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Silicon-42

Properties and data of the isotope 42Si.


Content

See also: list of Silicon isotopes.

 

General data

Name of the isotope:Silicon-42; Si-42Symbol:42Si or 4214SiMass number A:42 (= number of nucleons)Atomic number Z:14 (= number of protons)Neutrons N:28Isotopic mass:42.01808(32) u (atomic weight of Silicon-42)Nuclide mass:42.0104 u (calculated nuclear mass without electrons)Mass excess:16.84141 MeVMass defect:0.334088096 u (per nucleus)Nuclear binding energy:311.2010569 MeV (per nucleus)
7.40954897 MeV (average binding energy per nucleon)
Separation energy:SN = 4.432(424) MeV (first neutron)
SP = 25.04(50) MeV (first proton)
Half-life:12.5(35) msDecay constant λ:55.451774444796 s-1Specific activity α:7.950914205714 × 10+23 Bq g-1
21488957312741 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Year of discovery:1990

 

Radioactive Decay

Half-life T½ = 12.5(35) ms respectively 1.25 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-42P100 %15.75(32) MeV
β-, n41P?13.748(323) MeV
β-, 2n40P?

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 28) and isobaric (same nucleon number A = 42) with Silicon-42. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 28Isobar A = 42
1139Na
1240Mg
1341Al42Al
1442Si42Si
1543P42P
1644S42S
1745Cl42Cl
1846Ar42Ar
1947K42K
2048Ca42Ca
2149Sc42Sc
2250Ti42Ti
2351V42V
2452Cr42Cr
2553Mn42Mn
2654Fe
2755Co
2856Ni
2957Cu
3058Zn
3159Ga
3260Ge

 

External data and identifiers

Adopted Levels, Gammas:NuDat 42Si

 

Literature and References

[1] - J. Fridmann, I. Wiedenhöver, A. Gade et al.:
Magic Nucleus 42Si.
In: Nature, 435, 922 – 924, (2005), DOI 10.1038/nature03619.

[2] - A. Gade, B. A. Brown, J. A. Tostevin et al.:
Is the Structure of 42Si Understood?.
In: Physical Review Letters, 122, 222501, (2019), DOI 10.1103/PhysRevLett.122.222501.

 


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Last update: 2023-10-09


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