Neodymium-157

Properties and data of the isotope ¹⁵⁷Nd.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Neodymium-157; Nd-157Symbol:¹⁵⁷Nd or 15760NdMass number A:157 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.6166666666667 (= neutron-proton ratio)Neutron excess (N-Z):37Isotopic mass:156.939386(27) u (atomic weight of Neodymium-157)Nuclide mass:156.9064737 u (calculated nuclear mass without electrons)Mass excess:-56.46158 MeVMass defect:1.370612772 u (per nucleus)Nuclear binding energy:1276.71757344 MeV (per nucleus)
8.13195907 MeV (average binding energy per nucleon)Separation energy:S_N = 4.06(20) MeV (first neutron)
S_P = 12.18(20) MeV (first proton)Half-life:1.15(3) sDecay constant λ:0.60273667874778 s^-1Specific activity α:2.326772551839 × 10⁺²¹ Bq g^-1
62885744644.311 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1992

Radioactive Decay

Half-life T_½ = 1.15(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁷Pm	100 %	5.835(26) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁷Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 157) with Neodymium-157. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 97	Isobar A = 157
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce	¹⁵⁷Ce
59	¹⁵⁶Pr	¹⁵⁷Pr
60	¹⁵⁷Nd	¹⁵⁷Nd
61	¹⁵⁸Pm	¹⁵⁷Pm
62	¹⁵⁹Sm	¹⁵⁷Sm
63	¹⁶⁰Eu	¹⁵⁷Eu
64	¹⁶¹Gd	¹⁵⁷Gd
65	¹⁶²Tb	¹⁵⁷Tb
66	¹⁶³Dy	¹⁵⁷Dy
67	¹⁶⁴Ho	¹⁵⁷Ho
68	¹⁶⁵Er	¹⁵⁷Er
69	¹⁶⁶Tm	¹⁵⁷Tm
70	¹⁶⁷Yb	¹⁵⁷Yb
71	¹⁶⁸Lu	¹⁵⁷Lu
72	¹⁶⁹Hf	¹⁵⁷Hf
73	¹⁷⁰Ta	¹⁵⁷Ta
74	¹⁷¹W	¹⁵⁷W
75	¹⁷²Re
76	¹⁷³Os
77	¹⁷⁴Ir
78	¹⁷⁵Pt
79	¹⁷⁶Au
80	¹⁷⁷Hg
81	¹⁷⁸Tl
82	¹⁷⁹Pb