Manganese-64m

Properties and data of the isotope ⁶⁴Mn.

Content

General data

Name of the isotope:Manganese-64m; Mn-64mSymbol:⁶⁴Mn or 6425MnMass number A:64 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:39Isotopic mass:63.953849(4) u (atomic weight of Manganese-64m)
Excitation energy: 175(10) keVNuclide mass:63.9401348 u (calculated nuclear mass without electrons)Mass excess:-42.98938 MeVMass defect:0.579708524 u (per nucleus)Nuclear binding energy:539.99501185 MeV (per nucleus)
8.43742206 MeV (average binding energy per nucleon)Half-life:0.50(5) msDecay constant λ:1386.2943611199 s^-1Specific activity α:1.32515236761 × 10⁺²⁵ Bq g^-1
3.581492885456 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)(4+)

Radioactive Decay

Half-life T_½ = 0.50(5) ms respectively 5.0 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁶⁴Mn	100 %

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
⁶⁴Mn		90(4) ms	(1+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 39) and isobaric (same nucleon number A = 64) with Manganese-64m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 39	Isobar A = 64
21	⁶⁰Sc
22	⁶¹Ti
23	⁶²V	⁶⁴V
24	⁶³Cr	⁶⁴Cr
25	⁶⁴Mn	⁶⁴Mn
26	⁶⁵Fe	⁶⁴Fe
27	⁶⁶Co	⁶⁴Co
28	⁶⁷Ni	⁶⁴Ni
29	⁶⁸Cu	⁶⁴Cu
30	⁶⁹Zn	⁶⁴Zn
31	⁷⁰Ga	⁶⁴Ga
32	⁷¹Ge	⁶⁴Ge
33	⁷²As	⁶⁴As
34	⁷³Se	⁶⁴Se
35	⁷⁴Br
36	⁷⁵Kr
37	⁷⁶Rb
38	⁷⁷Sr
39	⁷⁸Y
40	⁷⁹Zr
42	⁸¹Mo