Praseodymium-155

Properties and data of the isotope ¹⁵⁵Pr.

Content

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-155; Pr-155Symbol:¹⁵⁵Pr or 15559PrMass number A:155 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:96Isotopic mass:154.940509(18) u (atomic weight of Praseodymium-155)Nuclide mass:154.9081452 u (calculated nuclear mass without electrons)Mass excess:-55.41551 MeVMass defect:1.352999824 u (per nucleus)Nuclear binding energy:1260.31121806 MeV (per nucleus)
8.13104012 MeV (average binding energy per nucleon)Separation energy:S_N = 5.38(11) MeV (first neutron)
S_P = 10.48(20) MeV (first proton)Half-life:1.47(3) sDecay constant λ:0.44149501946493 s^-1Specific activity α:1.726457919596 × 10⁺²¹ Bq g^-1
46661024853.954 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Year of discovery:1992

Radioactive Decay

Half-life T_½ = 1.47(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁵Nd	100 %	6.868(19) MeV
β^-, n	¹⁵⁴Nd	?	2.34(6) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁵Ce.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 155) with Praseodymium-155. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 96	Isobar A = 155
55	¹⁵¹Cs
56	¹⁵²Ba
57	¹⁵³La	¹⁵⁵La
58	¹⁵⁴Ce	¹⁵⁵Ce
59	¹⁵⁵Pr	¹⁵⁵Pr
60	¹⁵⁶Nd	¹⁵⁵Nd
61	¹⁵⁷Pm	¹⁵⁵Pm
62	¹⁵⁸Sm	¹⁵⁵Sm
63	¹⁵⁹Eu	¹⁵⁵Eu
64	¹⁶⁰Gd	¹⁵⁵Gd
65	¹⁶¹Tb	¹⁵⁵Tb
66	¹⁶²Dy	¹⁵⁵Dy
67	¹⁶³Ho	¹⁵⁵Ho
68	¹⁶⁴Er	¹⁵⁵Er
69	¹⁶⁵Tm	¹⁵⁵Tm
70	¹⁶⁶Yb	¹⁵⁵Yb
71	¹⁶⁷Lu	¹⁵⁵Lu
72	¹⁶⁸Hf	¹⁵⁵Hf
73	¹⁶⁹Ta	¹⁵⁵Ta
74	¹⁷⁰W
75	¹⁷¹Re
76	¹⁷²Os
77	¹⁷³Ir
78	¹⁷⁴Pt
79	¹⁷⁵Au
80	¹⁷⁶Hg
81	¹⁷⁷Tl
82	¹⁷⁸Pb