Americium-236

Properties and data of the isotope ²³⁶Am.

Content

General data

Name of the isotope:Americium-236; Am-236Symbol:²³⁶Am or 23695AmMass number A:236 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:141Isotopic mass:236.04943(12) u (atomic weight of Americium-236)Nuclide mass:235.9973221 u (calculated nuclear mass without electrons)Mass excess:46.04375 MeVMass defect:1.915701196 u (per nucleus)Nuclear binding energy:1784.46416987 MeV (per nucleus)
7.56128886 MeV (average binding energy per nucleon)Separation energy:S_N = 6.66(12) MeV (first neutron)
S_P = 3.43(11) MeV (first proton)Half-life:3.6(2) minDecay constant λ:0.0032090147248146 s^-1Specific activity α:8.188618090866 × 10⁺¹⁸ Bq g^-1
221314002.45585 Ci g^-1Spin and parity:
(nuclear angular momentum)5-Year of discovery:1998

Radioactive Decay

Half-life T_½ = 3.6(2) min (minutes) respectively 2.16 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²³²Np	? %	6.26(5) MeV
EE	²³⁶Pu	? %	3.41(11) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 141) and isobaric (same nucleon number A = 236) with Americium-236. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 141	Isobar A = 236
83	²²⁴Bi
84	²²⁵Po
85	²²⁶At
86	²²⁷Rn
87	²²⁸Fr
88	²²⁹Ra
89	²³⁰Ac	²³⁶Ac
90	²³¹Th	²³⁶Th
91	²³²Pa	²³⁶Pa
92	²³³U	²³⁶U
93	²³⁴Np	²³⁶Np
94	²³⁵Pu	²³⁶Pu
95	²³⁶Am	²³⁶Am
96	²³⁷Cm	²³⁶Cm
97	²³⁸Bk	²³⁶Bk
98	²³⁹Cf
99	²⁴⁰Es
100	²⁴¹Fm