Rutherfordium-260

Properties and data of the isotope ²⁶⁰Rf.

Content

See also: list of Rutherfordium isotopes.

General data

Name of the isotope:Rutherfordium-260; Rf-260Symbol:²⁶⁰Rf or 260104RfMass number A:260 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:156Isotopic mass:260.10644(22) u (atomic weight of Rutherfordium-260)Nuclide mass:260.0493966 u (calculated nuclear mass without electrons)Mass excess:99.14822 MeVMass defect:2.059090224 u (per nucleus)Nuclear binding energy:1918.03018911 MeV (per nucleus)
7.37703919 MeV (average binding energy per nucleon)Separation energy:S_N = 7.29(21) MeV (first neutron)
S_P = 3.99(21) MeV (first proton)Half-life:21(1) msDecay constant λ:33.007008598093 s^-1Specific activity α:7.645109813186 × 10⁺²² Bq g^-1
2066245895455.9 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1985

Radioactive Decay

Half-life T_½ = 21(1) ms respectively 2.1 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SF	^div.	≤ 100 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 156) and isobaric (same nucleon number A = 260) with Rutherfordium-260. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 156	Isobar A = 260
96	²⁵²Cm
97	²⁵³Bk
98	²⁵⁴Cf
99	²⁵⁵Es
100	²⁵⁶Fm
101	²⁵⁷Md	²⁶⁰Md
102	²⁵⁸No	²⁶⁰No
103	²⁵⁹Lr	²⁶⁰Lr
104	²⁶⁰Rf	²⁶⁰Rf
105	²⁶¹Db	²⁶⁰Db
106	²⁶²Sg	²⁶⁰Sg
107	²⁶³Bh	²⁶⁰Bh
108	²⁶⁴Hs