Calcium-49

Properties and data of the isotope ⁴⁹Ca.

Content

General data

Name of the isotope:Calcium-49; Ca-49Symbol:⁴⁹Ca or 4920CaMass number A:49 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:29Isotopic mass:48.95562288(22) u (atomic weight of Calcium-49)Nuclide mass:48.9446515 u (calculated nuclear mass without electrons)Mass excess:-41.33702 MeVMass defect:0.452160324 u (per nucleus)Nuclear binding energy:421.18462884 MeV (per nucleus)
8.59560467 MeV (average binding energy per nucleon)Separation energy:S_N = 5.14645(18) MeV (first neutron)
S_P = 16.3043(8) MeV (first proton)Half-life:8.718(6) minDecay constant λ:0.0013251265209145 s^-1Specific activity α:1.662520534621 × 10⁺¹⁹ Bq g^-1
449329874.22214 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μ_N) = -1.3799(8)Nuclear g-factor:g_l = -0.91993333333333Year of discovery:1950

Radioactive Decay

Half-life T_½ = 8.718(6) min (minutes) respectively 5.2308 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁹Sc	100 %	5.2615(27) MeV

Parent Nuclides

Direct parent isotopes are: ⁴⁹K, ⁵⁰K.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 49) with Calcium-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 29	Isobar A = 49
13	⁴²Al
14	⁴³Si
15	⁴⁴P
16	⁴⁵S	⁴⁹S
17	⁴⁶Cl	⁴⁹Cl
18	⁴⁷Ar	⁴⁹Ar
19	⁴⁸K	⁴⁹K
20	⁴⁹Ca	⁴⁹Ca
21	⁵⁰Sc	⁴⁹Sc
22	⁵¹Ti	⁴⁹Ti
23	⁵²V	⁴⁹V
24	⁵³Cr	⁴⁹Cr
25	⁵⁴Mn	⁴⁹Mn
26	⁵⁵Fe	⁴⁹Fe
27	⁵⁶Co	⁴⁹Co
28	⁵⁷Ni	⁴⁹Ni
29	⁵⁸Cu
30	⁵⁹Zn
31	⁶⁰Ga
32	⁶¹Ge
33	⁶²As
34	⁶³Se