Nobelium-260

Properties and data of the isotope ²⁶⁰No.

Contents

General data

Name of the isotope:Nobelium-260; No-260Symbol:²⁶⁰No or 260102NoMass number A:260 (= number of nucleons)Atomic number Z:102 (= number of protons)Neutrons N:158Isotopic mass:260.10264(21) u (atomic weight of Nobelium-260)Nuclide mass:260.0466933 u (calculated nuclear mass without electrons)Mass excess:95.60854 MeVMass defect:2.064569992 u (per nucleus)Nuclear binding energy:1923.13456013 MeV (per nucleus)
7.39667139 MeV (average binding energy per nucleon)Separation energy:S_N = 6.54(20) MeV (first neutron)
S_P = 5.30(28) MeV (first proton)Half-life:106(8) msDecay constant λ:6.5391243449051 s^-1Specific activity α:1.514597227140 × 10⁺²² Bq g^-1
409350601929.95 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1985

Radioactive Decay

Half-life T_½ = 106(8) ms respectively 1.06 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SZ	div.	100 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 158) and isobaric (same nucleon number A = 260) with Nobelium-260. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 158	Isobar A = 260
98	²⁵⁶Cf
99	²⁵⁷Es
100	²⁵⁸Fm
101	²⁵⁹Md	²⁶⁰Md
102	²⁶⁰No	²⁶⁰No
103	²⁶¹Lr	²⁶⁰Lr
104	²⁶²Rf	²⁶⁰Rf
105	²⁶³Db	²⁶⁰Db
106	²⁶⁴Sg	²⁶⁰Sg
107	²⁶⁵Bh	²⁶⁰Bh
108	²⁶⁶Hs
109	²⁶⁷Mt
110	²⁶⁸Ds