Rutherfordium-265

Properties and data of the isotope ²⁶⁵Rf.

Content

See also: list of Rutherfordium isotopes.

General data

Name of the isotope:Rutherfordium-265; Rf-265Symbol:²⁶⁵Rf or 265104RfMass number A:265 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:161Isotopic mass:265.11668(39) u (atomic weight of Rutherfordium-265)Nuclide mass:265.0596366 u (calculated nuclear mass without electrons)Mass excess:108.68672 MeVMass defect:2.092174804 u (per nucleus)Nuclear binding energy:1948.84827688 MeV (per nucleus)
7.35414444 MeV (average binding energy per nucleon)Separation energy:S_N = 5.46(51) MeV (first neutron)
S_P = 4.98(57) MeV (first proton)Half-life:1.0 minDecay constant λ:0.011552453009332 s^-1Specific activity α:2.625301860377 × 10⁺¹⁹ Bq g^-1
709541043.34524 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 1.0 min (minutes) respectively 6 × 10¹ 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 = 161) and isobaric (same nucleon number A = 265) with Rutherfordium-265. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 161	Isobar A = 265
103	²⁶⁴Lr	²⁶⁵Lr
104	²⁶⁵Rf	²⁶⁵Rf
105	²⁶⁶Db	²⁶⁵Db
106	²⁶⁷Sg	²⁶⁵Sg
107	²⁶⁸Bh	²⁶⁵Bh
108	²⁶⁹Hs	²⁶⁵Hs
109	²⁷⁰Mt
110	²⁷¹Ds
111	²⁷²Rg