Neodymium-125

Properties and data of the isotope ¹²⁵Nd.

Content

General data

Name of the isotope:Neodymium-125; Nd-125Symbol:¹²⁵Nd or 12560NdMass number A:125 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:65Isotopic mass:124.94890(43) u (atomic weight of Neodymium-125)Nuclide mass:124.9159877 u (calculated nuclear mass without electrons)Mass excess:-47.59934 MeVMass defect:1.08382146 u (per nucleus)Nuclear binding energy:1009.57318706 MeV (per nucleus)
8.0765855 MeV (average binding energy per nucleon)Separation energy:S_N = 11.14(64) MeV (first neutron)
S_P = 1.74(57) MeV (first proton)Half-life:0.65(15) sDecay constant λ:1.0663802777845 s^-1Specific activity α:5.178945357320 × 10⁺²¹ Bq g^-1
139971496143.79 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)Year of discovery:1999

Radioactive Decay

Half-life T_½ = 0.65(15) s respectively 6.5 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹²⁵Pr	> 99 %	10.34(50) MeV
EE, p	¹²⁴Ce	≤≤ 1 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 125) with Neodymium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 65	Isobar A = 125
36	¹⁰¹Kr
37	¹⁰²Rb
38	¹⁰³Sr
39	¹⁰⁴Y
40	¹⁰⁵Zr
41	¹⁰⁶Nb
42	¹⁰⁷Mo
43	¹⁰⁸Tc
44	¹⁰⁹Ru
45	¹¹⁰Rh	¹²⁵Rh
46	¹¹¹Pd	¹²⁵Pd
47	¹¹²Ag	¹²⁵Ag
48	¹¹³Cd	¹²⁵Cd
49	¹¹⁴In	¹²⁵In
50	¹¹⁵Sn	¹²⁵Sn
51	¹¹⁶Sb	¹²⁵Sb
52	¹¹⁷Te	¹²⁵Te
53	¹¹⁸I	¹²⁵I
54	¹¹⁹Xe	¹²⁵Xe
55	¹²⁰Cs	¹²⁵Cs
56	¹²¹Ba	¹²⁵Ba
57	¹²²La	¹²⁵La
58	¹²³Ce	¹²⁵Ce
59	¹²⁴Pr	¹²⁵Pr
60	¹²⁵Nd	¹²⁵Nd
61	¹²⁶Pm