Manganese-50

Properties and data of the isotope ⁵⁰Mn.

Contents

General data

Name of the isotope:Manganese-50; Mn-50Symbol:⁵⁰Mn or 5025MnMass number A:50 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:25Isotopic mass:49.9542374(5) u (atomic weight of Manganese-50)Nuclide mass:49.9405232 u (calculated nuclear mass without electrons)Mass excess:-42.62759 MeVMass defect:0.4580113 u (per nucleus)Nuclear binding energy:426.63477788 MeV (per nucleus)
8.53269556 MeV (average binding energy per nucleon)Separation energy:S_N = 13.0783(22) MeV (first neutron)
S_P = 4.5835(22) MeV (first proton)Half-life:283.19(10) msDecay constant λ:2.4476400316393 s^-1Specific activity α:3.008170009173 × 10⁺²² Bq g^-1
813018921398.35 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Isobaric spin: 1Charge radius:3.7120(196) femtometer fmYear of discovery:1952

Radioactive Decay

Half-life T_½ = 283.19(10) ms respectively 2.8319 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁵⁰Cr	100 %	7.6345(6) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁰Fe.

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
^50mMn	225.28(9) keV	1.75(3) min	5+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 50) with Manganese-50. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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