217PO 221RN A DECAY (25.7 M) 1977VY02,1997LI23,2004LI2818NDS 201802
217PO H TYP=FUL$AUT=B. SINGH, T. ROY, K. BANERJEE$CIT=NDS 147, 382 (2018)$
217PO2 H CUT=1-DEC-2017$
217PO c 1977Vy02: measured E|a, I|a, E|g, I|g, ce
217PO c 1997Li23, 2004Li28: measured E|a, I|a, E|g, I|g, |a|g-coin, half-lives
217PO2c of decays of {+221}Rn and {+217}Po, decay branching ratios.
217PO c Based on configurations of the parent and daughter state fed by
217PO2c 6037|a and corresponding HF, 2004Li28 tentatively propose 6037|a to an
217PO3c 11/2+ state, and the (9/2+) ground state below it at an energy of 9.5
217PO4c or 19.8 keV, and the 254|g and 264|g feeding the 11/2+ state rather
217PO5c than the 9/2+ g.s. However, from {+217}Bi |b{+-} decay studies by
217PO6c 2003Ku25 and 2014Mo02, there does not seem to be any evidence of such a
217PO7c scenario of {+217}Po level scheme
217PO cA E$From 1997Li23 and 1977Vy02, with uncertainties from 1997Li23.
217PO2cA 1977Vy02 quoted uncertainty of 3 keV for each E|a value. Values in
217PO3cA 1977Vy02 were adjusted downward by 2 keV by 1991Ry01 in a
217PO4cA re-calibration procedure
217PO cA IA$Intensities per 100 |a decays, uncertainties are not available.
217PO cA HF$r{-0}({+217}Po)=1.5521 {I2}, interpolation of r{-0}({+216}Po)=
217PO2cA 1.5555 {I2} and r{-0}({+218}Po)=1.5487 {I2} (1998Ak04). Values
217PO3cA deduced by evaluators using above r{-0} parameter
217PO cG E,RI$From 1977Vy02. The authors normalized I|g values to I|g(218|g
217PO2cG of {+221}Fr decay)=10.7% {I6}. The relative Ice values measured by
217PO3cG 1977Vy02, were normalized to Ice(K 218|g)=1.5% {I2}.
217PO cL E$From E|g values
217PO cL J,T$From Adopted Levels
221RN P 0.0 7/2(+) 25.7 M 5 6148 2
221RN cP J$Spin measured by 1987Bo29, laser spectroscopy. Parity from possible
221RN2cP allowed |b transition to a 294, (9/2)+ level in {+221}Fr. Note that
221RN3cP J|p is 7/2+ in the January 2007-update of ENSDF database for {+221}Rn.
221RN cP T$From 1997Li23 and 2004Li28. Note that in the January 2007-update of
221RN2cP ENSDF database for {+221}Rn, value is 25 min {I2}, taken from 1956Mo15,
221RN3cP where 1997Li23 and 2004Li28 references were not included.
221RN cP QP$From E|a=6037 {I2}, assuming that this |a feeds the g.s.
221RN2cP rather than a level at 9.5 or 19.8 keV as tentatively proposed
221RN3cP in 2004Li28. Based on the proposal by 2004Li28, 2017Wa10 deduced
221RN4cP 6163 keV {I3}
217PO N 4.3 5 0.20 2
217PO cN NR$Absolute intensities were obtained by 1977Vy02 by normalizing
217PO2cN relative I|g data to I|g(218.19|g of {+221}Fr |a decay)=10.7%
217PO3cN {I6}; I|g=11.44% {I16} has been adopted in {+221}Fr |a decay scheme.
217PO4cN Since this corresponds to per 100 |b{+-} decays of {+221}Rn
217PO5cN normalization factor for converting I|g per 100 |a decays is:
217PO6cN [(80 {I2})/(20 {I2})][(11.44 {I16})/(10.7 {I6})]=4.3 {I5}
217PO cN BR$unweighted average of |a branchings determined by 1977Vy02 and by
217PO2cN 1997Li23: |a/|b{+-}={ 22 {I1}}/{ 78 {I1}} was obtained by 1977Vy02 by
217PO3cN comparing intensities of {+221}Rn, {+221}Fr,{+217}Po and {+217}At |a
217PO4cN groups present in the mass-separated source in equilibrium with its
217PO5cN daughters; |a/|b{+-}={ 18 {I1}}/{ 82 {I1}} was deduced by 1997Li23.
217PO6cN Note that in the January 2007-update of ENSDF database for {+221}Rn,
217PO7cN values are 22 {I1} for %|a decay and 78 {I1} for |b{+-} decay, taken
217PO8cN from 1977Vy02, and where 1997Li23 reference was missed.
217PO PN 3
217PO L 0.0 (9/2+) 1.53 S 5
217PO A 6037 2 81 13
217PO cA IA$average of 82 (1977Vy02) and 80 (1997Li23).
217PO L 254.2 3 (7/2+)
217PO A 5788 2 11 7
217PO cA IA$average of 10 (1977Vy02) and 12 (1997Li23).
217PO G 254.2 3 2.1 2 (E2) 0.210 3
217POS G KC=0.0975 14$LC=0.0841 13$MC=0.0220 4$
217POS G NC=0.00565 9$OC=0.001096 17$PC=0.0001067 16
217PO cG M$E2 or E1 from measured Ice(K)<0.2 (1977Vy02), and |a(K)exp<0.1, but
217PO2cG E2 gives a better |g-intensity balance at the 254.2 level.
217PO L 264.68 4 (11/2+)
217PO A 5778 2 7.5 9
217PO cA IA$average of 8 (1977Vy02) and 7 (1997Li23).
217PO G 264.68 4 1.13 8 (M1(+E2)) 1.8 LT 0.5 2
217PO cG M,MR$from Ice(K)=0.46 {I23} to 0.76 {I23} (1977Vy02), with implied
217PO2cG |a(K)(exp)=0.41 {I21} to 0.67 {I21} (in 0.20-0.88 range), which
217PO3cG is consistent with M1, M1+E2, E3 or E4. The high multipolarities are
217PO4cG less likely as these would imply the 264.68 level to be an isomer of
217PO5cG long half-life, which is not the case from observed |a|g-coincidences
217POS G KC=0.4 2 $ LC=0.09 1$ MC=0.022 2$ NC=0.0056 6$OC=0.00115 14