212FR 216AC A DECAY (440 US) 2004Ku24 20NDS 202009
212FR H TYP=FUL$AUT=K. Auranen and E.A. McCutchan$CIT=NDS 168, 117 (2020)$
212FR2 H CUT=1-Aug-2020$
212FR c 2004Ku24: the nuclei of interest were produced in the
212FR2c fusion-evaporation reaction {+209}Bi({+12}C,5n). The 240-|mg/cm{+2}
212FR3c thick targets had a 40-|mg/cm{+2} thick carbon backing. The {+12}C
212FR4c beam was provided by the UNILAC accelerator at the energy of 7.1
212FR5c MeV/nucleon and at the intensity of |?200 pnA. Residues were selected
212FR6c with the velocity filter SHIP, and those were implanted into 16-strip
212FR7c PIPS Si detector with a HPGe detector mounted immediately behind.
212FR8c E|g, E|a, I|g, I|a, |g|a coincidences were measured.
212FR c Others: 1968Va18, 1970To18, 2000He17, 2005Li17, 2018Hu13
212FR cA E$From 2004Ku24
212FR cA IA$Deduced indirectly by 2004Ku24 from |a|g coincidences by
212FR2cA normalizing the number of |g-ray counts to those of |a- and |g-lines
212FR3cA observed for the 853 and 938 levels (which yielded identical values),
212FR4cA unless stated otherwise. Uncertainties for intensities obtained by
212FR5cA this method are statistical only. Plausible effect due to summing of
212FR6cA |a-particle and conversion electrons were not taken into account,
212FR7cA meaning the quoted I{-|a} values are lower or upper limits as
212FR8cA indicated.
212FR cL E$From a least-square fit to the E|g data by the evaluator
212FR cL J,T$From the Adopted Levels.
212FR cA HF$r{-0}({+212}Fr)=1.5043 {I22}, average of r{-0}({+212}Ra)=1.4695
212FR2cA {I14}, r{-0}({+214}Ra)=1.5487 {I30}, r{-0}({+210}Rn)=1.4557 {I12}, and
212FR3cA r{-0}({+212}Rn)=1.5433 {I36} (2020Si16).
212FR c $The {+212}Fr level scheme and {+216}Ac |a-decay data adopted here
212FR2c follows that presented in 2004Ku24.
212FR c In the previous A=212 evaluation (2005Br03) four excited states were
212FR2c adopted for {+212}Fr based on |a feeding from a low-lying (47 keV
212FR3c {I11}), high-spin (9{+-}) isomeric state of {+216m}Ac with a
212FR4c half-life nearly identical to that of the {+216}Ac ground state, see,
212FR5c i.e. 1968Va18, 1970To18, 2000He17. Later, in 2004Ku24, based on |a|g
212FR6c coincidence measurement it was obseved that all Q{-|a}+E{-|g} sums
212FR7c are equal to the Q{-|a} of the g.s. to g.s. |a decay, and that a
212FR8c change in beam energy did not have an impact on the relative
212FR9c population of the {+216}Ac ground state and assumed isomer.
212FRac Furthermore, in 2004Ku24 it was pointed out that the obtained
212FRbc |a-decay hindrance factors do not support high-spin origin, but
212FRcc instead all observed |a decays can be explained by the (1{+-}) ground
212FRdc state of {+216}Ac. Consequently, the assignment of a high-spin isomer
212FRec in {+216}Ac is considered erroneous, and the respective {+212}Fr
212FRfc levels, as well as the corresponding {+216m}Ac |a-decay data set were
212FRgc removed in the present evaluation.
212FR cG E,RI$From 2004Ku24. Intensities are normalized to 100 for the most
212FR2cG intense |g-ray from each level.
212FR cG M$From the Adopted Levels. For cases where the multipolarity derives
212FR2cG from this dataset, supporting evidence is given in the comments.
212FR D CC$FROM BrIcc v2.3b (16-Dec-2014) 2008Ki07, "Frozen Orbitals" appr.
216AC P 0.0 (1-) 440 US 16 9235 6
216AC cP T$from 2000He17. Other: 390 |ms {I60} (2005Li17)
216AC cP J$analogy with {+212}At and {+214}Fr
212FR N 1
212FR PN 7
212FR G 406.2 1
212FR G 617.3 3
212FR G 765.3 2
212FR G 1081.3 3
212FR L 0.0 5+ 20.0 M 6
212FR A 9105 7 47.5 5 235 14
212FR cA IA$deduced from the singles |a-spectrum by assuming the tail in the
212FR2cA 9029 |a transition towards higher energy is due to summing of 9029
212FR3cA keV |a-particles and conversion electrons from the 82 keV transition.
212FR4cA Other: 75 {I57} (2018Hu13).
212FR cA E$Others: 9052 keV {I10} (2000He17), 9070 {I50} (2005Li17),
212FR2cA 9070 keV {I8} (1970To18), 9069 {I6} (2018Hu13)
212FR L 82.48 6 (4+)
212FR G 82.6 1 100 C
212FR A 9029 7 48.8 10145 9
212FR cA IA$deduced from the singles |a-spectrum by assuming the tail in the
212FR2cA 9029 |a transition towards higher energy is due to summing of 9029
212FR3cA keV |a-particles and conversion electrons from the 82 keV transition.
212FR4cA Other: 25 {I28} (2018Hu13)
212FR cA E$others: 8990 keV {I20} (1970To18), 8976 {I10} (2018Hu13)
212FR L 500.72 7
212FR G 418.3 1 100 6 C
212FR G 500.7 1 53 4
212FR A 8616 6 0.23 5 2.69E3 61
212FR cA IA$from the singles |a-spectrum.
212FR L 536.34 8
212FR G 453.9 1 9 1 C
212FR G 536.3 1 100 6
212FR A 8581 6 0.51 GT1.03E3 LT
212FR cA IA$|DI|a=0.06
212FR L 542.00 10 7+
212FR G 542.0 1 100 E2 0.0305
212FR A 8576 6 0.46 GT1108 LT
212FR cA IA$|DI|a=0.05
212FR L 574.89 11
212FR G 492.4 1 100 4 C ?
212FR G 575.0 4 1.3 4 ?
212FR A 8536 150.12 GT3474 LT
212FR cA IA$|DI|a=0.02
212FR L 606.23 8
212FR G 105.8 2 11 3 C
212FR G 523.7 1 100 7 C
212FR G 606.2 1 60 7
212FR A 8514 6 0.11 GT3125 LT
212FR cA IA$|DI|a=0.02
212FR L 610.60 20
212FR G 610.6 2 100
212FR A 8509 7 0.017 GT19684 LT
212FR cA IA$|DI|a=0.001
212FR L 777.29 10
212FR G 276.6 2 1.3 6
212FR G 694.8 1 100 5 C
212FR G 777.3 2 14 2
212FR A 8346 7 0.1 LT1050 GT
212FR L 853.73 8 (4+,5+,6+)
212FR G 352.9 2 1.2 5 C
212FR G 771.3 1 77 4 C
212FR G 853.7 1 100 4 (M1) 0.0397
212FRX G EKC=0.06 6
212FRS G KC=0.0322 5$LC=0.00569 8$MC=0.001348 19$NC=0.000353 5$OC=7.90E-5 11$
212FRS G PC=1.269E-5 18$QC=7.13E-7 10
212FR cG EKC$deduced by gating on |a-particles with energies between 8230 and
212FR2cG 8320.
212FR A 8270 5 1.40 7 49 4
212FR cA IA$from the singles |a-spectrum.
212FR L 938.21 10 (4+,5+,6+)
212FR G 855.8 7 5 LE C
212FR G 938.2 1 100 2 (M1) 0.0310
212FRX G EKC=0.027 17
212FRS G KC=0.0252 4$LC=0.00443 7$MC=0.001051 15$NC=0.000275 4$OC=6.16E-5 9$
212FRS G PC=9.90E-6 14$QC=5.57E-7 8
212FR cG EKC$deduced from ratio between L{-|a1} x-rays and 938 |g-rays gated
212FR2cG by the 8187 |a-transition.
212FR A 8187 5 0.74 2 53 4
212FR cA IA$from the singles |a-spectrum.
212FR L 1008.7 4
212FR G 1008.7 4 100
212FR A 8114 9 0.0020 GT13023 LT
212FR cA IA$|DI|a=0.0003
212FR L 1129.9 5
212FR G 1047.5 9 85 50
212FR G 1129.9 5 100 40
212FR A 8001 150.0024 GT4792 LT
212FR cA IA$|DI|a=0.0016
212FR L 1209.5 5
212FR G 1209.5 5 100
212FR A 7924 150.0013 GT5116 LT
212FR cA IA$|DI|a=0.0002
212FR L 1239.9 4
212FR G 1239.9 4 100
212FR A 7892 100.021 2 242 27
212FR cA IA$from the singles |a-spectrum.
212FR L 1287.1 8
212FR G 1287.1 8 100
212FR A 7846 150.016 3 229 45
212FR cA IA$from the singles |a-spectrum.
212FR L 1356.0 20
212FR G 1356 2 100
212FR A 7776 150.0010 GT2372 LT
212FR cA IA$|DI|a=0.0004
212FR L 1375.35 23
212FR G 436.8 6 17 6
212FR G 1293.1 4 45 17
212FR G 1375.3 3 100 20
212FR A 7758 6 0.011 3 177 50
212FR cA IA$from the singles |a-spectrum.