Promethium-134m

Properties and data of the isotope ^134mPm.

Contents

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

General data

Name of the isotope:Promethium-134m; Pm-134mSymbol:^134mPm or 134m61PmMass number A:134 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:73Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1967213114754 (= neutron-proton ratio)Neutron excess (N-Z):12Excitation energy:+ x keVIsotopic mass:133.92835(6) u (atomic weight of Promethium-134m)Nuclide mass:133.8948892 u (calculated nuclear mass without electrons)Mass excess:-66.74155 MeVMass defect:1.18151582 u (per nucleus)Nuclear binding energy:1100.57489724 MeV (per nucleus)
8.2132455 MeV (average binding energy per nucleon)Half-life:22(1) sDecay constant λ:0.31506690025452 s^-1Specific activity α:1.426599438824 × 10⁺²¹ Bq g^-1
38556741589.846 Ci g^-1Spin and parity:
(nuclear angular momentum)(5+)

Radioactive Decay

Half-life T_½ = 22(1) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹³⁴Nd	100 %

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
¹³⁴Pm		5 s	(2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 73) and isobaric (same nucleon number A = 134) with Promethium-134m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 73	Isobar A = 134
41	¹¹⁴Nb
42	¹¹⁵Mo
43	¹¹⁶Tc
44	¹¹⁷Ru
45	¹¹⁸Rh
46	¹¹⁹Pd
47	¹²⁰Ag
48	¹²¹Cd	¹³⁴Cd
49	¹²²In	¹³⁴In
50	¹²³Sn	¹³⁴Sn
51	¹²⁴Sb	¹³⁴Sb
52	¹²⁵Te	¹³⁴Te
53	¹²⁶I	¹³⁴I
54	¹²⁷Xe	¹³⁴Xe
55	¹²⁸Cs	¹³⁴Cs
56	¹²⁹Ba	¹³⁴Ba
57	¹³⁰La	¹³⁴La
58	¹³¹Ce	¹³⁴Ce
59	¹³²Pr	¹³⁴Pr
60	¹³³Nd	¹³⁴Nd
61	¹³⁴Pm	¹³⁴Pm
62	¹³⁵Sm	¹³⁴Sm
63	¹³⁶Eu	¹³⁴Eu
64	¹³⁷Gd	¹³⁴Gd
65	¹³⁸Tb
66	¹³⁹Dy
67	¹⁴⁰Ho