Manganese-69

Properties and data of the isotope ⁶⁹Mn.

Content

General data

Name of the isotope:Manganese-69; Mn-69Symbol:⁶⁹Mn or 6925MnMass number A:69 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:44Isotopic mass:68.97341(43) u (atomic weight of Manganese-69)Nuclide mass:68.9596958 u (calculated nuclear mass without electrons)Mass excess:-24.76843 MeVMass defect:0.60347210400001 u (per nucleus)Nuclear binding energy:562.13064404 MeV (per nucleus)
8.14682093 MeV (average binding energy per nucleon)Separation energy:S_N = 4.46(56) MeV (first neutron)
S_P = 17.26(64) MeV (first proton)Half-life:16(3) msDecay constant λ:43.321698784997 s^-1Specific activity α:3.836608417279 × 10⁺²³ Bq g^-1
10369211938593 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1995

Radioactive Decay

Half-life T_½ = 16(3) ms respectively 1.6 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁹Fe	100 %	14.26(56) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 69) with Manganese-69. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 44	Isobar A = 69
23	⁶⁷V
24	⁶⁸Cr
25	⁶⁹Mn	⁶⁹Mn
26	⁷⁰Fe	⁶⁹Fe
27	⁷¹Co	⁶⁹Co
28	⁷²Ni	⁶⁹Ni
29	⁷³Cu	⁶⁹Cu
30	⁷⁴Zn	⁶⁹Zn
31	⁷⁵Ga	⁶⁹Ga
32	⁷⁶Ge	⁶⁹Ge
33	⁷⁷As	⁶⁹As
34	⁷⁸Se	⁶⁹Se
35	⁷⁹Br	⁶⁹Br
36	⁸⁰Kr	⁶⁹Kr
37	⁸¹Rb
38	⁸²Sr
39	⁸³Y
40	⁸⁴Zr
41	⁸⁵Nb
42	⁸⁶Mo
43	⁸⁷Tc
44	⁸⁸Ru
45	⁸⁹Rh
46	⁹⁰Pd