Manganese-68

Properties and data of the isotope ⁶⁸Mn.

Content

General data

Name of the isotope:Manganese-68; Mn-68Symbol:⁶⁸Mn or 6825MnMass number A:68 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:43Isotopic mass:67.96953(43) u (atomic weight of Manganese-68)Nuclide mass:67.9558158 u (calculated nuclear mass without electrons)Mass excess:-28.38262 MeVMass defect:0.598687188 u (per nucleus)Nuclear binding energy:557.6735235 MeV (per nucleus)
8.20108123 MeV (average binding energy per nucleon)Separation energy:S_N = 2.99(50) MeV (first neutron)
S_P = 16.99(56) MeV (first proton)Half-life:28(3) msDecay constant λ:24.755256448569 s^-1Specific activity α:2.225069273987 × 10⁺²³ Bq g^-1
6013700740505.9 Ci g^-1Spin and parity:
(nuclear angular momentum)>3Year of discovery:1995

Radioactive Decay

Half-life T_½ = 28(3) ms respectively 2.8 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁸Fe	100 %	15.11(54) MeV
β^-, n	⁶⁷Fe	?	9.16(48) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 68) with Manganese-68. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 43	Isobar A = 68
23	⁶⁶V
24	⁶⁷Cr	⁶⁸Cr
25	⁶⁸Mn	⁶⁸Mn
26	⁶⁹Fe	⁶⁸Fe
27	⁷⁰Co	⁶⁸Co
28	⁷¹Ni	⁶⁸Ni
29	⁷²Cu	⁶⁸Cu
30	⁷³Zn	⁶⁸Zn
31	⁷⁴Ga	⁶⁸Ga
32	⁷⁵Ge	⁶⁸Ge
33	⁷⁶As	⁶⁸As
34	⁷⁷Se	⁶⁸Se
35	⁷⁸Br	⁶⁸Br
36	⁷⁹Kr	⁶⁸Kr
37	⁸⁰Rb
38	⁸¹Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru