Manganese-55

Properties and data of the isotope ⁵⁵Mn.

Contents

General data

Name of the isotope:Manganese-55; Mn-55Symbol:⁵⁵Mn or 5525MnMass number A:55 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:30Isotopic mass:54.938044(3) u (atomic weight of Manganese-55)Nuclide mass:54.9243298 u (calculated nuclear mass without electrons)Mass excess:-57.71164 MeVMass defect:0.51752928 u (per nucleus)Nuclear binding energy:482.07541914 MeV (per nucleus)
8.76500762 MeV (average binding energy per nucleon)Separation energy:S_N = 10.2261(10) MeV (first neutron)
S_P = 8.0666(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = +3.4669(6)Charge radius:3.7057(22) femtometer fmMirror nucleus:Zinc-55Year of discovery:1923

Parent Nuclides

Direct parent isotopes are: ⁵⁵Fe, ⁵⁵Cr.

Occurrence

Comparison of the natural Manganese isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Manganese Isotopic mixture	54.938043 u	100 %
Isotope ⁵⁵Mn	54.938044(3) u	100 %	stable	5/2-

NMR data

Nuclear magnetic properties of the NMR active Nuclide ⁵⁵Mn

Isotope:⁵⁵Mn-NMRQuantity:100 %Spin:5/2-Nuclearmagnetic moment
μ/μ_N:+3.4669(6)Gyromagnetic ratio γ:6.608 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 1.38676Quadrupole moment Q:+ 0.33(1) barn (100 fm²)Resonance frequency:v₀ = 10.5763 at 1 TRelative Sensitivity:0.17881 (H₀ = const.)
2.8981 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 55) with Manganese-55. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 30	Isobar A = 55
13	⁴³Al
14	⁴⁴Si
15	⁴⁵P
16	⁴⁶S
17	⁴⁷Cl
18	⁴⁸Ar
19	⁴⁹K	⁵⁵K
20	⁵⁰Ca	⁵⁵Ca
21	⁵¹Sc	⁵⁵Sc
22	⁵²Ti	⁵⁵Ti
23	⁵³V	⁵⁵V
24	⁵⁴Cr	⁵⁵Cr
25	⁵⁵Mn	⁵⁵Mn
26	⁵⁶Fe	⁵⁵Fe
27	⁵⁷Co	⁵⁵Co
28	⁵⁸Ni	⁵⁵Ni
29	⁵⁹Cu	⁵⁵Cu
30	⁶⁰Zn	⁵⁵Zn
31	⁶¹Ga
32	⁶²Ge
33	⁶³As
34	⁶⁴Se