220RA 224TH A DECAY 1961RU06,1970VA13,2025TO0126NDS 202609
220RA H TYP=FUL$AUT=J.Chen, M.S. Basunia P.Dimitriou, et al.,$
220RA2 H CIT=NDS 212, 18 (2026)$CUT=31-Mar-2026$
220RA dA HF$Hindrance Factor is calculated by AlphaHF (version 11-Nov-2025)
220RA dG CC$From BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
220RA c 1961Ru06: {+224}Th obtained from the decay of {+228}U, produced by
220RA2c bombarding {+232}Th with helium ion beam, alpha particle spectrograph,
220RA3c Si and NaI(Tl) detectors, measured E|a, I|a, E|g, I|g, |a(K), |a-|g
220RA4c coin, |g-|g coin, etc.
220RA c 1970Va13: {+224}Th was produced from {+208}Pb({+22}Ne,|a2n) reaction;
220RA2c Si detector, measured E|a and I|a.
220RA c 2025To01: {+224}Th was produced from {+238}U fragmentation,
220RA2c E({+238}U)=1 GeV/u, on a {+9}Be target; Si-detectors, DSSD; measured
220RA3c E|a.
220RA c Others: 1989An13, 2000He17.
220RA cA HF$The nuclear radius parameter r{-0}({+220}Ra)=1.5388 {I27} is deduced
220RA2cA from assumed HF=1.0 for the ground-state to ground-state alpha decay
220RA3cA branch (using AlphaHF (version 11-Nov-2025)). Other:
220RA4cA r{-0}({+220}Ra)=1.5385 {I27} (2020Si16).
220RA cA E,IA$From 1961Ru06 (Table XI), unless otherwise noted.
220RA cA IA(A)$From |g-ray transition intensity balance.
220RA cG E,RI$From 1961Ru06 (Table XII, Level scheme Fig. 45). I|g per 100 |a
220RA2cG decays.
220RA cL E$From E|g data
220RA cL J,T$From Adopted Levels
224TH P 0 0+ 1.04 S 2 7299 6
224TH cP T$From Adopted Levels of {+224}Th in ENSDF database (2022 update).
224TH2cP Other: 0.55 s {I17} (2025Gu12 - half-life was determined for isotope
224TH3cP identification, method was not described).
224TH cP QP$From 2021Wa16.
220RA N 1.0 1.0
220RA PN 3
220RA G 90 2 0.02 1
220RA cG E$the evaluators list as unplaced E|g, does not fit to the level
220RA2cG scheme. The level scheme is based on the reported E|a from {+224}Th
220RA3cG feeding the g.s. and excited states of {+220}Ra.
220RA L 0 0+ 18 MS 2
220RA A 7168 7 79 2 1.0
220RA cA E$weighted average of 7170 {I10} (1970Va13), 7164 {I13} (2025To01),
220RA2cA 7170 {I17}, and 7170 {I20} (1989An13). Other: 7156 {I10} (2000He17).
220RA cA IA$others: 80 {I5} (1989An13), I|a=100-I|a(7000)=81 {I3} (1970Va13), 87
220RA2cA {I8} (2000He17), 82 {I4} from |g-transition intensity balance.
220RA L 177 2 2+
220RA A 7000 10 19 2 0.96 14
220RA cA E$from 1970Va13. Others: 6996 {I20} (2025To01), 7000 {I20} (1989An13),
220RA2cA 6990 (1961Ru06), 6984 {I15} (2000He17).
220RA cA IA$others: 20 {I5} (1989An13), 19 {I3} (1970Va13), 13 {I3} (2000He17),
220RA2cA 17 {I4} from |g-transition intensity balance.
220RA G 177 2 9 2 E2 0.92 4
220RAS G KC=0.203 5$LC=0.527 28$MC=0.143 8
220RAS G NC=0.0377 20$OC=0.0081 4$PC=0.00119 6$QC=1.019E-5 34
220RA cG M$|a(K)exp=0.22 from (K x ray)(|a)/(|g)(|a) (1961Ru06); theory:
220RA2cG |a(K)=0.203 {I5} for E2 177|g.
220RA L 411 3 (1-)
220RA cL J$1- is expected from the excited level energy ratio of
220RA2cL E(1{+-})/E(2{++}) for the even-even {+220-224}Ra isotopes (Fig. 43 in
220RA3cL 1961Ru06).
220RA A 6770 1.2 5 2.0 11 A
220RA G 235 3 0.4 3[E1] 0.0616 21
220RAS G KC=0.0494 16$LC=0.00932 33$MC=0.00223 8
220RAS G NC=0.000582 20$OC=0.000130 5$PC=2.14E-5 7$QC=1.32E-6 4
220RA G 410 3 0.8 3[E1] 0.0178 4
220RAS G KC=0.01444 30$LC=0.00254 5$MC=0.000602 13
220RAS G NC=0.0001577 34$OC=3.55E-5 8$PC=5.98E-6 13$QC=4.09E-7 8
220RA L 474 3 (3-)
220RA A 6700 0.3 1 4.5 18 A
220RA G 297 3 0.3 1[E1] 0.0360 10
220RAS G KC=0.0290 8$LC=0.00530 15$MC=0.00126 4
220RAS G NC=0.000331 9$OC=7.39E-5 21$PC=1.232E-5 34$QC=7.96E-7 21