Manganese-61

Properties and data of the isotope ⁶¹Mn.

Content

General data

Name of the isotope:Manganese-61; Mn-61Symbol:⁶¹Mn or 6125MnMass number A:61 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:36Isotopic mass:60.9444525(25) u (atomic weight of Manganese-61)Nuclide mass:60.9307383 u (calculated nuclear mass without electrons)Mass excess:-51.74216 MeVMass defect:0.563110276 u (per nucleus)Nuclear binding energy:524.53384343 MeV (per nucleus)
8.59891547 MeV (average binding energy per nucleon)Separation energy:S_N = 6.845(3) MeV (first neutron)
S_P = 12.36(19) MeV (first proton)Half-life:709(8) msDecay constant λ:0.97764059317341 s^-1Specific activity α:9.812482270803 × 10⁺²¹ Bq g^-1
265202223535.24 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Magnetic dipole moment:μ(μ_N) = +3.533(2)Nuclear g-factor:g_l = 1.4132Year of discovery:1980

Radioactive Decay

Half-life T_½ = 709(8) ms respectively 7.09 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶¹Fe	100 %	7.178(3) MeV

Parent Nuclides

Direct parent isotope is: ⁶¹Cr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 36) and isobaric (same nucleon number A = 61) with Manganese-61. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 36	Isobar A = 61
19	⁵⁵K
20	⁵⁶Ca
21	⁵⁷Sc	⁶¹Sc
22	⁵⁸Ti	⁶¹Ti
23	⁵⁹V	⁶¹V
24	⁶⁰Cr	⁶¹Cr
25	⁶¹Mn	⁶¹Mn
26	⁶²Fe	⁶¹Fe
27	⁶³Co	⁶¹Co
28	⁶⁴Ni	⁶¹Ni
29	⁶⁵Cu	⁶¹Cu
30	⁶⁶Zn	⁶¹Zn
31	⁶⁷Ga	⁶¹Ga
32	⁶⁸Ge	⁶¹Ge
33	⁶⁹As
34	⁷⁰Se
35	⁷¹Br
36	⁷²Kr
37	⁷³Rb
38	⁷⁴Sr