222TH 226U A DECAY (268 MS) 1998GR19,2000HE17,1989AN1323NDS 202310
222TH H TYP=FUL$AUT=Balraj Singh, M.S. Basunia, Jun Chen et al.,$
222TH2 H CIT=NDS 192, 315 (2023)$CUT=25-Sep-2023$
222TH c This dataset prepared by P. Dimitriou, B. Singh, and IAEA-ICTP
222TH2c workshop participants: M.J. Lazaric and C. Ngwetsheni.
222TH c 2000He17, 2002CaZU: {+226}U was produced in heavy-ion fusion
222TH2c {+208}Pb({+22}Ne,4n) at GSI. Fusion products were separated in-flight
222TH3c reaction using the velocity filter SHIP. Measured E|a, I|a, half-life
222TH4c of {+226}U decay by |a|a- and |a|g-coin. FWHM=18-20 keV for E|a.
222TH5c In 2002CaZU, half-life of {+226}U decay was reported as 258 ms {I13}.
222TH d 2002CaZZ superseded by 2002CaZU
222TH c 1998Gr19, 1999Gr28 (also 2001Ku07, 1997En10): {+226}U produced in
222TH2c {+208}Pb({+22}Ne,4n),E({+22}Ne)=111 MeV at the K130 cyclotron facility
222TH3c of the University of Jyvaskyla, followed by the separation of fusion
222TH4c products using the gas-filled magnetic separator RITU. Measured E|a,
222TH5c I|a, half-life of {+226}U decay by recoil-|a tagging technique using
222TH6c silicon strip detector for |a particles with FWHM better than 30 keV
222TH7c for E|a|?7.5-MeV. In 2001Ku07 (conference article), a
222TH8c position-sensitive PIPS Si detector was used for |a detection for
222TH9c which resolution was stated as 35 keV.
222TH c 1989An13, 1990An22: {+226}U and {+230}Pu were produced in heavy-ion
222TH2c fusion reactions {+208}Pb({+22}Ne,4n) and {+208}Pb({+26}Mg,4n),
222TH3c respectively, at JINR. Fusion products were separated in-flight by
222TH3c the VASSILISSA kinematic separator. Measured E|a, I|a, T{-1/2} using
222TH4c |a-spectroscopy, with FWHM=40-60 keV, and 35 keV, respectively.
222TH c 1973Vi10: measured E|a, T{-1/2} of {+226}U decay by bombarding
222TH2c {+232}Th with 140 MeV {+4}He ions from University of Maryland
222TH3c cyclotron, and using secular equilibrium technique. FWHM=50 keV
222TH4c for |a-particle detection.
222TH c 1970Va13: measured E|a, T{-1/2} of {+222}Th decay chain at the
222TH2c Berkeley HILAC.
222TH c 2018Mi11 (conference article): {+226}U from the |a decay of {+230}Pu,
222TH2c produced in W({+48}Ca,X){+230}Pu,E({+48}Ca)=4.55 MeV/nucleon; measured
222TH3c E|a and half-life for the decay of {+226}U using the new COMPASS
222TH4c detection system with SHIP fragment separator at GSI facility.
222TH c 2003MoZT: {+226}U produced in a decay chain starting from {+234}Bk
222TH2c decay, where the activity was produced in {+197}Au({+40}Ar,3n),
222TH3c E({+40}Ar)=188.4 MeV, followed by separation of reaction products
222TH4c using the Gas-Filled Recoil-Ion Separator (GARIS) at RIKEN.
222TH5c For four events assigned to the decay of {+234}Bk, |a decay times
222TH6c for {+226}U |a decay were given as 196 ms, 149 ms, 464 ms, and
222TH7c 1370 ms.
222TH d 2023Xi06, 2009Ni06, 2009Ro06, 2008Sa40, 2007Pe30: theoretical
222TH2d calculations of |a-decay half-life.
222TH cA HF$The nuclear radius parameter r{-0}({+222}Th)=1.5387 {I27}
222TH2cA is deduced by assuming HF=1.0 for the ground-state to
222TH3cA ground-state alpha decay branch.
