Praseodymium-146

Properties and data of the isotope ¹⁴⁶Pr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-146; Pr-146Symbol:¹⁴⁶Pr or 14659PrMass number A:146 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:87Isotopic mass:145.91768(4) u (atomic weight of Praseodymium-146)Nuclide mass:145.8853162 u (calculated nuclear mass without electrons)Mass excess:-76.68059 MeVMass defect:1.29784458 u (per nucleus)Nuclear binding energy:1208.9344392 MeV (per nucleus)
8.28037287 MeV (average binding energy per nucleon)Separation energy:S_N = 5.13(4) MeV (first neutron)
S_P = 6.90(5) MeV (first proton)Half-life:24.09(10) minDecay constant λ:0.00047955388166594 s^-1Specific activity α:1.991683465739 × 10⁺¹⁸ Bq g^-1
53829282.857814 Ci g^-1Spin and parity:
(nuclear angular momentum)(2)-Year of discovery:1953

Radioactive Decay

Half-life T_½ = 24.09(10) min (minutes) respectively 1.4454 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁶Nd	100 %	4.24(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁶Ce.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 146) with Praseodymium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 87	Isobar A = 146
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb
52	¹³⁹Te
53	¹⁴⁰I
54	¹⁴¹Xe	¹⁴⁶Xe
55	¹⁴²Cs	¹⁴⁶Cs
56	¹⁴³Ba	¹⁴⁶Ba
57	¹⁴⁴La	¹⁴⁶La
58	¹⁴⁵Ce	¹⁴⁶Ce
59	¹⁴⁶Pr	¹⁴⁶Pr
60	¹⁴⁷Nd	¹⁴⁶Nd
61	¹⁴⁸Pm	¹⁴⁶Pm
62	¹⁴⁹Sm	¹⁴⁶Sm
63	¹⁵⁰Eu	¹⁴⁶Eu
64	¹⁵¹Gd	¹⁴⁶Gd
65	¹⁵²Tb	¹⁴⁶Tb
66	¹⁵³Dy	¹⁴⁶Dy
67	¹⁵⁴Ho	¹⁴⁶Ho
68	¹⁵⁵Er	¹⁴⁶Er
69	¹⁵⁶Tm	¹⁴⁶Tm
70	¹⁵⁷Yb
71	¹⁵⁸Lu
72	¹⁵⁹Hf
73	¹⁶⁰Ta
74	¹⁶¹W
75	¹⁶²Re
76	¹⁶³Os
77	¹⁶⁴Ir