Manganese-54

Properties and data of the isotope ⁵⁴Mn.

Contents

See also: List of individual Manganese isotopes (and general data sources).

General data

Name of the isotope:Manganese-54; Mn-54Symbol:⁵⁴Mn or 5425MnMass number A:54 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:29Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.16 (= neutron-proton ratio)Neutron excess (N-Z):4Isotopic mass:53.9403564(11) u (atomic weight of Manganese-54)Nuclide mass:53.9266422 u (calculated nuclear mass without electrons)Mass excess:-55.55766 MeVMass defect:0.506551964 u (per nucleus)Nuclear binding energy:471.85011515 MeV (per nucleus)
8.7379651 MeV (average binding energy per nucleon)Separation energy:S_N = 8.9388(11) MeV (first neutron)
S_P = 7.5596(10) MeV (first proton)Half-life:312.2(2) dDecay constant λ:2.569678671376 × 10^-8 s^-1Specific activity α:2.919805079962 × 10⁺¹⁴ Bq g^-1
7891.3650809803 Ci g^-1Spin and parity:
(nuclear angular momentum)3+Magnetic dipole moment:μ(μ_N) = 3.297(3)Quadrupole moment Q:0.37(3) barn (100 fm²)Nuclear g-factor:g_l = 1.099Charge radius:3.6834(49) femtometer fmMirror nucleus:Copper-54Year of discovery:1938

Radioactive Decay

Half-life T_½ = 312.2(2) d respectively 2.6974080 × 10⁷ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	⁵⁴Cr	99.99 %	1.3771(11) MeV
β^-	⁵⁴Fe	0.000093 %	0.6969(11) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 54) with Manganese-54. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 29	Isobar A = 54
13	⁴²Al
14	⁴³Si
15	⁴⁴P
16	⁴⁵S
17	⁴⁶Cl
18	⁴⁷Ar	⁵⁴Ar
19	⁴⁸K	⁵⁴K
20	⁴⁹Ca	⁵⁴Ca
21	⁵⁰Sc	⁵⁴Sc
22	⁵¹Ti	⁵⁴Ti
23	⁵²V	⁵⁴V
24	⁵³Cr	⁵⁴Cr
25	⁵⁴Mn	⁵⁴Mn
26	⁵⁵Fe	⁵⁴Fe
27	⁵⁶Co	⁵⁴Co
28	⁵⁷Ni	⁵⁴Ni
29	⁵⁸Cu	⁵⁴Cu
30	⁵⁹Zn	⁵⁴Zn
31	⁶⁰Ga
32	⁶¹Ge
33	⁶²As
34	⁶³Se