Rutherfordium-254

Properties and data of the isotope ²⁵⁴Rf.

Content

See also: list of Rutherfordium isotopes.

General data

Name of the isotope:Rutherfordium-254; Rf-254Symbol:²⁵⁴Rf or 254104RfMass number A:254 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:150Isotopic mass:254.10005(30) u (atomic weight of Rutherfordium-254)Nuclide mass:254.0430066 u (calculated nuclear mass without electrons)Mass excess:93.19597 MeVMass defect:2.013490728 u (per nucleus)Nuclear binding energy:1875.55453219 MeV (per nucleus)
7.38407296 MeV (average binding energy per nucleon)Separation energy:S_N = 8.43(50) MeV (first neutron)
S_P = 2.67(35) MeV (first proton)Half-life:23(3) μsDecay constant λ:30136.833937389 s^-1Specific activity α:7.145207048955 × 10⁺²⁵ Bq g^-1
1.931137040258 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1997

Radioactive Decay

Half-life T_½ = 23(3) μs respectively 2.3 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SZ	div.	> 98.5 %
α	²⁵⁰No	< 1.5 %	9.21(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 150) and isobaric (same nucleon number A = 254) with Rutherfordium-254. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 150	Isobar A = 254
92	²⁴²U
93	²⁴³Np
94	²⁴⁴Pu
95	²⁴⁵Am
96	²⁴⁶Cm
97	²⁴⁷Bk	²⁵⁴Bk
98	²⁴⁸Cf	²⁵⁴Cf
99	²⁴⁹Es	²⁵⁴Es
100	²⁵⁰Fm	²⁵⁴Fm
101	²⁵¹Md	²⁵⁴Md
102	²⁵²No	²⁵⁴No
103	²⁵³Lr	²⁵⁴Lr
104	²⁵⁴Rf	²⁵⁴Rf
105	²⁵⁵Db