Plutonium-245

Properties and data of the isotope ²⁴⁵Pu.

Content

General data

Name of the isotope:Plutonium-245; Pu-245Symbol:²⁴⁵Pu or 24594PuMass number A:245 (= number of nucleons)Atomic number Z:94 (= number of protons)Neutrons N:151Isotopic mass:245.067825(15) u (atomic weight of Plutonium-245)Nuclide mass:245.0162655 u (calculated nuclear mass without electrons)Mass excess:63.17858 MeVMass defect:1.976130324 u (per nucleus)Nuclear binding energy:1840.75354002 MeV (per nucleus)
7.51327976 MeV (average binding energy per nucleon)Separation energy:S_N = 4.699(13) MeV (first neutron)
S_P = 7.31(30) MeV (first proton)Half-life:10.5(1) hDecay constant λ:1.83372269989 × 10^-5 s^-1Specific activity α:4.507320978296 × 10⁺¹⁶ Bq g^-1
1218194.8589989 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2-)Year of discovery:1955

Radioactive Decay

Half-life T_½ = 10.5(1) h (hours) respectively 3.7800 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁴⁵Am	100 %	1.278(14) 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
^245mPu	264.5(3) keV	0.33(2) μs	(5/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 245) with Plutonium-245. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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