Americium-247

Properties and data of the isotope ²⁴⁷Am.

Content

General data

Name of the isotope:Americium-247; Am-247Symbol:²⁴⁷Am or 24795AmMass number A:247 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:152Isotopic mass:247.07209(11) u (atomic weight of Americium-247)Nuclide mass:247.0199821 u (calculated nuclear mass without electrons)Mass excess:67.1514 MeVMass defect:1.988355272 u (per nucleus)Nuclear binding energy:1852.14100574 MeV (per nucleus)
7.49854658 MeV (average binding energy per nucleon)Separation energy:S_N = 5.91(10) MeV (first neutron)
S_P = 5.53(10) MeV (first proton)Half-life:23.0(13) minDecay constant λ:0.00050228056562315 s^-1Specific activity α:1.224617132547 × 10⁺¹⁸ Bq g^-1
33097760.339111 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)Year of discovery:1967

Radioactive Decay

Half-life T_½ = 23.0(13) min (minutes) respectively 1.380 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁴⁷Cm	100 %	1.62(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 152) and isobaric (same nucleon number A = 247) with Americium-247. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 152	Isobar A = 247
94	²⁴⁶Pu	²⁴⁷Pu
95	²⁴⁷Am	²⁴⁷Am
96	²⁴⁸Cm	²⁴⁷Cm
97	²⁴⁹Bk	²⁴⁷Bk
98	²⁵⁰Cf	²⁴⁷Cf
99	²⁵¹Es	²⁴⁷Es
100	²⁵²Fm	²⁴⁷Fm
101	²⁵³Md	²⁴⁷Md
102	²⁵⁴No
103	²⁵⁵Lr
104	²⁵⁶Rf
105	²⁵⁷Db
106	²⁵⁸Sg