Protactinium-234m

Properties and data of the isotope ^234mPa.

Contents

General Data

Radioactive Decay

Isotones und Isobares

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

General data

Name of the isotope:Protactinium-234m; Pa-234mSymbol:^234mPa or 234m91PaMass number A:234 (= number of nucleons)Atomic number Z:91 (= number of protons)Neutrons N:143Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5714285714286 (= neutron-proton ratio)Neutron excess (N-Z):52Excitation energy:73.92+x keVIsotopic mass:234.043306(4) u (atomic weight of Protactinium-234m)Nuclide mass:233.9933917 u (calculated nuclear mass without electrons)Mass excess:40.33928 MeVMass defect:1.9078549 u (per nucleus)Nuclear binding energy:1777.15539222 MeV (per nucleus)
7.59468116 MeV (average binding energy per nucleon)Half-life:1.159(11) minDecay constant λ:0.0099676039769909 s^-1Specific activity α:2.565227144679 × 10⁺¹⁹ Bq g^-1
693304633.69722 Ci g^-1Spin and parity:
(nuclear angular momentum)(0-)

Radioactive Decay

Half-life T_½ = 1.159(11) min (minutes) respectively 6.954 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²³⁴U	99.84(4) %
Iso	²³⁴Pa	0.16(4) %

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
²³⁴Pa		6.70(5) h	4+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 143) and isobaric (same nucleon number A = 234) with Protactinium-234m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 143	Isobar A = 234
84	²²⁷Po
85	²²⁸At
86	²²⁹Rn
87	²³⁰Fr
88	²³¹Ra	²³⁴Ra
89	²³²Ac	²³⁴Ac
90	²³³Th	²³⁴Th
91	²³⁴Pa	²³⁴Pa
92	²³⁵U	²³⁴U
93	²³⁶Np	²³⁴Np
94	²³⁷Pu	²³⁴Pu
95	²³⁸Am	²³⁴Am
96	²³⁹Cm	²³⁴Cm
97	²⁴⁰Bk	²³⁴Bk
98	²⁴¹Cf
99	²⁴²Es
100	²⁴³Fm
101	²⁴⁴Md