Americium-245

Properties and data of the isotope ²⁴⁵Am.

Content

General data

Name of the isotope:Americium-245; Am-245Symbol:²⁴⁵Am or 24595AmMass number A:245 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:150Isotopic mass:245.0664529(20) u (atomic weight of Americium-245)Nuclide mass:245.014345 u (calculated nuclear mass without electrons)Mass excess:61.90048 MeVMass defect:1.97666254 u (per nucleus)Nuclear binding energy:1841.24929603 MeV (per nucleus)
7.51530325 MeV (average binding energy per nucleon)Separation energy:S_N = 6.0500(19) MeV (first neutron)
S_P = 5.1945(29) MeV (first proton)Half-life:2.05(1) hDecay constant λ:9.392238218969 × 10^-5 s^-1Specific activity α:2.308627818151 × 10⁺¹⁷ Bq g^-1
6239534.6436532 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)+Year of discovery:1955

Radioactive Decay

Half-life T_½ = 2.05(1) h (hours) respectively 7.380 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁴⁵Cm	100 %	0.8959(15) MeV

Parent Nuclides

Direct parent isotopes are: ²⁴⁹Bk, ²⁴⁵Pu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 150) and isobaric (same nucleon number A = 245) with Americium-245. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 150	Isobar A = 245
92	²⁴²U
93	²⁴³Np
94	²⁴⁴Pu	²⁴⁵Pu
95	²⁴⁵Am	²⁴⁵Am
96	²⁴⁶Cm	²⁴⁵Cm
97	²⁴⁷Bk	²⁴⁵Bk
98	²⁴⁸Cf	²⁴⁵Cf
99	²⁴⁹Es	²⁴⁵Es
100	²⁵⁰Fm	²⁴⁵Fm
101	²⁵¹Md	²⁴⁵Md
102	²⁵²No
103	²⁵³Lr
104	²⁵⁴Rf
105	²⁵⁵Db