218AC 222PA A DECAY (4.1 MS) 1970BO13,1979SC09,2019MI0819NDS 201911
218AC H TYP=FUL$AUT=Balraj Singh, M.S. Basunia, Murray Martin et al.,$
218AC2 H CIT=NDS 160, 405 (2019)$CUT=30-Oct-2019$
218AC c 1970Bo13: measured E|a, I|a, hindrance factors, half-life of decay
218AC2c of {+222}Pa
218AC c 1979Sc09: measured E|a, half-life of decay of {+222}Pa
218AC c 2019Mi08: {+222}Pa activities obtained from the |a-decay
218AC2c chains starting from {+226}Np or in {+181}Ta({+48}Ca,X),E=212, 217, 226
218AC3c MeV at the UNILAC accelerator of GSI facility. Evaporation residues
218AC4c (ERs) were separated by the SHIP velocity filter and implanted into the
218AC5c COMPAct Spectroscopy Set-up (COMPASS), consisting of silicon detectors.
218AC6c Measured energy and time spectra of correlations between ERs and |a
218AC7c particles from subsequent decays; deduced E|a and half-lives of decays
218AC8c of {+222}Pa and {+218}Ac.
218AC d Production cross section of production of {+222}Pa: 1990An19
218AC cA E$From 1970Bo13. Uncertainty is not given by the authors, but
218AC2cA expected to be |?20 keV, based on data for other isotopes in
218AC3cA the paper. Only one |a of 8210 keV was observed by 1979Sc09.
218AC4cA In 2019Mi08, two main peaks were reported at 8.63 and 8.47 MeV, and
218AC5cA a third one at 8.31 MeV. It appears that |a energies are about 100
218AC6cA keV higher in 2019Mi08, as compared to those in 1970Bo13. Note that
218AC7cA statistics are much weaker in 2019Mi08 as compared to those
218AC8cA in 1970Bo13
218AC cA IA$From 1970Bo13.
218AC cA HF$r{-0}({+218}Ac)=1.5515 {I79}, obtained using
218AC2cA r{-0}({+218}Ra)=1.5571 {I17}, r{-0}({+216}Ra)=1.5664 {I65},
218AC3cA r{-0}({+220}Th)=1.5514 {I30}, and r{-0}({+218}Th)=1.529 {I15}
218AC cA E(A),IA(A),HF(A)$Complex peak in 1970Bo13, too broad to be a
218AC2cA single peak. Authors divide the peak in the three components.
218AC3cA Total multiplet intensity |?50 divided equally by the
218AC4cA evaluators between the three |a groups.
218AC cL E$Level energies are deduced from Q(|a)=8890 {I50} (syst, 2017Wa10)
218AC2cL and E|a values given here.
222PA P 0.0 4.1 MS 6 8890 SY
222PA cP T$Unweighted average of 4.5 ms {I3} (2019Mi08, time correlations
222PA2cP between {+222}Pa fragments and subsequent |a decays); 3.3 ms {I3}
222PA3cP (1995AnZY); 2.9 ms {I+6-4} (1979Sc09); 5.7 ms {I5} (1970Bo13). In
222PA4cP {+222}Pa Adopted Levels in the ENSDF database (March 2011 update),
222PA5cP value is adopted from 1979Sc09.
222PA cP QP$8890 {I50} (syst, 2017Wa10)
218AC N 1.0
218AC cN BR$Only |a decay has been observed for the decay of {+222}Pa.
218AC2cN Theoretical partial T{-1/2}=21.3 s for {+222}Pa |e decay
218AC5cN (2019Mo01) gives %|e+%|b{++}=0.02
218AC L 0.0 S
218AC L 193 AP
218AC A 8540 30 AP 105 AP
218AC cA E$|a peak is mixed somewhat with |a lines emitted by {+214m}Fr
218AC2cA activity. Other: 8.63 MeV {I4} (2019Mi08)
218AC L 407 AP
218AC A 8330 20 AP 40 AP
218AC cA E$|a peak is strongly mixed somewhat with 8.36 MeV-|a line emitted
218AC2cA by {+214}Fr activity. Other: 8.47 MeV {I4} (2019Mi08)
218AC L 529 AP
218AC A 8210 17 AP 22 AP A
218AC cA $I|a(8210|a+ 8180|a+ 8160|a)|?50 (1970Bo13). Other: 8.31 MeV {I4}
218AC2cA (2019Mi08), emitted from the decay of {+222}Pa, only when the activity
218AC3cA of {+222}Pa is produced directly in a reaction, not from the {+226}Np
218AC4cA |a-decay chain, which may suggest an isomer in {+222}Pa.
218AC L 560 AP
218AC A 8180 17 AP 18 AP A
218AC L 580 AP
218AC A 8160 17 AP 16 AP A