Chlorine-38m

Properties and data of the isotope ³⁸Cl.

Content

General data

Name of the isotope:Chlorine-38m; Cl-38mSymbol:³⁸Cl or 3817ClMass number A:38 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:21Isotopic mass:37.96801041(11) u (atomic weight of Chlorine-38m)
Excitation energy: 671.365(8) keVNuclide mass:37.9586847 u (calculated nuclear mass without electrons)Mass excess:-29.79811 MeVMass defect:0.34697837 u (per nucleus)Nuclear binding energy:323.20826978 MeV (per nucleus)
8.50548078 MeV (average binding energy per nucleon)Half-life:715(3) msDecay constant λ:0.96943661616776 s^-1Specific activity α:1.577860501984 × 10⁺²² Bq g^-1
426448784320.14 Ci g^-1Spin and parity:
(nuclear angular momentum)5-

Radioactive Decay

Half-life T_½ = 715(3) ms respectively 7.15 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	³⁸Cl	100 %	0.671 MeV

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
³⁸Cl		37.230(14) min	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 = 38) with Chlorine-38m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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