Neodymium-144

Properties and data of the isotope ¹⁴⁴Nd.

Content

General data

Name of the isotope:Neodymium-144; Nd-144Symbol:¹⁴⁴Nd or 14460NdMass number A:144 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:84Isotopic mass:143.9100928(13) u (atomic weight of Neodymium-144)Nuclide mass:143.8771805 u (calculated nuclear mass without electrons)Mass excess:-83.74802 MeVMass defect:1.287262064 u (per nucleus)Nuclear binding energy:1199.07688904 MeV (per nucleus)
8.32692284 MeV (average binding energy per nucleon)Separation energy:S_N = 7.81704(5) MeV (first neutron)
S_P = 7.9688(14) MeV (first proton)Half-life:2.29(16) × 10¹⁵ aDecay constant λ:9.598058039165 × 10^-24 s^-1Specific activity α:0.040420180065526 Bq g^-1
1.092437299068 × 10^-12 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.9421(27) femtometer fmYear of discovery:1924

Radioactive Decay

Half-life T_½ = 2.29(16) × 10¹⁵ a respectively 7.2217440 × 10²² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁴⁰Ce	100 %	1.9013(15) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁴⁴Pm, ¹⁴⁴Pr, ¹⁴⁸Sm.

Occurrence

Comparison of the natural Neodymium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Neodymium Isotopic mixture	144.242 u	100 %
Isotope ¹⁴²Nd	141.90773(2) u	27.153(40) %	stable	0+
Isotope ¹⁴³Nd	142.90982(2) u	12.173(26) %	stable	7/2-
Isotope ¹⁴⁴Nd	143.9100928(13) u	23.798(19) %	2.29(16) × 10¹⁵ a	0+
Isotope ¹⁴⁵Nd	144.91258(2) u	8.293(12) %	stable	7/2-
Isotope ¹⁴⁶Nd	145.91312(2) u	17.189(32) %	stable	0+
Isotope ¹⁴⁸Nd	147.91690(2) u	5.756(21) %	stable	0+
Isotope ¹⁵⁰Nd	149.92090(2) u	5.638(28) %	6.7(7) × 10¹⁸ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 144) with Neodymium-144. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 84	Isobar A = 144
47	¹³¹Ag
48	¹³²Cd
49	¹³³In
50	¹³⁴Sn
51	¹³⁵Sb
52	¹³⁶Te
53	¹³⁷I	¹⁴⁴I
54	¹³⁸Xe	¹⁴⁴Xe
55	¹³⁹Cs	¹⁴⁴Cs
56	¹⁴⁰Ba	¹⁴⁴Ba
57	¹⁴¹La	¹⁴⁴La
58	¹⁴²Ce	¹⁴⁴Ce
59	¹⁴³Pr	¹⁴⁴Pr
60	¹⁴⁴Nd	¹⁴⁴Nd
61	¹⁴⁵Pm	¹⁴⁴Pm
62	¹⁴⁶Sm	¹⁴⁴Sm
63	¹⁴⁷Eu	¹⁴⁴Eu
64	¹⁴⁸Gd	¹⁴⁴Gd
65	¹⁴⁹Tb	¹⁴⁴Tb
66	¹⁵⁰Dy	¹⁴⁴Dy
67	¹⁵¹Ho	¹⁴⁴Ho
68	¹⁵²Er	¹⁴⁴Er
69	¹⁵³Tm	¹⁴⁴Tm
70	¹⁵⁴Yb
71	¹⁵⁵Lu
72	¹⁵⁶Hf
73	¹⁵⁷Ta
74	¹⁵⁸W
75	¹⁵⁹Re