216FR 220AC A DECAY 1997SH09 26NDS 202603
216FR H TYP=FUL$AUT=C. Morse$CIT=NDS 209, 409 (2026)$CUT=5-Aug-2025$
216FR cA HF$The nuclear radius parameter r{-0}({+216}Fr)=1.5704 {I33} is
216FR2cA deduced from interpolation of radius parameters of the adjacent
216FR3cA even-even nuclides in 2020Si16
216FR cA E,IA$Data are from 1997Sh09 and are taken at face value, despite
216FR2cA giving no uncertainties. It is unclear whether these values are
216FR3cA measured in |a spectroscopy or deduced from |g spectroscopy. Data
216FR4cA from 1970Bo13 and 2007Ku30 are given with associated uncertainties in
216FR5cA comments; they are less complete, but generally consistent with
216FR6cA 1997Sh09. The I{-|a} values are discrepant with those deduced from
216FR7cA |g-ray intensity balance at each level.
216FR c 2007Ku30: {+220}Ac produced via {+209}Bi({+14}N,p2n) reaction at 5.6
216FR2c MeV/u at the Heavy Ion Laboratory at Warsaw University. The reaction
216FR3c products were caught in a helium gas cell and transported through a
216FR4c magnetic separator, then implanted into a 30-|mg/cm{+2} carbon foil
216FR5c viewed by several silicon detectors. Measured E{-|a}, T{-1/2}.
216FR c 1997Sh09: measured: E|a, I|a, E|g, I|g, ce, |a|g, |a(ce), |g(ce).
216FR2c Source: {+224}Pa + {+220}Ac in secular equilibrium produced by
216FR3c {+209}Bi({+18}O,2n). Ge, Ge(Li), Si(Li) detectors.
216FR c 1971EpZY: measured: |a, |a|g, |g|g, |a|g(t)
216FR c 1970Bo13: measured: |a
216FR cL E$From a least-squares fit to E{-|g}
216FR cL J$From Adopted Levels
216FR cL SEQ(A)$|ph{-9/2}{+5}|ng{-9/2}{+3}
216FR cL SEQ(B)$|ph{-9/2}{+4}|pf{-7/2}|ng{-9/2}{+3}
216FR cL SEQ(C)$|ph{-9/2}{+5}|ng{-9/2}{+2}|ni{-11/2}
216FR cG M$Deduced from measured internal conversion coefficients.
216FR dA HF$Hindrance Factor is calculated by AlphaHF (version 16-Dec-2025)
216FR DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
220AC P 0 (3-) 26.1 MS 5 8348 4
220AC cP J$Suggested in 1996Li05 based on the observed large hindrance factors
220AC2cP in {+224}Pa |a decay.
220AC cP T$From 1970Bo13. Other: 26.4 ms {I20} (1990An19)
220AC cP QP$From 2021Wa16
216FR N 0.1 1.0
216FR cN NR$Intensities given per 1000 |a decays in 1997Sh09
216FR cN BR$Only |a decay has been observed (1997Sh09)
216FR G 112.7 3 5.7 20
216FRX G %IG=0.57 20
216FR G 127.1 4 3 AP
216FR G 151.5 4 7.0 25
216FRX G %IG=0.70 25
216FR G 169.2 3 4.3 11
216FRX G %IG=0.43 11
216FR G 179.3 4 3.8 13
216FRX G %IG=0.38 13
216FR G 197.3 5 3 AP
216FR G 214.8 3 5.1 16
216FRX G %IG=0.51 16
216FR G 221.3 3 6.2 18
216FRX G %IG=0.62 18
216FR G 238.8 3 10.5 28
216FRX G %IG=1.05 28
216FR G 260.8 5 5.0 17
216FRX G %IG=0.50 17
216FR G 263.6 4 6.2 20
216FRX G %IG=0.62 20
216FR G 265.4 4 9 3
216FRX G %IG=0.90 30
216FR L 0 (1-) 0.70 US 2 A
216FR cL T$From Adopted Levels
216FR A 8194 4 4012
216FR cA E$8195 {I10} (1970Bo13), 8196 {I4} (2007Ku30)
216FR cA IA$3 {I1} (1970Bo13).
