Praseodymium-125

Properties and data of the isotope ¹²⁵Pr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Praseodymium-125; Pr-125Symbol:¹²⁵Pr or 12559PrMass number A:125 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:66Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.1186440677966 (= neutron-proton ratio)Neutron excess (N-Z):7Isotopic mass:124.93780(32) u (atomic weight of Praseodymium-125)Nuclide mass:124.9054362 u (calculated nuclear mass without electrons)Mass excess:-57.93893 MeVMass defect:1.095761344 u (per nucleus)Nuclear binding energy:1020.69511737 MeV (per nucleus)
8.16556094 MeV (average binding energy per nucleon)Separation energy:S_N = 12.86(59) MeV (first neutron)
S_P = 0.31(42) MeV (first proton)Half-life:3.3(7) sDecay constant λ:0.21004460016968 s^-1Specific activity α:1.02009529765 × 10⁺²¹ Bq g^-1
27570143179.838 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2002

Radioactive Decay

Half-life T_½ = 3.3(7) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹²⁵Ce	< 100 %	8.72(36) MeV
β⁺, p	¹²⁴La	?

Parent Nuclides

Direct parent isotope is: ¹²⁵Nd.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 66) and isobaric (same nucleon number A = 125) with Praseodymium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 66	Isobar A = 125
37	¹⁰³Rb
38	¹⁰⁴Sr
39	¹⁰⁵Y
40	¹⁰⁶Zr
41	¹⁰⁷Nb
42	¹⁰⁸Mo
43	¹⁰⁹Tc
44	¹¹⁰Ru
45	¹¹¹Rh	¹²⁵Rh
46	¹¹²Pd	¹²⁵Pd
47	¹¹³Ag	¹²⁵Ag
48	¹¹⁴Cd	¹²⁵Cd
49	¹¹⁵In	¹²⁵In
50	¹¹⁶Sn	¹²⁵Sn
51	¹¹⁷Sb	¹²⁵Sb
52	¹¹⁸Te	¹²⁵Te
53	¹¹⁹I	¹²⁵I
54	¹²⁰Xe	¹²⁵Xe
55	¹²¹Cs	¹²⁵Cs
56	¹²²Ba	¹²⁵Ba
57	¹²³La	¹²⁵La
58	¹²⁴Ce	¹²⁵Ce
59	¹²⁵Pr	¹²⁵Pr
60	¹²⁶Nd	¹²⁵Nd
61	¹²⁷Pm
62	¹²⁸Sm