Curium-245

Properties and data of the isotope ²⁴⁵Cm.

Contents

General data

Name of the isotope:Curium-245; Cm-245Symbol:²⁴⁵Cm or 24596CmMass number A:245 (= number of nucleons)Atomic number Z:96 (= number of protons)Neutrons N:149Isotopic mass:245.0654911(12) u (atomic weight of Curium-245)Nuclide mass:245.0128348 u (calculated nuclear mass without electrons)Mass excess:61.00457 MeVMass defect:1.976784456 u (per nucleus)Nuclear binding energy:1841.36286006 MeV (per nucleus)
7.51576678 MeV (average binding energy per nucleon)Separation energy:S_N = 5.5186(5) MeV (first neutron)
S_P = 6.1636(11) MeV (first proton)Half-life:8423(74) aDecay constant λ:2.60944614900 × 10^-12 s^-1Specific activity α:6414062153.3559 Bq g^-1
0.17335303117178 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μ_N) = 0.40(8)Nuclear g-factor:g_l = 0.11428571428571Charge radius:5.8475(182) femtometer fmYear of discovery:1954

Radioactive Decay

Half-life T_½ = 8423(74) a respectively 2.6563 × 10¹¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁴¹Pu	ca. 100 %	5.6245(5) MeV
SZ	^div	trace

Parent Nuclides

Direct parent isotopes are: ²⁴⁹Cf, ²⁴⁵Bk, ²⁴⁵Am.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^245mCm	355.92(10) keV	0.29(2) μs	1/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 149) and isobaric (same nucleon number A = 245) with Curium-245. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 149	Isobar A = 245
91	²⁴⁰Pa
92	²⁴¹U
93	²⁴²Np
94	²⁴³Pu	²⁴⁵Pu
95	²⁴⁴Am	²⁴⁵Am
96	²⁴⁵Cm	²⁴⁵Cm
97	²⁴⁶Bk	²⁴⁵Bk
98	²⁴⁷Cf	²⁴⁵Cf
99	²⁴⁸Es	²⁴⁵Es
100	²⁴⁹Fm	²⁴⁵Fm
101	²⁵⁰Md	²⁴⁵Md
102	²⁵¹No
103	²⁵²Lr
104	²⁵³Rf