216AT 220FR A DECAY 1996SH05,1968BA73 26NDS 202603
216AT H TYP=FUL$AUT=C. Morse$CIT=NDS 209, 409 (2026)$CUT=5-Aug-2025$
216AT c 1996Sh05: Radioactivity of {+220}Fr (from {+224}Ac |a decay), produced
216AT2c by Th(p,X), E=200 MeV; ISOCELE separator; Ge detectors; measured
216AT3c E|a, I|a, E|g, I|g, |a|g, |a(ce)
216AT c 1974Ho27, 1968Ba73: measured E|a, I|a
216AT c Others: 1964Br16, 1964Mc21
216AT cA E$From 1968Ba73, except where noted otherwise. Authors' values have
216AT2cA been increased by 1.5 keV to correct for more recent values of
216AT3cA calibration energies (1991Ry01). Others: 1964Br16, 1964Mc21, 1974Ho27
216AT cA IA$From 1996Sh05
216AT cA E(A)$From 1991Ry01, based on measurements of 1968Ba73 and 1974Ho27
216AT cL E$From least squares fit to E|g, unless noted otherwise
216AT cL J,T$From adopted levels
216AT cL E(A)$May belong to |ph{-9/2}{+3}|ng{-9/2}{+5} configuration (1996Sh05)
216AT cL E(B)$Possibly a mixture of |p(h{-9/2}{+2}f{-7/2}{+1})|ng{-9/2}{+5}
216AT2cL and |ph{-9/2}{+3}|n(g{-9/2}{+4}i{-11/2}) configurations (1996Sh05)
216AT cG E(A)$From level-energy difference
216AT cA HF$The nuclear radius parameter r{-0}({+216}At)=1.5548 {I21} is
216AT2cA deduced from interpolation (or unweighted average) of radius
216AT3cA parameters of the adjacent even-even nuclides.
216AT cA IA$The |a-decay feeding deduced from I{-|g} intensity balance at each
216AT2cA level is discrepant with the measured I{-|a}, particularly for the
216AT3cA ground state and first two excited states. This may be due to
216AT4cA unobserved transitions, e.g. a possible 12-keV E2 transition between
216AT5cA the (4){+-} and (2){+-} levels.
216AT cG E,RI$From 1996Sh05, unless otherwise noted.
216AT cG M$Based on experimental conversion coefficients measured in 1996Sh05.
216AT DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
220FR P 0 1+ 27.4 S 3 6800.7 19
220FR cP J$From 1971Br13
220FR cP T$From 1974Ho27. Others: 30 s {I2} (1982Bo04), 27.5 s {I15}
220FR2cP (1949Me54,1951Me10), |?30 s (1948Gh01, superseded by 1951Me10), 31.1
220FR3cP s {I50} (2025Gu12).
220FR cP QP$From 2021Wa16
216AT N 0.100 0.9965
216AT cN BR$From %|b{+-}=0.35 deduced in 1971Br13. Previous evaluations have
216AT2cN assigned an uncertainty of 0.05 to %|b{+-}, apparently starting with
216AT3cN the A=220 evaluation 1986Ma45, but a justification for this
216AT4cN assignment is not given.
216AT cN NR$I{-|g} given per 1000 |a decays in 1996Sh05.
