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Chromium-45

Properties and data of the isotope 45Cr.


Content

See also: list of Chromium isotopes.

 

General data

Name of the isotope:Chromium-45; Cr-45Symbol:45Cr or 4524CrMass number A:45 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:21Isotopic mass:44.97905(4) u (atomic weight of Chromium-45)Nuclide mass:44.9658844 u (calculated nuclear mass without electrons)Mass excess:-19.5148 MeVMass defect:0.390714004 u (per nucleus)Nuclear binding energy:363.94775044 MeV (per nucleus)
8.08772779 MeV (average binding energy per nucleon)
Separation energy:SN = 14.23(30) MeV (first neutron)
SP = 2.69(19) MeV (first proton)
Half-life:60.9(4) msDecay constant λ:11.381727102791 s-1Specific activity α:1.557780996417 × 10+23 Bq g-1
4210218909236.2 Ci g-1
Spin and parity:
(nuclear angular momentum)
(7/2-)Isobaric spin: 3/2Mirror nucleus:Scandium-45Year of discovery:1974

 

Radioactive Decay

Half-life T½ = 60.9(4) ms respectively 6.09 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β+45V65.6 %12.47(49) MeV
β+, p44Ti34.4 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
45mCr500.001 s~3/2+~

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 45) with Chromium-45. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 21Isobar A = 45
930F
1031Ne
1132Na
1233Mg
1334Al
1435Si
1536P45P
1637S45S
1738Cl45Cl
1839Ar45Ar
1940K45K
2041Ca45Ca
2142Sc45Sc
2243Ti45Ti
2344V45V
2445Cr45Cr
2546Mn45Mn
2647Fe45Fe
2748Co
2849Ni

 

External data and identifiers

Adopted Levels, Gammas:NuDat 45Cr

 


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Last update: 2023-10-04


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