Neodymium-158

Properties and data of the isotope ¹⁵⁸Nd.

Content

General data

Name of the isotope:Neodymium-158; Nd-158Symbol:¹⁵⁸Nd or 15860NdMass number A:158 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:98Isotopic mass:157.94197(21) u (atomic weight of Neodymium-158)Nuclide mass:157.9090577 u (calculated nuclear mass without electrons)Mass excess:-54.0546 MeVMass defect:1.376693688 u (per nucleus)Nuclear binding energy:1282.38191021 MeV (per nucleus)
8.1163412 MeV (average binding energy per nucleon)Separation energy:S_N = 5.66(20) MeV (first neutron)
S_P = 12.80(36) MeV (first proton)Half-life:820 msDecay constant λ:0.84530143970725 s^-1Specific activity α:3.242372190461 × 10⁺²¹ Bq g^-1
87631680823.281 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1992

Radioactive Decay

Half-life T_½ = 820 ms respectively 8.2 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁸Pm	100 %	5.03(20) MeV
β^-, n	¹⁵⁷Pm	?	0.17(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁸Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 158) with Neodymium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 98	Isobar A = 158
57	¹⁵⁵La
58	¹⁵⁶Ce
59	¹⁵⁷Pr	¹⁵⁸Pr
60	¹⁵⁸Nd	¹⁵⁸Nd
61	¹⁵⁹Pm	¹⁵⁸Pm
62	¹⁶⁰Sm	¹⁵⁸Sm
63	¹⁶¹Eu	¹⁵⁸Eu
64	¹⁶²Gd	¹⁵⁸Gd
65	¹⁶³Tb	¹⁵⁸Tb
66	¹⁶⁴Dy	¹⁵⁸Dy
67	¹⁶⁵Ho	¹⁵⁸Ho
68	¹⁶⁶Er	¹⁵⁸Er
69	¹⁶⁷Tm	¹⁵⁸Tm
70	¹⁶⁸Yb	¹⁵⁸Yb
71	¹⁶⁹Lu	¹⁵⁸Lu
72	¹⁷⁰Hf	¹⁵⁸Hf
73	¹⁷¹Ta	¹⁵⁸Ta
74	¹⁷²W	¹⁵⁸W
75	¹⁷³Re
76	¹⁷⁴Os
77	¹⁷⁵Ir
78	¹⁷⁶Pt
79	¹⁷⁷Au
80	¹⁷⁸Hg
81	¹⁷⁹Tl
82	¹⁸⁰Pb