Chromium-45m

Properties and data of the isotope ^45mCr.

Contents

General data

Name of the isotope:Chromium-45m; Cr-45mSymbol:^45mCr or 45m24CrMass number A:45 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:21Isotopic mass:44.97905(4) u (atomic weight of Chromium-45m)
Excitation energy: 50Nuclide mass:44.9658844 u (calculated nuclear mass without electrons)Mass excess:-19.5148 MeVMass defect:0.390714004 u (per nucleus)Nuclear binding energy:363.94775044 MeV (per nucleus)
8.08772779 MeV (average binding energy per nucleon)Half-life:0.001 s~Decay constant λ:693.14718055995 s^-1Specific activity α:9.486886268181 × 10⁺²⁴ Bq g^-1
2.564023315724 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+~

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
⁴⁵Cr		60.9(4) ms	(7/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 45) with Chromium-45m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 21	Isobar A = 45
9	³⁰F
10	³¹Ne
11	³²Na
12	³³Mg
13	³⁴Al
14	³⁵Si
15	³⁶P	⁴⁵P
16	³⁷S	⁴⁵S
17	³⁸Cl	⁴⁵Cl
18	³⁹Ar	⁴⁵Ar
19	⁴⁰K	⁴⁵K
20	⁴¹Ca	⁴⁵Ca
21	⁴²Sc	⁴⁵Sc
22	⁴³Ti	⁴⁵Ti
23	⁴⁴V	⁴⁵V
24	⁴⁵Cr	⁴⁵Cr
25	⁴⁶Mn	⁴⁵Mn
26	⁴⁷Fe	⁴⁵Fe
27	⁴⁸Co
28	⁴⁹Ni