Praseodymium-149

Properties and data of the isotope ¹⁴⁹Pr.

Content

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-149; Pr-149Symbol:¹⁴⁹Pr or 14959PrMass number A:149 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:90Isotopic mass:148.923736(11) u (atomic weight of Praseodymium-149)Nuclide mass:148.8913722 u (calculated nuclear mass without electrons)Mass excess:-71.03946 MeVMass defect:1.317783328 u (per nucleus)Nuclear binding energy:1227.50726333 MeV (per nucleus)
8.23830378 MeV (average binding energy per nucleon)Separation energy:S_N = 6.575(18) MeV (first neutron)
S_P = 7.930(15) MeV (first proton)Half-life:2.26(7) minDecay constant λ:0.005111704871386 s^-1Specific activity α:2.079959916885 × 10⁺¹⁹ Bq g^-1
562151328.88808 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1964

Radioactive Decay

Half-life T_½ = 2.26(7) min (minutes) respectively 1.356 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁹Nd	100 %	3.336(10) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁹Ce.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 149) with Praseodymium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 90	Isobar A = 149
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe
55	¹⁴⁵Cs	¹⁴⁹Cs
56	¹⁴⁶Ba	¹⁴⁹Ba
57	¹⁴⁷La	¹⁴⁹La
58	¹⁴⁸Ce	¹⁴⁹Ce
59	¹⁴⁹Pr	¹⁴⁹Pr
60	¹⁵⁰Nd	¹⁴⁹Nd
61	¹⁵¹Pm	¹⁴⁹Pm
62	¹⁵²Sm	¹⁴⁹Sm
63	¹⁵³Eu	¹⁴⁹Eu
64	¹⁵⁴Gd	¹⁴⁹Gd
65	¹⁵⁵Tb	¹⁴⁹Tb
66	¹⁵⁶Dy	¹⁴⁹Dy
67	¹⁵⁷Ho	¹⁴⁹Ho
68	¹⁵⁸Er	¹⁴⁹Er
69	¹⁵⁹Tm	¹⁴⁹Tm
70	¹⁶⁰Yb	¹⁴⁹Yb
71	¹⁶¹Lu	¹⁴⁹Lu
72	¹⁶²Hf
73	¹⁶³Ta
74	¹⁶⁴W
75	¹⁶⁵Re
76	¹⁶⁶Os
77	¹⁶⁷Ir
78	¹⁶⁸Pt