Rutherfordium-253
Properties and data of the isotope 253Rf.
See also: list of Rutherfordium isotopes.
General data
Name of the isotope:Rutherfordium-253; Rf-253Symbol:253Rf or 253104RfMass number A:253 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:149Isotopic mass:253.10044(44) u (atomic weight of Rutherfordium-253)Nuclide mass:253.0433966 u (calculated nuclear mass without electrons)Mass excess:93.55926 MeVMass defect:2.004435812 u (per nucleus)Nuclear binding energy:1867.11993226 MeV (per nucleus)
7.37992068 MeV (average binding energy per nucleon)Separation energy:
SP = 2.47(47) MeV (first proton)Half-life:11 (+3-6) msDecay constant λ:63.013380050904 s-1Specific activity α:1.499902967301 × 10+23 Bq g-1
4053791803517.6 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2+)Year of discovery:1997
Radioactive Decay
Half-life T½ = 11 (+3-6) ms respectively 1.1 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 249No | ? | 9.35(30) MeV | |
SZ | div | > 0 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
253mRf | +y keV | 48 (+17-10) μs | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 149) and isobaric (same nucleon number A = 253) with Rutherfordium-253. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 149 | Isobar A = 253 |
91 | 240Pa | |
92 | 241U | |
93 | 242Np | |
94 | 243Pu | |
95 | 244Am | |
96 | 245Cm | |
97 | 246Bk | 253Bk |
98 | 247Cf | 253Cf |
99 | 248Es | 253Es |
100 | 249Fm | 253Fm |
101 | 250Md | 253Md |
102 | 251No | 253No |
103 | 252Lr | 253Lr |
104 | 253Rf | 253Rf |
External data and identifiers
Last update: 2020-11-04
Perma link: https://www.chemlin.org/isotope/rutherfordium-253
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