191BI 195AT A DECAY (290 MS) 2013NY01,2003KE04,1999TA2024NDS 202403
191BI H TYP=FUL$AUT=M.S. Basunia$CIT=NDS 195, 368 (2024)$CUT=1-Dec-2023$
191BI c Other references: 2005Ke10, 2005Uu03, 2013Ka16, 2013Uu01.
191BI c 2013Ny01: Measured half-life, E|a, and IT branching, recoil-|a
191BI2c correlated decay measurements at Jyvaskyla cyclotron facility using
191BI3c RITU separator.
191BI c 2003Ke04,2005Ke10: Production of {+195}At by {+142}Nd({+56}Fe,p2n),
191BI2c E(lab)=255-268 MeV. The evaporation residues formed in
191BI3c the fusion reaction were separated using the RITU gas-filled mass
191BI4c separator and implanted into a position-sensitive Si strip
191BI5c detector. A multiwire proportional avalanche gas counter was used to
191BI6c discriminate |a-ray particles from other signals in the Si detector.
191BI7c A Compton-suppressed, 40% relative efficiency, Ge detector was used
191BI8c for prompt |a-|g coincidence measurements.
191BI c 1995Le15: Production of {+195}At from {+141}Pr({+56}Fe,2n),
191BI2c E=249 MeV. Reaction fragment separation using gas-filled mass
191BI3c separator RITU. Used parent-daughter, and time and position-correlated
191BI4c event evaluation.
191BI c 1999Ta20: Used reaction {+169}Tm({+36}Ar,|a6n), E=215 MeV. RIKEN
191BI2c ring cyclotron. Recoil reaction products separated with the gas-filled
191BI3c recoil separator GARIS. Detection of recoil fragments and decay |a
191BI4c rays using two-dimensional position-sensitive Si detector at the focal
191BI5c plane. Microchannel plate placed before this detector allows to
191BI6c distinguish evaporation residues from alpha particles. RDT method,
191BI7c analyzed correlated recoil-|a1-|a2 decay chains.
191BI cA HF$A r{-0}({+191}Bi)=1.548 {i10} is obtained is deduced from
191BI2cA interpolation (or unweighted average) of the r{-0} values for the
191BI3cA neighboring even-Z, N=108 isotones: r{-0}({+190}Pb)=1.511 {i4}, from
191BI4cA 2020Si16, and r{-0}({+192}Po)=1.585 {i15}.
191BI cL E,J,T$From Adopted Levels.
191BI dG CC$From BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
195AT P 0.0 (1/2+) 290 MS 20 7344 6
195AT cP J From 2014Hu18 (evaluation)
195AT cP T$From 2013Ny01,2014Hu18. Other values: 328 ms {I20} (2003Ke04, same
195AT2cP lab of 2013Ny01), 385 ms {I+69-51} (1999Ta20, also 1996PuZZ from the
195AT3cP same research group), 0.63 s {I+32-16} (1995Le15). T{-1/2} values
195AT4cP measured much less precisely, mainly for decay chain identification
195AT5cP purpose: 350 ms {I+240-160} (2013Ka16), 430 ms {I+590-160} (2013Uu01).
195AT cP QP$From 2021Wa16
191BI N 1
191BI L 148.7 5 (7/2-) 10 NS LT
191BI cL E,J,T From Adopted Levels.
191BI L 242 4 (1/2+) 125 MS 8 M
191BI2 L %IT=22 6 (2013Ny01)
191BI cL E,J,T From Adopted Levels. Also 242 keV {i4} (2021Ko07 - NUBASE).
191BI2cL Adopted E|a=6953 {I3} and Q|a{+195}At=7344 {I6} (2021Wa16) yields 245
191BI3cL keV {I7}.
191BI A 6953 3 100 1.49 12
191BI cA This |a-ray is seen in time-correlated |a{-1}-|a{-2}
191BI2cA measurements in coincidence with the 6870 keV {i3} |a ray which
191BI3cA deexcites the {+191}Bi (1/2+) isomeric level (2003Ke04,1999Ta20).
191BI cA E$from 2003Ke04. Others: 6955 {I8} (2013Ka16), 6960 {i20}
191BI2cA (1999Ta20), 6950 {i20} (1995Le15).
191BI cA The reduced |a width is estimated as 70 keV {i5} by 2003Ke04,
191BI2cA calculated by the method of Rasmussen, |DL=0, as well as an
191BI3cA estimated hindrance factor of 0.92 {i7}.
191BI G 93 4 [E3] 2.6E+2 7 S
191BIS G LC=1.9E+2 5$MC=55 16
191BIS G NC=14 4$OC=2.6 8$PC=0.20 6
191BI cG E$From level energy difference. The existence of
191BI2cG this |g ray has strong support from |a-|a coincidence measurements
191BI3cG showing that the 6953-keV |a ray from {+195}At g.s. decay to the
191BI4cG (|?242 keV, 1/2+) level in {+191}Bi is in coincidence with the 6308-keV
191BI5cG |a ray from the {+191}Bi g.s. decay to the 335-keV (9/2-) level in
191BI6cG {+187}Tl.
191BI cG M Multipolarity suggested on the basis of the J|p
191BI2cG values for the connected levels, and from similar transitions in
191BI3cG neighboring nuclei.