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Curium-245

Properties and data of the isotope 245Cm.


Contents

See also: list of Curium isotopes.

 

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:SN = 5.5186(5) MeV (first neutron)
SP = 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-1
Spin and parity:
(nuclear angular momentum)
7/2+Magnetic dipole moment:μ(μN) = 0.40(8)Nuclear g-factor:gl = 0.11428571428571Charge radius:5.8475(182) femtometer fmYear of discovery:1954

 

Radioactive Decay

Half-life T½ = 8423(74) a respectively 2.6563 × 1011 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
α241Puca. 100 %5.6245(5) MeV
SZdivtrace

 

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 IsomerExcitation EnergyHalf-lifeSpin
245mCm355.92(10) keV0.29(2) μs1/2+

 

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.

 

ZIsotone N = 149Isobar A = 245
91240Pa
92241U
93242Np
94243Pu245Pu
95244Am245Am
96245Cm245Cm
97246Bk245Bk
98247Cf245Cf
99248Es245Es
100249Fm245Fm
101250Md245Md
102251No
103252Lr
104253Rf

 

External data and identifiers

Adopted Levels, Gammas:NuDat 245Cm

 


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Last update: 2020-10-23


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