Praseodymium-142m

Properties and data of the isotope ¹⁴²Pr.

Content

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-142m; Pr-142mSymbol:¹⁴²Pr or 14259PrMass number A:142 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:83Isotopic mass:141.9100504(18) u (atomic weight of Praseodymium-142m)
Excitation energy: 3.694(3) keVNuclide mass:141.8776866 u (calculated nuclear mass without electrons)Mass excess:-83.78751 MeVMass defect:1.270814516 u (per nucleus)Nuclear binding energy:1183.75609677 MeV (per nucleus)
8.33631054 MeV (average binding energy per nucleon)Half-life:14.6(5) minDecay constant λ:0.0007912639047488 s^-1Specific activity α:3.379505455163 × 10⁺¹⁸ Bq g^-1
91337985.274695 Ci g^-1Spin and parity:
(nuclear angular momentum)5-Magnetic dipole moment:μ(μ_N) = 2.2(1)Nuclear g-factor:g_l = 0.44

Radioactive Decay

Half-life T_½ = 14.6(5) min (minutes) respectively 8.76 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴²Pr	100 %	0.004 MeV

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
¹⁴²Pr		19.12(4) h	2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 142) with Praseodymium-142m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 83	Isobar A = 142
46	¹²⁹Pd
47	¹³⁰Ag
48	¹³¹Cd
49	¹³²In
50	¹³³Sn
51	¹³⁴Sb
52	¹³⁵Te	¹⁴²Te
53	¹³⁶I	¹⁴²I
54	¹³⁷Xe	¹⁴²Xe
55	¹³⁸Cs	¹⁴²Cs
56	¹³⁹Ba	¹⁴²Ba
57	¹⁴⁰La	¹⁴²La
58	¹⁴¹Ce	¹⁴²Ce
59	¹⁴²Pr	¹⁴²Pr
60	¹⁴³Nd	¹⁴²Nd
61	¹⁴⁴Pm	¹⁴²Pm
62	¹⁴⁵Sm	¹⁴²Sm
63	¹⁴⁶Eu	¹⁴²Eu
64	¹⁴⁷Gd	¹⁴²Gd
65	¹⁴⁸Tb	¹⁴²Tb
66	¹⁴⁹Dy	¹⁴²Dy
67	¹⁵⁰Ho	¹⁴²Ho
68	¹⁵¹Er
69	¹⁵²Tm
70	¹⁵³Yb
71	¹⁵⁴Lu
72	¹⁵⁵Hf
73	¹⁵⁶Ta
74	¹⁵⁷W