Americium-246m2

Properties and data of the isotope ²⁴⁶Am.

Content

General data

Name of the isotope:Americium-246m2; Am-246m2Symbol:²⁴⁶Am or 24695AmMass number A:246 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:151Isotopic mass:246.069774(19) u (atomic weight of Americium-246m2)
Excitation energy: 2000 keVNuclide mass:246.0176661 u (calculated nuclear mass without electrons)Mass excess:64.99406 MeVMass defect:1.982006356 u (per nucleus)Nuclear binding energy:1846.22702858 MeV (per nucleus)
7.50498792 MeV (average binding energy per nucleon)Half-life:73(10) µsDecay constant λ:9495.1668569856 s^-1Specific activity α:2.324440337454 × 10⁺²⁵ Bq g^-1
6.282271182308 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 73(10) µs respectively 7.3 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SZ	^div	≤ 100 %

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
²⁴⁶Am		39(3) min	(7-)
^246m1Am		25.0(2) min	2(-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 246) with Americium-246m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 151	Isobar A = 246
92	²⁴²U
93	²⁴⁴Np
94	²⁴⁵Pu	²⁴⁶Pu
95	²⁴⁶Am	²⁴⁶Am
96	²⁴⁷Cm	²⁴⁶Cm
97	²⁴⁸Bk	²⁴⁶Bk
98	²⁴⁹Cf	²⁴⁶Cf
99	²⁵⁰Es	²⁴⁶Es
100	²⁵¹Fm	²⁴⁶Fm
101	²⁵²Md	²⁴⁶Md
102	²⁵³No
103	²⁵⁴Lr
104	²⁵⁵Rf
105	²⁵⁶Db