Promethium-141m1

Properties and data of the isotope ^141m1Pm.

Contents

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

General data

Name of the isotope:Promethium-141m1; Pm-141m1Symbol:^141m1Pm or 141m161PmMass number A:141 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:80Excitation energy:628.62(7) keVIsotopic mass:140.913555(15) u (atomic weight of Promethium-141m1)Nuclide 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:0.63(2) μsDecay constant λ:1100233.6199364 s^-1Specific activity α:4.732687027210 × 10⁺²⁷ Bq g^-1
1.279104601948 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

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+
^141m2Pm	2530.75(17) keV	2 µs

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-141m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	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