Neodymium-155

Properties and data of the isotope ¹⁵⁵Nd.

Contents

General data

Name of the isotope:Neodymium-155; Nd-155Symbol:¹⁵⁵Nd or 15560NdMass number A:155 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:95Isotopic mass:154.933136(10) u (atomic weight of Neodymium-155)Nuclide mass:154.9002237 u (calculated nuclear mass without electrons)Mass excess:-62.28341 MeVMass defect:1.35953294 u (per nucleus)Nuclear binding energy:1266.39677641 MeV (per nucleus)
8.17030178 MeV (average binding energy per nucleon)Separation energy:S_N = 4.53(5) MeV (first neutron)
S_P = 11.47(11) MeV (first proton)Half-life:8.9(2) sDecay constant λ:0.077881705680893 s^-1Specific activity α:3.045549363782 × 10⁺²⁰ Bq g^-1
8231214496.7089 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-~Year of discovery:1986

Radioactive Decay

Half-life T_½ = 8.9(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁵Pm	100 %	4.656(10) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁵Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 155) with Neodymium-155. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 95	Isobar A = 155
55	¹⁵⁰Cs
56	¹⁵¹Ba
57	¹⁵²La	¹⁵⁵La
58	¹⁵³Ce	¹⁵⁵Ce
59	¹⁵⁴Pr	¹⁵⁵Pr
60	¹⁵⁵Nd	¹⁵⁵Nd
61	¹⁵⁶Pm	¹⁵⁵Pm
62	¹⁵⁷Sm	¹⁵⁵Sm
63	¹⁵⁸Eu	¹⁵⁵Eu
64	¹⁵⁹Gd	¹⁵⁵Gd
65	¹⁶⁰Tb	¹⁵⁵Tb
66	¹⁶¹Dy	¹⁵⁵Dy
67	¹⁶²Ho	¹⁵⁵Ho
68	¹⁶³Er	¹⁵⁵Er
69	¹⁶⁴Tm	¹⁵⁵Tm
70	¹⁶⁵Yb	¹⁵⁵Yb
71	¹⁶⁶Lu	¹⁵⁵Lu
72	¹⁶⁷Hf	¹⁵⁵Hf
73	¹⁶⁸Ta	¹⁵⁵Ta
74	¹⁶⁹W
75	¹⁷⁰Re
76	¹⁷¹Os
77	¹⁷²Ir
78	¹⁷³Pt
79	¹⁷⁴Au
80	¹⁷⁵Hg
81	¹⁷⁶Tl