216AT G 34.6 2 0.07 2
216ATX G %IG=0.0070 20
216AT G 75.7 1 0.3 1
216ATX G %IG=0.030 10
216AT G 138.3 2 0.23 5
216ATX G %IG=0.023 5
216AT G 139.7 1 0.31 5
216ATX G %IG=0.031 5
216AT G 218.6 4 0.10 3
216ATX G %IG=0.0100 30
216AT G 222.2 5 0.08 3
216ATX G %IG=0.0080 30
216AT G 242.0 3 0.09 3
216ATX G %IG=0.0090 30
216AT G 336.0 10 0.05 2
216ATX G %IG=0.0050 20
216AT G 410.0 10 0.05 2
216ATX G %IG=0.0050 20
216AT L 0.0 1(-) 0.30 MS 3 A
216AT A 6677 4 66 10 A
216AT L 44.59 4 (2)- A
216AT G 44.60 5 5.6 2 M1 24.60 35
216ATX G ELC=20 4 (1996Sh05)$%IG=0.558 20
216ATS G LC=18.73 27$MC=4.44 6$NC=1.150 17$OC=0.2463 35$PC=0.0340 5
216AT A 6633 4 12.2 37 A
216AT L 57.12 15 (4)- A
216AT G 12.5 [E2] S
216ATF G FLAG=A
216AT A 6620 3 1.6 250 A
216AT L 105.89 5 (0)- A
216AT G 61.3 1 0.7 1 E2 76.3 12
216ATX G EL1C+EL2C=54 15 (1996Sh05)$%IG=0.070 10
216ATS G LC=56.4 9$MC=15.10 24$NC=3.89 6$OC=0.761 12$PC=0.0757 12
216AT G 105.88 5 3.0 2 M1 10.27 14
216ATX G ELC=1.8 3 (1996Sh05)$%IG=0.299 20
216ATS G KC=8.30 12$LC=1.502 21$MC=0.356 5$NC=0.0921 13$OC=0.01973 28$
216ATS G PC=0.00272 4
216AT A 6573 4 9.0 29 A
216AT L 122.03 16 (5)- A
216AT G 64.9 1 0.5 1 M1 8.18 12
216ATX G ELC=11 4 (1996Sh05)$%IG=0.050 10
216ATS G LC=6.23 9$MC=1.476 22$NC=0.382 6$OC=0.0819 12$PC=0.01131 17
216AT A 6555 0.6 LT367 GT
216AT L 153.39 8 (2)- B
216AT G 96.4 0.4 LT (E2) 9.00 ?
216ATX G ELC > 3 (1996Sh05)
216ATS G LC=6.62$MC=1.77$NC+=0.608
216AT G 108.8 1 0.45 6 M1 9.51 14
216ATX G ELC=1.5 5 (1995Sh05)$%IG=0.045 6
216ATS G KC=7.69 11$LC=1.388 20$MC=0.329 5$NC=0.0852 12$OC=0.01824 26$
216ATS G PC=0.00252 4
216AT G 153.4 1 2.6 2 M1 3.58 5
216ATX G EKC=4.2 8 (1996Sh05)$%IG=0.259 20
216ATS G KC=2.90 4$LC=0.518 7$MC=0.1227 17$NC=0.0318 4$OC=0.00681 10$
216ATS G PC=0.000940 13
216AT A 6524.2 252.5 67
216AT L 160.73 5 (1)- B
216AT G 54.8 1 0.15 5 [M1] 13.43 20
216ATX G %IG=0.015 5
216ATS G LC=10.22 15$MC=2.42 4$NC=0.628 9$OC=0.1344 20$PC=0.01856 28
216AT G 116.2 1 0.35 5 M1 7.88 11
216ATX G EKC=14 5 (1996Sh05)$%IG=0.035 5
216ATS G KC=6.38 9$LC=1.148 16$MC=0.272 4$NC=0.0705 10$OC=0.01509 21$
216ATS G PC=0.002084 30
216AT G 160.73 5 3.8 2 M1 3.14 4
216ATX G EKC=3.8 7 (1996Sh05)$%IG=0.379 20
216ATS G KC=2.54 4$LC=0.454 6$MC=0.1075 15$NC=0.0278 4$OC=0.00596 8$
216ATS G PC=0.000823 12
216AT A 6516.5 253.0 52
216AT L 169.27 11 (3-) A
216AT G 112.1 2 0.05 2 [M1+E2] 6.8 20
216ATX G %IG=0.0050 20
216ATS G KC=3.7 33$LC=2.3 10$MC=0.58 28$NC=0.15 7$OC=0.030 14$PC=0.0034 11
216AT G 124.7 1 0.70 6 [M1+E2] 4.7 17
216ATX G %IG=0.070 6
216ATS G KC=2.8 24$LC=1.5 5$MC=0.38 15$NC=0.10 4$OC=0.020 7$PC=0.0022 5
216AT A 6508.6 250.6 242
216AT L 199.19 16 (3)- B
216AT G 45.8 S
216ATF G FLAG=A
216AT G 142.1 1 0.8 1 M1 4.45 6
216ATX G EKC=7.0 23 (1996Sh05)$%IG=0.080 10
216ATS G KC=3.60 5$LC=0.645 9$MC=0.1527 22$NC=0.0396 6$OC=0.00847 12$
