Neodymium-140

Properties and data of the isotope ¹⁴⁰Nd.

Content

General data

Name of the isotope:Neodymium-140; Nd-140Symbol:¹⁴⁰Nd or 14060NdMass number A:140 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:80Isotopic mass:139.909544(4) u (atomic weight of Neodymium-140)Nuclide mass:139.8766317 u (calculated nuclear mass without electrons)Mass excess:-84.25922 MeVMass defect:1.2531512 u (per nucleus)Nuclear binding energy:1167.30282389 MeV (per nucleus)
8.33787731 MeV (average binding energy per nucleon)Separation energy:S_N = 10.316(28) MeV (first neutron)
S_P = 6.729(9) MeV (first proton)Half-life:3.37(2) dDecay constant λ:2.380574721672 × 10^-6 s^-1Specific activity α:1.031378151188 × 10⁺¹⁶ Bq g^-1
278750.85167249 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.9101(26) femtometer fmYear of discovery:1949

Radioactive Decay

Half-life T_½ = 3.37(2) d respectively 2.91168 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE	¹⁴⁰Pr	100 %	0.429(7) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁰Pm.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^140mNd	2221.4(1) keV	0.60(5) ms	7-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 140) with Neodymium-140. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 140
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In
50	¹³⁰Sn
51	¹³¹Sb	¹⁴⁰Sb
52	¹³²Te	¹⁴⁰Te
53	¹³³I	¹⁴⁰I
54	¹³⁴Xe	¹⁴⁰Xe
55	¹³⁵Cs	¹⁴⁰Cs
56	¹³⁶Ba	¹⁴⁰Ba
57	¹³⁷La	¹⁴⁰La
58	¹³⁸Ce	¹⁴⁰Ce
59	¹³⁹Pr	¹⁴⁰Pr
60	¹⁴⁰Nd	¹⁴⁰Nd
61	¹⁴¹Pm	¹⁴⁰Pm
62	¹⁴²Sm	¹⁴⁰Sm
63	¹⁴³Eu	¹⁴⁰Eu
64	¹⁴⁴Gd	¹⁴⁰Gd
65	¹⁴⁵Tb	¹⁴⁰Tb
66	¹⁴⁶Dy	¹⁴⁰Dy
67	¹⁴⁷Ho	¹⁴⁰Ho
68	¹⁴⁸Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu