Praseodymium-136

Properties and data of the isotope ¹³⁶Pr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-136; Pr-136Symbol:¹³⁶Pr or 13659PrMass number A:136 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:77Isotopic mass:135.912678(12) u (atomic weight of Praseodymium-136)Nuclide mass:135.8803142 u (calculated nuclear mass without electrons)Mass excess:-81.33992 MeVMass defect:1.21619742 u (per nucleus)Nuclear binding energy:1132.88059955 MeV (per nucleus)
8.33000441 MeV (average binding energy per nucleon)Separation energy:S_N = 8.476(16) MeV (first neutron)
S_P = 4.013(15) MeV (first proton)Half-life:13.1(1) minDecay constant λ:0.00088186664193377 s^-1Specific activity α:3.933870472151 × 10⁺¹⁸ Bq g^-1
106320823.57166 Ci g^-1Spin and parity:
(nuclear angular momentum)2+Year of discovery:1968

Radioactive Decay

Half-life T_½ = 13.1(1) min (minutes) respectively 7.86 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹³⁶Ce	100 %	5.168(11) MeV

Parent Nuclides

Direct parent isotope is: ¹³⁶Nd.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 136) with Praseodymium-136. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 77	Isobar A = 136
43	¹²⁰Tc
44	¹²¹Ru
45	¹²²Rh
46	¹²³Pd
47	¹²⁴Ag
48	¹²⁵Cd
49	¹²⁶In	¹³⁶In
50	¹²⁷Sn	¹³⁶Sn
51	¹²⁸Sb	¹³⁶Sb
52	¹²⁹Te	¹³⁶Te
53	¹³⁰I	¹³⁶I
54	¹³¹Xe	¹³⁶Xe
55	¹³²Cs	¹³⁶Cs
56	¹³³Ba	¹³⁶Ba
57	¹³⁴La	¹³⁶La
58	¹³⁵Ce	¹³⁶Ce
59	¹³⁶Pr	¹³⁶Pr
60	¹³⁷Nd	¹³⁶Nd
61	¹³⁸Pm	¹³⁶Pm
62	¹³⁹Sm	¹³⁶Sm
63	¹⁴⁰Eu	¹³⁶Eu
64	¹⁴¹Gd	¹³⁶Gd
65	¹⁴²Tb	¹³⁶Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm