Manganese-46m

Properties and data of the isotope ^46mMn.

Contents

See also: List of individual Manganese isotopes (and general data sources).

General data

Name of the isotope:Manganese-46m; Mn-46mSymbol:^46mMn or 46m25MnMass number A:46 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:21Isotopic mass:45.98651(43) u (atomic weight of Manganese-46m)
Excitation energy: 150(100) keVNuclide mass:45.9727958 u (calculated nuclear mass without electrons)Mass excess:-12.56585 MeVMass defect:0.391079036 u (per nucleus)Nuclear binding energy:364.28777556 MeV (per nucleus)
7.91929947 MeV (average binding energy per nucleon)Half-life:1 msDecay constant λ:693.14718055995 s^-1Specific activity α:9.276066573333 × 10⁺²⁴ Bq g^-1
2.507045019819 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)1-~

Radioactive Decay

Half-life T_½ = 1 ms respectively 1 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁴⁶Cr		17.1 MeV

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
⁴⁶Mn		36.2(4) ms	(4+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 46) with Manganese-46m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 21	Isobar A = 46
9	³⁰F
10	³¹Ne
11	³²Na
12	³³Mg
13	³⁴Al
14	³⁵Si
15	³⁶P	⁴⁶P
16	³⁷S	⁴⁶S
17	³⁸Cl	⁴⁶Cl
18	³⁹Ar	⁴⁶Ar
19	⁴⁰K	⁴⁶K
20	⁴¹Ca	⁴⁶Ca
21	⁴²Sc	⁴⁶Sc
22	⁴³Ti	⁴⁶Ti
23	⁴⁴V	⁴⁶V
24	⁴⁵Cr	⁴⁶Cr
25	⁴⁶Mn	⁴⁶Mn
26	⁴⁷Fe	⁴⁶Fe
27	⁴⁸Co	⁴⁶Co
28	⁴⁹Ni