV, then 218 and/or 382 must be
194BI6cA a doublet
194BI G 218 1
194BI cG $See comment for 6152|a for possible placement of this |g
194BI cG $I(6152|a-218|g-coin)=6 {I2}
194BI G 382 1
194BI cG $See comment for 6152|a for possible placement of this |g
194BI cG $I(6152|a-382|g-coin)=4 {I2}
194BI L 0.0 (3+)
194BI A 6750 4 100 2.61 11
194BI cA E$weighted average of 6747 {I5} (2014Ka23), 6749.0 {I34} (2012Fo09),
194BI2cA 6748 {I6} (2005Uu02), 6753 {I4} (1996En01), 6755 {I4} (1992Hu04),
194BI3cA 6747 {I15} (1980Ew03), 6747 {I5} (1967Tr06). Others: 6755 (1995BiZZ),
194BI4cA 6724 {I26} (2015We13)
194BI cA $Reduced |a width |d{-|a}{+2}=26 keV {I1} (2019Gh11), 39 keV {I2}
194BI2cA (2014Ka23)
194BI L 218.2 1 (2+,3+,4+)
194BI A 6537 8 0.020 3 1.98E3 31
194BI cA E$weighted average of 6535 {I8} (2019Gh11) and 6539 {I10} (1992Hu04)
194BI cA $Reduced |a width |d{-|a}{+2}=0.034 {I5} (2019Gh11)
194BI G 218.2 1 100 M1+E2 1.0 6 0.7 3
194BI2 G EKC=0.5 3 (2019Gh11)
194BI cG E$see comment for unplaced 6152|a, where another 218|g is possible,
194BI2cG suggesting a doublet. Other: 218 {I1} (1992Hu04)
194BI cG M,MR$from |a(K)exp determined from intensity ratio between K x-rays
194BI2cG and 218-keV |g rays (2019Gh11), from which evaluators deduce
194BI3cG |d(E2/M1)=1.0 {I6}
194BI cG $I(6535|a-218.2|g-coin)=21 {I3}
194BI cG $I(6358|a-218.2|g-coin)=100
194BI cG $I(6275|a-218.2|g-coin)=39 {I5}
194BI L 382.4 1 (1:5)(+)
194BI A 6361 9 0.008 2 1.12E3 29
194BI cA $Reduced |a width |d{-|a}{+2}=0.06 {I2} (2019Gh11)
194BI G 382.4 1 100 [M1+E2] 0.15 9
194BI cG $I(6361|a-382.4|g-coin)=9 {I2}
194BI cG $I(6275|a-382.4|g-coin)=61 {I7}
194BI L 399.6 1 (1:5)(+)
194BI A 6359 8 0.11 1 70 7
194BI cA E$weighted average of 6358 {I8} (2019Gh11) and 6360 {I10} (1992Hu04)
194BI cA IA$other: 0.34 {I5} (1992Hu04)
194BI cA $Reduced |a width |d{-|a}{+2}=1.0 {I1} (2019Gh11)
194BI G 181.4 1 100 12 (M1) 1.88
194BI cG M$dominant M1 from intensity balance considerations of 181-218
194BI2cG |g cascade (2019Gh11); with possible E2 admixture
194BI cG E$other: 181 {I1} (1992Hu04)
194BI cG $I(6358|a-181.4|g-coin)=52 {I6}
194BI G 399.7 2 44 8 [M1+E2] 0.13 8
194BI cG $I(6358|a-399.7|g-coin)=23 {I4}
194BI L 485.5 2 (1:5)(+)
194BI A 6275 8 0.08 1 43 6
194BI cA $Reduced |a width |d{-|a}{+2}=1.6 {I3} (2019Gh11)
194BI G 103.4 2 31 8 (E2) 7.6 17
194BI cG M$dominant E2 from intensity balance considerations of 103-382
194BI2cG |g cascade (2019Gh11); with possible M1 admixture
194BI cG $I(6275|a-103.4|g-coin)=8 {I2}
194BI G 267.1 1 100 15 (M1) 0.638
194BI cG M$dominant M1 from intensity balance considerations of 267-218
194BI2cG |g cascade (2019Gh11); with possible E2 admixture
194BI cG $I(6275|a-267.1|g-coin)=26 {I4}
194BI G 485.8 7 15 8 [M1+E2] 0.08 5
194BI cG $I(6275|a-485.8|g-coin)=4 {I2}