216FR L 133.30 10 (3-) 71 NS 5 AM
216FR2 L %A GT 0 (1997SH09)
216FR cL T$From 1971EpZY
216FR G 133.3 1 82 7 E2 2.65 4
216FRX G EKC/ELC=0.2 LT (1997Sh09) $EL2C/EL3C=2.0 5 (1997Sh09)$%IG=8.2 7
216FRS G KC=0.314 4$LC=1.717 25$MC=0.464 7$NC=0.1218 18$OC=0.0253 4$
216FRS G PC=0.00329 5$QC=1.302E-5 18
216FR A 8063 2 3351
216FR L 141.60 20 (0-,1-,2-) A
216FR G 141.6 2 13.2 30 M1 5.32 8
216FRX G %IG=1.32 30
216FRS G KC=4.29 6$LC=0.787 11$MC=0.1876 27$NC=0.0492 7$OC=0.01099 16$
216FRS G PC=0.001763 26$QC=9.85E-5 14
216FR A 8055 4 1586
216FR cA $E|a=8060 {I10}, I|a=6 {I1} (1970Bo13)
216FR L 191.18 13 (5-) A
216FR G 57.9 1 6.6 20 E2 118.3 19
216FRX G ELC=50 20 (1997Sh09)$%IG=0.66 20
216FRS G LC=87.2 14$MC=23.5 4$NC=6.16 10$OC=1.274 21$PC=0.1625 26$QC=0.000257 4
216FR A 8006 3 1518
216FR cA $E|a=8005 {I10}, I|a=5 {I3} (1970Bo13)
216FR L 211.92 17 B
216FR G 78.6 2 5 2
216FRX G %IG=0.50 20
216FR L 226.09 13 (4-) A
216FR G 34.9 3 2 AP (M1)
216FR G 92.8 1 37 5 M1 3.50 5
216FRX G ELC=2.3 5 (1997Sh09)$%IG=3.7 5
216FRS G LC=2.66 4$MC=0.634 9$NC=0.1661 24$OC=0.0371 5$PC=0.00596 9$
216FRS G QC=0.000333 5
216FR A 7971 4 900
216FR cA $E|a=7985 {I10}, I|a=4 {I2} (1970Bo13)
216FR L 247.8 4 B ?
216FR G 247.8 4 4.7 14 ?
216FRX G %IG=0.47 14
216FR L 249.40 16 B
216FR G 37.4 3 2 AP
216FR L 254.38 17 (1-,2,3-) A
216FR G 42.5 2 3 AP
216FR G 121.0 2 8.0 14
216FRX G %IG=0.80 14
216FR G 254.4 5 5.4 17
216FRX G %IG=0.54 17
216FR A 7944 2 AP1485 AP
216FR L 290.42 16 B
216FR G 64.3 1 18 3
216FRX G %IG=1.80 30
216FR cG M$from intensity balance, not E2 (I(|g+ce)=1307); M1 gives
216FR2cG I(|g+ce)=212
216FR L 344.21 15 C
216FR G 53.6 2 3 AP
216FR G 94.8 1 25 4
216FRX G %IG=2.5 4
216FR G 118.2 2 13.5 35 (M1) 8.90 13
216FRX G EKC=3 GT (1997Sh09)$%IG=1.35 35
216FRS G KC=7.16 11$LC=1.321 20$MC=0.315 5$NC=0.0826 12$OC=0.01846 27$
216FRS G PC=0.00296 4$QC=0.0001654 25
216FR G 153.1 2 18.2 35
216FRX G %IG=1.82 35
216FR A 7855 26 62
216FR cA $E|a=7850 {I10}, I|a=24 {I2} (1970Bo13)
216FR L 349.25 23 C
216FR G 137.3 2 15 3
216FRX G %IG=1.50 30
216FR A 7850 5 310
