Neodymium-156

Properties and data of the isotope ¹⁵⁶Nd.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Neodymium isotopes (and general data sources).

General data

Name of the isotope:Neodymium-156; Nd-156Symbol:¹⁵⁶Nd or 15660NdMass number A:156 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:96Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6 (= neutron-proton ratio)Neutron excess (N-Z):36Isotopic mass:155.93508(21) u (atomic weight of Neodymium-156)Nuclide mass:155.9021677 u (calculated nuclear mass without electrons)Mass excess:-60.47259 MeVMass defect:1.366253856 u (per nucleus)Nuclear binding energy:1272.65726934 MeV (per nucleus)
8.15805942 MeV (average binding energy per nucleon)Separation energy:S_N = 6.26(20) MeV (first neutron)
S_P = 12.35(20) MeV (first proton)Half-life:5.26(20) sDecay constant λ:0.1317770305247 s^-1Specific activity α:5.119869934993 × 10⁺²⁰ Bq g^-1
13837486310.793 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1987

Radioactive Decay

Half-life T_½ = 5.26(20) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁶Pm	100 %	3.69(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁶Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 156) with Neodymium-156. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 96	Isobar A = 156
55	¹⁵¹Cs
56	¹⁵²Ba
57	¹⁵³La	¹⁵⁶La
58	¹⁵⁴Ce	¹⁵⁶Ce
59	¹⁵⁵Pr	¹⁵⁶Pr
60	¹⁵⁶Nd	¹⁵⁶Nd
61	¹⁵⁷Pm	¹⁵⁶Pm
62	¹⁵⁸Sm	¹⁵⁶Sm
63	¹⁵⁹Eu	¹⁵⁶Eu
64	¹⁶⁰Gd	¹⁵⁶Gd
65	¹⁶¹Tb	¹⁵⁶Tb
66	¹⁶²Dy	¹⁵⁶Dy
67	¹⁶³Ho	¹⁵⁶Ho
68	¹⁶⁴Er	¹⁵⁶Er
69	¹⁶⁵Tm	¹⁵⁶Tm
70	¹⁶⁶Yb	¹⁵⁶Yb
71	¹⁶⁷Lu	¹⁵⁶Lu
72	¹⁶⁸Hf	¹⁵⁶Hf
73	¹⁶⁹Ta	¹⁵⁶Ta
74	¹⁷⁰W	¹⁵⁶W
75	¹⁷¹Re
76	¹⁷²Os
77	¹⁷³Ir
78	¹⁷⁴Pt
79	¹⁷⁵Au
80	¹⁷⁶Hg
81	¹⁷⁷Tl
82	¹⁷⁸Pb