Chromium-44

Properties and data of the isotope ⁴⁴Cr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Chromium isotopes (and general data sources).

General data

Name of the isotope:Chromium-44; Cr-44Symbol:⁴⁴Cr or 4424CrMass number A:44 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:20Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):0.83333333333333 (= neutron-proton ratio)Neutron excess (N-Z):-4Isotopic mass:43.98566(32) u (atomic weight of Chromium-44)Nuclide mass:43.9724944 u (calculated nuclear mass without electrons)Mass excess:-13.35762 MeVMass defect:0.375439088 u (per nucleus)Nuclear binding energy:349.71925784 MeV (per nucleus)
7.94816495 MeV (average binding energy per nucleon)Separation energy:S_N = 19.46(5) MeV (first neutron)
S_P = 2.73(39) MeV (first proton)Half-life:42.8(6) msDecay constant λ:16.195027583176 s^-1Specific activity α:2.268110170615 × 10⁺²³ Bq g^-1
6130027488148.9 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Calcium-44Year of discovery:1987

Radioactive Decay

Half-life T_½ = 42.8(6) ms respectively 4.28 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁴⁴V	93 %	10.76(35) MeV
EC, p	⁴³Ti	7(3) %

Parent Nuclides

Direct parent isotope is: ⁴⁵Mn.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 20) and isobaric (same nucleon number A = 44) with Chromium-44. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 20	Isobar A = 44
8	²⁸O
9	²⁹F
10	³⁰Ne
11	³¹Na
12	³²Mg
13	³³Al
14	³⁴Si	⁴⁴Si
15	³⁵P	⁴⁴P
16	³⁶S	⁴⁴S
17	³⁷Cl	⁴⁴Cl
18	³⁸Ar	⁴⁴Ar
19	³⁹K	⁴⁴K
20	⁴⁰Ca	⁴⁴Ca
21	⁴¹Sc	⁴⁴Sc
22	⁴²Ti	⁴⁴Ti
23	⁴³V	⁴⁴V
24	⁴⁴Cr	⁴⁴Cr
25	⁴⁵Mn	⁴⁴Mn
26	⁴⁶Fe
27	⁴⁷Co
28	⁴⁸Ni