Rutherfordium-259

Properties and data of the isotope ²⁵⁹Rf.

Content

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Rutherfordium isotopes.

General data

Name of the isotope:Rutherfordium-259; Rf-259Symbol:²⁵⁹Rf or 259104RfMass number A:259 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:155Isotopic mass:259.10560(8) u (atomic weight of Rutherfordium-259)Nuclide mass:259.0485566 u (calculated nuclear mass without electrons)Mass excess:98.36577 MeVMass defect:2.051265308 u (per nucleus)Nuclear binding energy:1910.74132681 MeV (per nucleus)
7.37737964 MeV (average binding energy per nucleon)Separation energy:S_N = 6.05(8) MeV (first neutron)
S_P = 3.71(12) MeV (first proton)Half-life:2.4(4) sDecay constant λ:0.28881132523331 s^-1Specific activity α:6.715299160231 × 10⁺²⁰ Bq g^-1
18149457189.815 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1969

Radioactive Decay

Half-life T_½ = 2.4(4) s.

Decay mode	Daughter	Probability	Decay energy
α	²⁵⁵No	92(2) %	9.13(7) MeV
SZ	div.	8(2) %
EE	²⁵⁹Lr	15(4) %	2,51(10) MeV

Parent Nuclides

Direct parent isotope is: ²⁶³Sg.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 155) and isobaric (same nucleon number A = 259) with Rutherfordium-259. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 155	Isobar A = 259
96	²⁵¹Cm
97	²⁵²Bk
98	²⁵³Cf
99	²⁵⁴Es
100	²⁵⁵Fm	²⁵⁹Fm
101	²⁵⁶Md	²⁵⁹Md
102	²⁵⁷No	²⁵⁹No
103	²⁵⁸Lr	²⁵⁹Lr
104	²⁵⁹Rf	²⁵⁹Rf
105	²⁶⁰Db	²⁵⁹Db
106	²⁶¹Sg	²⁵⁹Sg
107	²⁶²Bh
108	²⁶³Hs