Neodymium-126

Properties and data of the isotope ¹²⁶Nd.

Content

General data

Name of the isotope:Neodymium-126; Nd-126Symbol:¹²⁶Nd or 12660NdMass number A:126 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:66Isotopic mass:125.94311(32) u (atomic weight of Neodymium-126)Nuclide mass:125.9101977 u (calculated nuclear mass without electrons)Mass excess:-52.99269 MeVMass defect:1.098276376 u (per nucleus)Nuclear binding energy:1023.03785459 MeV (per nucleus)
8.11934805 MeV (average binding energy per nucleon)Separation energy:S_N = 13.46(50) MeV (first neutron)
S_P = 2.34(42) MeV (first proton)Half-life:< 1 sDecay constant λ:0.69314718055995 s^-1Specific activity α:3.339383966 × 10⁺²¹ Bq g^-1
90253620713.514 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2000

Radioactive Decay

Half-life T_½ = < 1 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹²⁶Pr	?	7.33(36) MeV
EE, p	¹²⁵Ce	?

Parent Nuclides

Direct parent isotope is: ¹²⁶Pm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 66) and isobaric (same nucleon number A = 126) with Neodymium-126. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 66	Isobar A = 126
37	¹⁰³Rb
38	¹⁰⁴Sr
39	¹⁰⁵Y
40	¹⁰⁶Zr
41	¹⁰⁷Nb
42	¹⁰⁸Mo
43	¹⁰⁹Tc
44	¹¹⁰Ru
45	¹¹¹Rh	¹²⁶Rh
46	¹¹²Pd	¹²⁶Pd
47	¹¹³Ag	¹²⁶Ag
48	¹¹⁴Cd	¹²⁶Cd
49	¹¹⁵In	¹²⁶In
50	¹¹⁶Sn	¹²⁶Sn
51	¹¹⁷Sb	¹²⁶Sb
52	¹¹⁸Te	¹²⁶Te
53	¹¹⁹I	¹²⁶I
54	¹²⁰Xe	¹²⁶Xe
55	¹²¹Cs	¹²⁶Cs
56	¹²²Ba	¹²⁶Ba
57	¹²³La	¹²⁶La
58	¹²⁴Ce	¹²⁶Ce
59	¹²⁵Pr	¹²⁶Pr
60	¹²⁶Nd	¹²⁶Nd
61	¹²⁷Pm	¹²⁶Pm
62	¹²⁸Sm