Manganese-57

Properties and data of the isotope ⁵⁷Mn.

Content

General data

Name of the isotope:Manganese-57; Mn-57Symbol:⁵⁷Mn or 5725MnMass number A:57 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:32Isotopic mass:56.9382860(16) u (atomic weight of Manganese-57)Nuclide mass:56.9245718 u (calculated nuclear mass without electrons)Mass excess:-57.48622 MeVMass defect:0.534617112 u (per nucleus)Nuclear binding energy:497.99263213 MeV (per nucleus)
8.73671284 MeV (average binding energy per nucleon)Separation energy:S_N = 8.6460(15) MeV (first neutron)
S_P = 9.4902(16) MeV (first proton)Half-life:85.4(18) sDecay constant λ:0.0081164775241211 s^-1Specific activity α:8.728316238708 × 10⁺¹⁹ Bq g^-1
2359004388.8402 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = +3.481(2)Nuclear g-factor:g_l = 1.3924Year of discovery:1954

Radioactive Decay

Half-life T_½ = 85.4(18) s respectively 8.54 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁷Fe	100 %	2.6956(15) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁷Cr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 57) with Manganese-57. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 32	Isobar A = 57
16	⁴⁸S
17	⁴⁹Cl
18	⁵⁰Ar
19	⁵¹K
20	⁵²Ca	⁵⁷Ca
21	⁵³Sc	⁵⁷Sc
22	⁵⁴Ti	⁵⁷Ti
23	⁵⁵V	⁵⁷V
24	⁵⁶Cr	⁵⁷Cr
25	⁵⁷Mn	⁵⁷Mn
26	⁵⁸Fe	⁵⁷Fe
27	⁵⁹Co	⁵⁷Co
28	⁶⁰Ni	⁵⁷Ni
29	⁶¹Cu	⁵⁷Cu
30	⁶²Zn	⁵⁷Zn
31	⁶³Ga
32	⁶⁴Ge
33	⁶⁵As
34	⁶⁶Se
35	⁶⁷Br
36	⁶⁸Kr