Curium-250

Properties and data of the isotope ²⁵⁰Cm.

Content

General data

Name of the isotope:Curium-250; Cm-250Symbol:²⁵⁰Cm or 25096CmMass number A:250 (= number of nucleons)Atomic number Z:96 (= number of protons)Neutrons N:154Isotopic mass:250.078358(11) u (atomic weight of Curium-250)Nuclide mass:250.0257017 u (calculated nuclear mass without electrons)Mass excess:72.99001 MeVMass defect:2.007242136 u (per nucleus)Nuclear binding energy:1869.73400623 MeV (per nucleus)
7.47893602 MeV (average binding energy per nucleon)Separation energy:S_N = 5.832(10) MeV (first neutron)
S_P = 7.40(30) MeV (first proton)Half-life:8300 aDecay constant λ:2.648126764316 × 10^-12 s^-1Specific activity α:6378956955.8739 Bq g^-1
0.17240424205065 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1966

Radioactive Decay

Half-life T_½ = 8300 a respectively 2.6175 × 10¹¹ seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	²⁵⁰Bk	ca. 8 %	40(11) MeV
α	²⁴⁶Pu	ca. 18 %	5.17(18) MeV
SZ	^div	ca. 74 %

Parent Nuclides

Direct parent isotope is: ²⁵⁴Cf.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 154) and isobaric (same nucleon number A = 250) with Curium-250. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 154	Isobar A = 250
95	²⁴⁹Am
96	²⁵⁰Cm	²⁵⁰Cm
97	²⁵¹Bk	²⁵⁰Bk
98	²⁵²Cf	²⁵⁰Cf
99	²⁵³Es	²⁵⁰Es
100	²⁵⁴Fm	²⁵⁰Fm
101	²⁵⁵Md	²⁵⁰Md
102	²⁵⁶No	²⁵⁰No
103	²⁵⁷Lr
104	²⁵⁸Rf
105	²⁵⁹Db
106	²⁶⁰Sg
107	²⁶¹Bh