Chromium-61

Properties and data of the isotope ⁶¹Cr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Chromium-61; Cr-61Symbol:⁶¹Cr or 6124CrMass number A:61 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:37Isotopic mass:60.95440(11) u (atomic weight of Chromium-61)Nuclide mass:60.9412344 u (calculated nuclear mass without electrons)Mass excess:-42.47613 MeVMass defect:0.55400266 u (per nucleus)Nuclear binding energy:516.05015377 MeV (per nucleus)
8.45983859 MeV (average binding energy per nucleon)Separation energy:S_N = 3.88(22) MeV (first neutron)
S_P = 16.52(24) MeV (first proton)Half-life:237(11) msDecay constant λ:2.9246716479323 s^-1Specific activity α:2.935464105485 × 10⁺²² Bq g^-1
793368677158.16 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1985

Radioactive Decay

Half-life T_½ = 237(11) ms respectively 2.37 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶¹Mn	100 %	9.27(10) MeV
β^-, n	⁶⁰Mn	?	2.42(19) MeV

Parent Nuclides

Direct parent isotope is: ⁶¹V.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 61) with Chromium-61. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 37	Isobar A = 61
19	⁵⁶K
20	⁵⁷Ca
21	⁵⁸Sc	⁶¹Sc
22	⁵⁹Ti	⁶¹Ti
23	⁶⁰V	⁶¹V
24	⁶¹Cr	⁶¹Cr
25	⁶²Mn	⁶¹Mn
26	⁶³Fe	⁶¹Fe
27	⁶⁴Co	⁶¹Co
28	⁶⁵Ni	⁶¹Ni
29	⁶⁶Cu	⁶¹Cu
30	⁶⁷Zn	⁶¹Zn
31	⁶⁸Ga	⁶¹Ga
32	⁶⁹Ge	⁶¹Ge
33	⁷⁰As
34	⁷¹Se
35	⁷²Br
36	⁷³Kr
37	⁷⁴Rb
38	⁷⁵Sr
39	⁷⁶Y
40	⁷⁷Zr