216ATS G PC=0.001170 17
216AT G 154.5 3 0.4 1 M1 3.51 5
216ATX G EKC=4.5 12 (1996Sh05)$%IG=0.040 10
216ATS G KC=2.84 4$LC=0.508 8$MC=0.1203 18$NC=0.0312 5$OC=0.00667 10$
216ATS G PC=0.000921 14
216AT A 6480.1 250.6 184
216AT L 208.00 11 (1,2)-
216AT G 47.3 S
216ATF G FLAG=A
216AT G 163.4 1 1.8 2 M1 2.99 4
216ATX G EKC=2.7 5 (1996Sh05)$%IG=0.179 20
216ATS G KC=2.424 34$LC=0.433 6$MC=0.1025 14$NC=0.0266 4$OC=0.00569 8$
216ATS G PC=0.000786 11
216AT G 208.0 4 0.07 3 [M1+E2] 1.0 5
216ATX G %IG=0.0070 30
216ATS G KC=0.7 5$LC=0.213 7$MC=0.0535 18$NC=0.0138 5$OC=0.00285 5$PC=0.00035 5
216AT A 6471.5 251.3 78
216AT L 234.59 21 (1,2-)
216AT G 128.7 2 0.12 4
216ATX G %IG=0.012 4
216AT A 6444.8 250.01 AP7962 AP
216AT L 254.8 4
216AT G 132.8 3 0.07 3
216ATX G %IG=0.0070 30
216AT A 6427.6 200.24 275
216AT L 278.15 16 (4)- B
216AT G 156.1 1 1.1 2 M1 3.41 5
216ATX G EKC=4.4 10 (1996Sh05)$%IG=0.110 20
216ATS G KC=2.76 4$LC=0.493 7$MC=0.1168 16$NC=0.0303 4$OC=0.00648 9$
216ATS G PC=0.000895 13
216AT G 221.1 3 0.20 5 [M1+E2] 0.8 5
216ATX G %IG=0.020 5
216ATS G KC=0.6 5$LC=0.173 12$MC=0.0431 8$NC=0.01116 23$OC=0.00230 12$
216ATS G PC=0.00028 5
216AT G 233.6 2 0.35 6 [E2] 0.291 4
216ATX G %IG=0.035 6
216ATS G KC=0.1183 17$LC=0.1281 18$MC=0.0339 5$NC=0.00875 13$OC=0.001741 25$
216ATS G PC=0.0001862 27
216AT A 6402.1 201.25 42
216AT L 302.78 14 (1,2-)
216AT G 196.9 2 0.20 5
216ATX G %IG=0.020 5
216AT G 258.2 2 0.48 10
216ATX G %IG=0.048 10
216AT G 302.7 4 0.30 5
216ATX G %IG=0.030 5
216AT A 6378.2 200.35 120
216AT L 317 3
216AT cL E$From E{-|a}
216AT A 6363.9 250.01 3676
216AT L 381.08 22 (2-,3-)
216AT G 173.0 3 0.06 3
216ATX G %IG=0.0060 30
216AT G 182.1 4 0.05 2
216ATX G %IG=0.0050 20
216AT G 323.9 7 0.10 3
216ATX G %IG=0.0100 30
216AT G 381.0 5 0.32 5
216ATX G %IG=0.032 5
216AT A 6303.1 300.015 1329
216AT L 400 30 (9-) ?
216AT2 L %A=100
216AT cL %A$from systematics (1980Sc26)
216AT cL J$This |a group may feed the 250-keV, (9-) isomer in {+212}Bi, in
216AT2cL which case one predicts, on the basis of systematics (HF=2.2), a
216AT3cL 9{+-} isomer in {+216}At with T{-1/2}|?0.1 ms (1980Sc26)
216AT cL E$Based on the assumption that the 7960-keV |a observed in 1971Br13
216AT2cL populates the 239 keV {I30} state in {+212}Bi. This |a decay was
216AT3cL observed in the decay of an intense {+224}Ac source and has a T{-1/2}
216AT4cL characteristic of {+220}Fr. Additionally, it does not appear in
216AT5cL coincidence with {+212}Po |a decay, which indicates it cannot
216AT6cL originate from the |e+|b{++}-decay branch of {+224}Ac. However, its
216AT7cL placement is very tentative.
216AT L 421.5 4
216AT G 260.5 5 0.07 3
216ATX G %IG=0.0070 30
216AT G 268.3 4 0.09 3
216ATX G %IG=0.0090 30
216AT A 6260 0.005 LT2658 GT
216AT cA $From 1996Sh05
216AT L 479.3 ?
216AT G 318.6 4 0.25 5 ?
216ATX G %IG=0.025 5