Neodymium-149

Properties and data of the isotope ¹⁴⁹Nd.

Content

General data

Name of the isotope:Neodymium-149; Nd-149Symbol:¹⁴⁹Nd or 14960NdMass number A:149 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:89Isotopic mass:148.9201546(23) u (atomic weight of Neodymium-149)Nuclide mass:148.8872423 u (calculated nuclear mass without electrons)Mass excess:-74.37551 MeVMass defect:1.320524844 u (per nucleus)Nuclear binding energy:1230.06096904 MeV (per nucleus)
8.25544275 MeV (average binding energy per nucleon)Separation energy:S_N = 5.03879(7) MeV (first neutron)
S_P = 9.129(15) MeV (first proton)Half-life:1.728(1) hDecay constant λ:0.00011142412238939 s^-1Specific activity α:4.533863244755 × 10⁺¹⁷ Bq g^-1
12253684.445284 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = 0.35Quadrupole moment Q:1.3(3) barn (100 fm²)Nuclear g-factor:g_l = 0.14Year of discovery:1938

Radioactive Decay

Half-life T_½ = 1.728(1) h (hours) respectively 6.2208 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁹Pm	100 %	1.6888(25) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁹Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 149) with Neodymium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 89	Isobar A = 149
50	¹³⁹Sn
51	¹⁴⁰Sb
52	¹⁴¹Te
53	¹⁴²I
54	¹⁴³Xe
55	¹⁴⁴Cs	¹⁴⁹Cs
56	¹⁴⁵Ba	¹⁴⁹Ba
57	¹⁴⁶La	¹⁴⁹La
58	¹⁴⁷Ce	¹⁴⁹Ce
59	¹⁴⁸Pr	¹⁴⁹Pr
60	¹⁴⁹Nd	¹⁴⁹Nd
61	¹⁵⁰Pm	¹⁴⁹Pm
62	¹⁵¹Sm	¹⁴⁹Sm
63	¹⁵²Eu	¹⁴⁹Eu
64	¹⁵³Gd	¹⁴⁹Gd
65	¹⁵⁴Tb	¹⁴⁹Tb
66	¹⁵⁵Dy	¹⁴⁹Dy
67	¹⁵⁶Ho	¹⁴⁹Ho
68	¹⁵⁷Er	¹⁴⁹Er
69	¹⁵⁸Tm	¹⁴⁹Tm
70	¹⁵⁹Yb	¹⁴⁹Yb
71	¹⁶⁰Lu	¹⁴⁹Lu
72	¹⁶¹Hf
73	¹⁶²Ta
74	¹⁶³W
75	¹⁶⁴Re
76	¹⁶⁵Os
77	¹⁶⁶Ir
78	¹⁶⁷Pt