Manganese-51

Properties and data of the isotope ⁵¹Mn.

Content

General data

Name of the isotope:Manganese-51; Mn-51Symbol:⁵¹Mn or 5125MnMass number A:51 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:26Isotopic mass:50.9482081(5) u (atomic weight of Manganese-51)Nuclide mass:50.9344939 u (calculated nuclear mass without electrons)Mass excess:-48.24384 MeVMass defect:0.472705516 u (per nucleus)Nuclear binding energy:440.32235192 MeV (per nucleus)
8.63377161 MeV (average binding energy per nucleon)Separation energy:S_N = 13.6876(3) MeV (first neutron)
S_P = 5.27078(3) MeV (first proton)Half-life:46.2(1) minDecay constant λ:0.0002500530954401 s^-1Specific activity α:3.011709926406 × 10⁺¹⁸ Bq g^-1
81397565.578565 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = +3.575(4)Nuclear g-factor:g_l = 1.43Mirror nucleus:Iron-51Year of discovery:1938

Radioactive Decay

Half-life T_½ = 46.2(1) min (minutes) respectively 2.772 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE β⁺	⁵¹Cr	100 %	3.2075(6) MeV

Parent Nuclides

Direct parent isotope is: ⁵¹Fe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 51) with Manganese-51. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 26	Isobar A = 51
11	³⁷Na
12	³⁸Mg
13	³⁹Al
14	⁴⁰Si
15	⁴¹P
16	⁴²S
17	⁴³Cl	⁵¹Cl
18	⁴⁴Ar	⁵¹Ar
19	⁴⁵K	⁵¹K
20	⁴⁶Ca	⁵¹Ca
21	⁴⁷Sc	⁵¹Sc
22	⁴⁸Ti	⁵¹Ti
23	⁴⁹V	⁵¹V
24	⁵⁰Cr	⁵¹Cr
25	⁵¹Mn	⁵¹Mn
26	⁵²Fe	⁵¹Fe
27	⁵³Co	⁵¹Co
28	⁵⁴Ni	⁵¹Ni
29	⁵⁵Cu
30	⁵⁶Zn