Praseodymium-137

Properties and data of the isotope ¹³⁷Pr.

Content

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-137; Pr-137Symbol:¹³⁷Pr or 13759PrMass number A:137 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:78Isotopic mass:136.910679(9) u (atomic weight of Praseodymium-137)Nuclide mass:136.8783152 u (calculated nuclear mass without electrons)Mass excess:-83.20198 MeVMass defect:1.226861336 u (per nucleus)Nuclear binding energy:1142.81397332 MeV (per nucleus)
8.34170783 MeV (average binding energy per nucleon)Separation energy:S_N = 9.933(14) MeV (first neutron)
S_P = 3.982(8) MeV (first proton)Half-life:1.28(3) hDecay constant λ:0.00015042256522568 s^-1Specific activity α:6.660778502221 × 10⁺¹⁷ Bq g^-1
18002104.060057 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Year of discovery:1958

Radioactive Decay

Half-life T_½ = 1.28(3) h (hours) respectively 4.608 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³⁷Ce	100 %	2.717(8) MeV

Parent Nuclides

Direct parent isotope is: ¹³⁷Nd.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^137mPr	561.22(23) keV	2.66(7) μs	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 137) with Praseodymium-137. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 78	Isobar A = 137
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh
46	¹²⁴Pd
47	¹²⁵Ag
48	¹²⁶Cd
49	¹²⁷In	¹³⁷In
50	¹²⁸Sn	¹³⁷Sn
51	¹²⁹Sb	¹³⁷Sb
52	¹³⁰Te	¹³⁷Te
53	¹³¹I	¹³⁷I
54	¹³²Xe	¹³⁷Xe
55	¹³³Cs	¹³⁷Cs
56	¹³⁴Ba	¹³⁷Ba
57	¹³⁵La	¹³⁷La
58	¹³⁶Ce	¹³⁷Ce
59	¹³⁷Pr	¹³⁷Pr
60	¹³⁸Nd	¹³⁷Nd
61	¹³⁹Pm	¹³⁷Pm
62	¹⁴⁰Sm	¹³⁷Sm
63	¹⁴¹Eu	¹³⁷Eu
64	¹⁴²Gd	¹³⁷Gd
65	¹⁴³Tb	¹³⁷Tb
66	¹⁴⁴Dy
67	¹⁴⁵Ho
68	¹⁴⁶Er
69	¹⁴⁷Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu