ADOPTED LEVELS, GAMMAS for 218Po
Authors: Balraj Singh, M.S. Basunia, Murray Martin Et Al., | Citation: Nucl. Data Sheets 160, 405 (2019) | Cutoff date: 30-Oct-2019
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=259 keV 12 | S(n)= 5598 keV 7 | S(p)= 7662 keV 18 | Q(α)= 6114.75 keV 9 | ||
Reference: 2017WA10 |
References: | |||
A | 218Bi β- decay (33 S) | B | 222Rn α decay (3.8222 d) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | AB | 0+ | 3.097 m 12 % β- = 0.020 2 % α = 99.980 2 | |||||
509.70 10 | AB | 2+ | 509.7 1 | 100 | [E2] | 0.0 | 0+ | |
676 4 ? | B | |||||||
935.20 15 | A | (4+) | 425.5 1 | 100 | [E2] | 509.70 | 2+ | |
1320.90 18 | A | (6+) | 385.7 1 | 100 | [E2] | 935.20 | (4+) | |
1583.90 20 | A | (8+) | 263.0 1 | 100 | [E2] | 1320.90 | (6+) | |
1757.9 3 | A | 174.5 9 437.0 2 | 5.0 25 100 50 | 1583.90 1320.90 | (8+) (6+) | |||
1858.70 20 | A | 537.8 1 | 100 | 1320.90 | (6+) | |||
1871.0 3 | A | 287.1 2 | 100 | 1583.90 | (8+) | |||
2002.2 6 | A | 418.3 5 | 100 | 1583.90 | (8+) | |||
2047.5 6 | A | 176.6 9 463.5 6 | 1.6 16 100 33 | 1871.0 1583.90 | (8+) | |||
2286.8 4 | A | 702.9 3 | 100 | 1583.90 | (8+) |
E(level): From a least-squares fit to Eγ data, by evaluators except where noted.
Jπ(level): From systematics of even-even nuclides in this mass region, unless otherwise stated
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
509.70 | 2+ | 509.7 1 | [E2] | 0.0307 | α=0.0307 | |
935.20 | (4+) | 425.5 1 | [E2] | 0.0478 | α=0.0478 | |
1320.90 | (6+) | 385.7 1 | [E2] | 0.0619 | α=0.0619 | |
1583.90 | (8+) | 263.0 1 | [E2] | 0.189 | α=0.189 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 0+ | 3.097 m 12 % β- = 0.020 2 % α = 99.980 2 | RMS nuclear charge radius relative to that of 210Po: δ|4r2|5(218Po,210Po)=+0.948 fm2 10(stat) 7(syst) (2015Fi07). |
Nuclide assignment: 218Po activity of 3 min first identified from decay of Ra by E. Rutherford and H.t. Barnes, Phil. Mag. 7, 202 (1904). See 2013Fr04 for a brief description of discovery of this isotope.
Theory references: consult NSR database (www.nndc.bnl.gov/nsr/) for 56 primary references for calculations of half-lives of radioactive decay modes, and 10 for nuclear structure
Q-value: S(2n)=9568.2 20; S(2p)=13700 200 (syst) (2017Wa10)