Chromium-59m

Properties and data of the isotope ^59mCr.

Contents

General data

Name of the isotope:Chromium-59m; Cr-59mSymbol:^59mCr or 59m24CrMass number A:59 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:35Isotopic mass:58.94838(23) u (atomic weight of Chromium-59m)
Excitation energy: 502.7(11) keVNuclide mass:58.9352144 u (calculated nuclear mass without electrons)Mass excess:-48.08372 MeVMass defect:0.542692828 u (per nucleus)Nuclear binding energy:505.51511313 MeV (per nucleus)
8.56805276 MeV (average binding energy per nucleon)Half-life:96(20) μsDecay constant λ:7220.2831308328 s^-1Specific activity α:7.496821045258 × 10⁺²⁵ Bq g^-1
2.026167850069 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)

Radioactive Decay

Half-life T_½ = 96(20) μs respectively 9.6 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁵⁹Cr	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
⁵⁹Cr		0.74(28) s	(1/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 59) with Chromium-59m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 35	Isobar A = 59
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc	⁵⁹Sc
22	⁵⁷Ti	⁵⁹Ti
23	⁵⁸V	⁵⁹V
24	⁵⁹Cr	⁵⁹Cr
25	⁶⁰Mn	⁵⁹Mn
26	⁶¹Fe	⁵⁹Fe
27	⁶²Co	⁵⁹Co
28	⁶³Ni	⁵⁹Ni
29	⁶⁴Cu	⁵⁹Cu
30	⁶⁵Zn	⁵⁹Zn
31	⁶⁶Ga	⁵⁹Ga
32	⁶⁷Ge	⁵⁹Ge
33	⁶⁸As
34	⁶⁹Se
35	⁷⁰Br
36	⁷¹Kr
37	⁷²Rb
38	⁷³Sr