Promethium-144

Properties and data of the isotope ¹⁴⁴Pm.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Promethium-144; Pm-144Symbol:¹⁴⁴Pm or 14461PmMass number A:144 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:83Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3606557377049 (= neutron-proton ratio)Neutron excess (N-Z):22Isotopic mass:143.912596(3) u (atomic weight of Promethium-144)Nuclide mass:143.8791352 u (calculated nuclear mass without electrons)Mass excess:-81.4163 MeVMass defect:1.28391898 u (per nucleus)Nuclear binding energy:1195.96282636 MeV (per nucleus)
8.30529741 MeV (average binding energy per nucleon)Separation energy:S_N = 6.5268(15) MeV (first neutron)
S_P = 4.7028(26) MeV (first proton)Half-life:363(14) dDecay constant λ:2.210290754336 × 10^-8 s^-1Specific activity α:93081694154060 Bq g^-1
2515.7214636232 Ci g^-1Spin and parity:
(nuclear angular momentum)5-Magnetic dipole moment:μ(μ_N) = 1.7Nuclear g-factor:g_l = 0.34Year of discovery:1952

Radioactive Decay

Half-life T_½ = 363(14) d respectively 3.136 × 10⁷ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁴⁴Nd	100 %	2.332(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁸Eu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 144) with Promethium-144. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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