Promethium-141m2

Properties and data of the isotope ¹⁴¹Pm.

Content

General data

Name of the isotope:Promethium-141m2; Pm-141m2Symbol:¹⁴¹Pm or 14161PmMass number A:141 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:80Isotopic mass:140.913555(15) u (atomic weight of Promethium-141m2)
Excitation energy: 2530.75(17) keVNuclide mass:140.8800942 u (calculated nuclear mass without electrons)Mass excess:-80.523 MeVMass defect:1.256965232 u (per nucleus)Nuclear binding energy:1170.85557182 MeV (per nucleus)
8.30394023 MeV (average binding energy per nucleon)Half-life:2 µsDecay constant λ:0.34657359027997 s^-1Specific activity α:1.490796413571 × 10⁺²¹ Bq g^-1
40291794961.389 Ci g^-1Spin and parity:
(nuclear angular momentum)

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
¹⁴¹Pm		20.90(5) min	5/2+
^141m1Pm	628.62(7) keV	0.63(2) μs	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 141) with Promethium-141m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 141
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In
50	¹³⁰Sn
51	¹³¹Sb	¹⁴¹Sb
52	¹³²Te	¹⁴¹Te
53	¹³³I	¹⁴¹I
54	¹³⁴Xe	¹⁴¹Xe
55	¹³⁵Cs	¹⁴¹Cs
56	¹³⁶Ba	¹⁴¹Ba
57	¹³⁷La	¹⁴¹La
58	¹³⁸Ce	¹⁴¹Ce
59	¹³⁹Pr	¹⁴¹Pr
60	¹⁴⁰Nd	¹⁴¹Nd
61	¹⁴¹Pm	¹⁴¹Pm
62	¹⁴²Sm	¹⁴¹Sm
63	¹⁴³Eu	¹⁴¹Eu
64	¹⁴⁴Gd	¹⁴¹Gd
65	¹⁴⁵Tb	¹⁴¹Tb
66	¹⁴⁶Dy	¹⁴¹Dy
67	¹⁴⁷Ho	¹⁴¹Ho
68	¹⁴⁸Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu