Neodymium-128

Properties and data of the isotope ¹²⁸Nd.

Content

General data

Name of the isotope:Neodymium-128; Nd-128Symbol:¹²⁸Nd or 12860NdMass number A:128 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:68Isotopic mass:127.93525(21) u (atomic weight of Neodymium-128)Nuclide mass:127.9023377 u (calculated nuclear mass without electrons)Mass excess:-60.31424 MeVMass defect:1.123466208 u (per nucleus)Nuclear binding energy:1046.50203195 MeV (per nucleus)
8.17579712 MeV (average binding energy per nucleon)Separation energy:S_N = 12.85(36) MeV (first neutron)
S_P = 3.06(28) MeV (first proton)Half-life:5 sDecay constant λ:0.13862943611199 s^-1Specific activity α:6.573590485039 × 10⁺²⁰ Bq g^-1
17766460770.377 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1985

Radioactive Decay

Half-life T_½ = 5 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹²⁸Pr	100 %	6.02(20) MeV
EE, p	¹²⁷Ce	?

Parent Nuclides

Direct parent isotope is: ¹²⁸Pm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 68) and isobaric (same nucleon number A = 128) with Neodymium-128. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 68	Isobar A = 128
38	¹⁰⁶Sr
39	¹⁰⁷Y
40	¹⁰⁸Zr
41	¹⁰⁹Nb
42	¹¹⁰Mo
43	¹¹¹Tc
44	¹¹²Ru
45	¹¹³Rh
46	¹¹⁴Pd	¹²⁸Pd
47	¹¹⁵Ag	¹²⁸Ag
48	¹¹⁶Cd	¹²⁸Cd
49	¹¹⁷In	¹²⁸In
50	¹¹⁸Sn	¹²⁸Sn
51	¹¹⁹Sb	¹²⁸Sb
52	¹²⁰Te	¹²⁸Te
53	¹²¹I	¹²⁸I
54	¹²²Xe	¹²⁸Xe
55	¹²³Cs	¹²⁸Cs
56	¹²⁴Ba	¹²⁸Ba
57	¹²⁵La	¹²⁸La
58	¹²⁶Ce	¹²⁸Ce
59	¹²⁷Pr	¹²⁸Pr
60	¹²⁸Nd	¹²⁸Nd
61	¹²⁹Pm	¹²⁸Pm
62	¹³⁰Sm	¹²⁸Sm
63	¹³¹Eu