Manganese-64

Properties and data of the isotope ⁶⁴Mn.

Content

General data

Name of the isotope:Manganese-64; Mn-64Symbol: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-64)Nuclide 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)Separation energy:S_N = 4.173(5) MeV (first neutron)
S_P = 14.27(36) MeV (first proton)Half-life:90(4) msDecay constant λ:7.7016353395549 s^-1Specific activity α:7.361957597883 × 10⁺²² Bq g^-1
1989718269698.3 Ci g^-1Spin and parity:
(nuclear angular momentum)(1+)Magnetic dipole moment:μ(μ_N) = +2.085(3)Nuclear g-factor:g_l = 2.085Year of discovery:1985

Radioactive Decay

Half-life T_½ = 90(4) ms respectively 9.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁴Fe	77 %	11.981(6) MeV
β^-, n	⁶³Fe	33 %	4.575(6) MeV

Parent Nuclides

Direct parent isotope is: ⁶⁴Cr.

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
^64mMn	175(10) keV	0.50(5) ms	(4+)

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-64. 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