Neodymium-140m

Properties and data of the isotope ^140mNd.

Contents

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

General data

Name of the isotope:Neodymium-140m; Nd-140mSymbol:^140mNd or 140m60NdMass number A:140 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:80Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3333333333333 (= neutron-proton ratio)Neutron excess (N-Z):20Excitation energy:2221.4(1) keVIsotopic mass:139.909544(4) u (atomic weight of Neodymium-140m)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)Half-life:0.60(5) msDecay constant λ:1155.2453009332 s^-1Specific activity α:5.005071892086 × 10⁺²⁴ Bq g^-1
1.352722132996 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)7-

Radioactive Decay

Half-life T_½ = 0.60(5) ms respectively 6.0 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴⁰Nd	100 %

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
¹⁴⁰Nd		3.37(2) d	0+

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-140m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 80	Isobar A = 140
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In
50	¹³⁰Sn	¹⁴⁰Sn
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