Curium-237

Properties and data of the isotope ²³⁷Cm.

Content

General data

Name of the isotope:Curium-237; Cm-237Symbol:²³⁷Cm or 23796CmMass number A:237 (= number of nucleons)Atomic number Z:96 (= number of protons)Neutrons N:141Isotopic mass:237.05287(8) u (atomic weight of Curium-237)Nuclide mass:237.0002137 u (calculated nuclear mass without electrons)Mass excess:49.24809 MeVMass defect:1.920086228 u (per nucleus)Nuclear binding energy:1788.54880086 MeV (per nucleus)
7.54661941 MeV (average binding energy per nucleon)Separation energy:S_N = 6.68(70) MeV (first neutron)
S_P = 4.08(13) MeV (first proton)Half-life:~ 20 minDecay constant λ:0.00057762265046662 s^-1Specific activity α:1.467732052742 × 10⁺¹⁸ Bq g^-1
39668433.857908 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2002

Parent Nuclides

Direct parent isotope is: ²⁴¹Cf.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 141) and isobaric (same nucleon number A = 237) with Curium-237. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 141	Isobar A = 237
83	²²⁴Bi
84	²²⁵Po
85	²²⁶At
86	²²⁷Rn
87	²²⁸Fr
88	²²⁹Ra
89	²³⁰Ac
90	²³¹Th	²³⁷Th
91	²³²Pa	²³⁷Pa
92	²³³U	²³⁷U
93	²³⁴Np	²³⁷Np
94	²³⁵Pu	²³⁷Pu
95	²³⁶Am	²³⁷Am
96	²³⁷Cm	²³⁷Cm
97	²³⁸Bk	²³⁷Bk
98	²³⁹Cf	²³⁷Cf
99	²⁴⁰Es
100	²⁴¹Fm