226U P 0.0 0+ 268 MS 9 7701 4
226U cP T$From |a decay. Weighted average of measured values of
226U 2cP 258 ms {I13} (2002CaZU, from the same lab as 2000He17, but an
226U 3cP independent experiment); 281 ms {I9} (2000He17); 260 ms {I10}
226U 4cP (1998Gr19, also 260 ms {I20} in 2001Ku07, 230 ms {I+60-40} in
226U 5cP 1999Gr28, and 160 ms {I+21-17} tentative result in 1997En10, all
226U 6cP from the same lab); and 200 ms {I50} (1994Ye08,1990An22, also
226U 7cP 0.25 s {I+15-10} in 1989An13 from the same lab). Others: 0.4 s {I1}
226U 8cP (2018Mi11), and 0.5 s {I2} (1973Vi10).
226U cP QP$From 2021Wa16
222TH N 1.0
222TH cN BR$Only the |a decay of {+226}U has been observed. From theoretical
222TH2cN T{-1/2}(|b)>100 s and T{-1/2}(|a)=0.65 s (2019Mo01), %|e+%|b{++}<0.65.
222TH3cN Other: %|e+%|b{++}<0.05 (from gross theory of |b decay, 1973Ta30).
222TH A 7450 30
222TH cA E$from 2018Mi11 only, as authors report two |a transitions:
222TH2cA 7400 {I30} which likely corresponds to 7387 {I5} |a, and
222TH3cA 7450 {I30} |a. Note that the two |a energies reported by 2018Mi11
222TH4cA overlap within the uncertainties.
222TH L 0.0 0+ 1.964 MS 2
222TH cL T$from the Adopted Levels
222TH A 7563 5 84 3 1.00
222TH cA E$weighted average of 7570 {I30} (2018Mi11); 7560 {I10} (2002CaZU, from
222TH2cA the same lab as 2000He17 but an independent experiment); 7555 {I10}
222TH3cA (2000He17); 7565 {I5} (1999Gr28, 1998Gr19, 7566 {I4} in
222TH4cA 2001Ku07, 7566 {I20} in 1997En10); and 7570 {I15} (1990An22, 7570 {I20}
222TH5cA in 1989An13). Others: 7430 {I30} (1973Vi10), 7500 {I50} (1970Va13)
222TH cA IA$weighted average of 86 {I3} (2002CaZU, from the same lab as
222TH2cA 2000He17, but an independent experiment); 82 {I5} (2000He17);
222TH3cA 82 {I4} (1999Gr28, 85 {I11} in 2001Ku07, |?72 in 1997En10); and
222TH4cA 85 {I5} (1989An13).
222TH L 181 8 2+ 240 PS 20
222TH cL E$from E|a=7387 {I7} for decay to the 2+ level, and Q(|a)=7701 {I4}
222TH2cL for the decay of {+226}U. Other: 182.9 {I2} in the Adopted Levels.
222TH cL J,T$from the Adopted Levels
222TH A 7387 5 16 2 1.3 2
222TH cA E$weighted average of 7384 {I20} (2002CaZU, from the same lab as
222TH2cA but an independent experiment); 7374 {I10} (2000He17);
222TH3cA and 7390 {I5} (1999Gr28, 7384 {I7} in 2001Ku07, 7394 {I20} in
222TH4cA 1997En10). Others: two transitions of E|a=7400 {I30} and 7450 {I30}
222TH5cA (2018Mi11), 7420 {I20} (1989An13).
222TH cA IA$weighted average of 14 {I3} (2002CaZU, from the same lab as
222TH2cA but an independent experiment); 15 {I3} (2000He17); 18 {I2}
222TH3cA (1999Gr28, 15 {I5} in 2001Ku07, |?28 in 1997En10); and
222TH4cA 15 {I5} (1989An13)
222TH L 246 20 (1-)
222TH cL E$from E|a=7323 {I20} for decay to the (1-) level, and Q(|a)=7701 {I4}
222TH2cL for the decay of {+226}U.
222TH cL J$proposed by 2000He17, based on systematics of 1- states in
222TH2cL neighboring nuclei
222TH A 7323 20 3 1 4.0 14
222TH cA E,IA$from 2000He17