Rutherfordium-263

Properties and data of the isotope ²⁶³Rf.

Content

See also: list of Rutherfordium isotopes.

General data

Name of the isotope:Rutherfordium-263; Rf-263Symbol:²⁶³Rf or 263104RfMass number A:263 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:159Isotopic mass:263.1125(2) u (atomic weight of Rutherfordium-263)Nuclide mass:263.0554566 u (calculated nuclear mass without electrons)Mass excess:104.79308 MeVMass defect:2.079024972 u (per nucleus)Nuclear binding energy:1936.59928727 MeV (per nucleus)
7.36349539 MeV (average binding energy per nucleon)Separation energy:S_N = 5.71(27) MeV (first neutron)
S_P = 4.63(25) MeV (first proton)Half-life:10(2) minDecay constant λ:0.0011552453009332 s^-1Specific activity α:2.645266133079 × 10⁺¹⁸ Bq g^-1
71493679.272427 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2003

Radioactive Decay

Half-life T_½ = 10(2) min (minutes) respectively 6 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SF	div.	?
α	²⁵⁹No	30 %	8.25(15) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 159) and isobaric (same nucleon number A = 263) with Rutherfordium-263. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 159	Isobar A = 263
100	²⁵⁹Fm
101	²⁶⁰Md
102	²⁶¹No
103	²⁶²Lr	²⁶³Lr
104	²⁶³Rf	²⁶³Rf
105	²⁶⁴Db	²⁶³Db
106	²⁶⁵Sg	²⁶³Sg
107	²⁶⁶Bh	²⁶³Bh
108	²⁶⁷Hs	²⁶³Hs
109	²⁶⁸Mt
110	²⁶⁹Ds