Chromium-49

Properties and data of the isotope ⁴⁹Cr.

Contents

General data

Name of the isotope:Chromium-49; Cr-49Symbol:⁴⁹Cr or 4924CrMass number A:49 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:25Isotopic mass:48.9513330(24) u (atomic weight of Chromium-49)Nuclide mass:48.9381674 u (calculated nuclear mass without electrons)Mass excess:-45.33302 MeVMass defect:0.453090668 u (per nucleus)Nuclear binding energy:422.0512387 MeV (per nucleus)
8.61329059 MeV (average binding energy per nucleon)Separation energy:S_N = 10.582(8) MeV (first neutron)
S_P = 8.1443(24) MeV (first proton)Half-life:42.3(1) minDecay constant λ:0.00027310763615443 s^-1Specific activity α:3.426443030929 × 10⁺¹⁸ Bq g^-1
92606568.403511 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Isobaric spin: 1/2Magnetic dipole moment:μ(μ_N) = 0.476(3)Nuclear g-factor:g_l = 0.1904Mirror nucleus:Manganese-49Year of discovery:1942

Radioactive Decay

Half-life T_½ = 42.3(1) min (minutes) respectively 2.538 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁴⁹V	100 %	2.6289(24) MeV

Parent Nuclides

Direct parent isotope is: ⁴⁹Mn.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 49) with Chromium-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 25	Isobar A = 49
11	³⁶Na
12	³⁷Mg
13	³⁸Al
14	³⁹Si
15	⁴⁰P
16	⁴¹S	⁴⁹S
17	⁴²Cl	⁴⁹Cl
18	⁴³Ar	⁴⁹Ar
19	⁴⁴K	⁴⁹K
20	⁴⁵Ca	⁴⁹Ca
21	⁴⁶Sc	⁴⁹Sc
22	⁴⁷Ti	⁴⁹Ti
23	⁴⁸V	⁴⁹V
24	⁴⁹Cr	⁴⁹Cr
25	⁵⁰Mn	⁴⁹Mn
26	⁵¹Fe	⁴⁹Fe
27	⁵²Co	⁴⁹Co
28	⁵³Ni	⁴⁹Ni
29	⁵⁴Cu
30	⁵⁵Zn