216FR L 409.31 18 C
216FR G 160.0 1 32.7 50 M1 3.76 5
216FRX G EKC/ELC=5 1 (1997Sh09)$%IG=3.3 5
216FRS G KC=3.03 4$LC=0.555 8$MC=0.1324 19$NC=0.0347 5$OC=0.00776 11$
216FRS G PC=0.001244 18$QC=6.95E-5 10
216FR cG M$K/L=5 {I1}
216FR A 7792 10 102
216FR cA $E|a=7790 {I10}, I|a=13 {I2} (1970Bo13)
216FR L 493.37 20 C
216FR G 149.0 3 9.5 28
216FRX G %IG=0.95 28
216FR G 203.6 5 3 AP
216FR G 243.7 2 18 4 M1 1.156 16
216FRX G EKC=1.1 5 (1997Sh09)$%IG=1.8 4
216FRS G KC=0.932 13$LC=0.1696 24$MC=0.0404 6$NC=0.01059 15$OC=0.002367 34$
216FRS G PC=0.000380 5$QC=2.119E-5 30
216FR G 267.8 3 18 4 M1 0.890 13
216FRX G EKC=1.2 5 (1997Sh09)$%IG=1.8 4
216FRS G KC=0.718 10$LC=0.1304 19$MC=0.0311 4$NC=0.00814 12$OC=0.001820 26$
216FRS G PC=0.000292 4$QC=1.629E-5 23
216FR A 7709 11 51
216FR L 532.11 20 C
216FR G 123.3 3 5.5 14
216FRX G %IG=0.55 14
216FR G 182.8 3 5.4 16
216FRX G %IG=0.54 16
216FR G 187.8 2 14.4 30
216FRX G %IG=1.44 30
216FR G 305.6 4 10.2 38
216FRX G %IG=1.0 4
216FR A 7670 8 53
216FR cA $E|a=7680 {I20}, I|a=21 {I5} (1970Bo13)
216FR L 539.4 3 C
216FR G 130.4 4 4 AP
216FR G 312.9 4 14.2 40 (M1) 0.580 8
216FRX G EKC=0.7 AP (1997Sh09)$%IG=1.4 4
216FRS G KC=0.468 7$LC=0.0848 12$MC=0.02017 29$NC=0.00529 8$OC=0.001182 17$
216FRS G PC=0.0001897 27$QC=1.059E-5 15
216FR A 7664 4 101
216FR L 550.85 20 C
216FR G 206.7 2 12 3
216FRX G %IG=1.20 30
216FR G 296.4 3 20.3 50 M1 0.673 10
216FRX G EKC=0.8 4 (1997Sh09)$%IG=2.0 5
216FRS G KC=0.543 8$LC=0.0985 14$MC=0.02343 33$NC=0.00614 9$OC=0.001373 20$
216FRS G PC=0.0002203 31$QC=1.229E-5 18
216FR G 301.4 3 13.0 42
216FRX G %IG=1.3 4
216FR A 7652 9 41
216FR L 568.8 3 C
216FR G 342.7 3 34.5 50 M1 0.452 6
216FRX G EKC=0.5 2 (1997Sh09)$%IG=3.5 5
216FRS G KC=0.365 5$LC=0.0660 9$MC=0.01570 22$NC=0.00412 6$OC=0.000920 13$
216FRS G PC=0.0001476 21$QC=8.24E-6 12
216FR G 378 1 2 AP
216FR A 7635 4 82
216FR L 581.5 3 C
216FR G 172.2 3 5.0 13
216FRX G %IG=0.50 13
216FR G 327.0 6 4 AP
216FR G 390.2 5 6.6 25
216FRX G %IG=0.66 25
216FR G 448.4 10 2 AP
216FR A 7622 4 74
216FR cA $E|a=7610 {I20}, I|a=9 {I4} (1970Bo13)