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Phosphorus-26

Properties and data of the isotope 26P.


Content

See also: list of Phosphorus isotopes.

 

General data

Name of the isotope:Phosphorus-26; P-26Symbol:26P or 2615PMass number A:26 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:11Isotopic mass:26.01178(21) u (atomic weight of Phosphorus-26)Nuclide mass:26.0035514 u (calculated nuclear mass without electrons)Mass excess:10.973 MeVMass defect:0.200909556 u (per nucleus)Nuclear binding energy:187.14604596 MeV (per nucleus)
7.19792484 MeV (average binding energy per nucleon)
Separation energy:SN = 17.288(445) MeV (first neutron)
SP = 0.143(196) MeV (first proton)
Half-life:43.7(6) msDecay constant λ:15.861491545994 s-1Specific activity α:3.673851397641 × 10+23 Bq g-1
9929328101733.2 Ci g-1
Spin and parity:
(nuclear angular momentum)
(3)+Isobaric spin: 2Mirror nucleus:Sodium-26Year of discovery:1983

 

Radioactive Decay

Half-life T½ = 43.7(6) ms respectively 4.37 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+26Si61.04 %18.11398 MeV
β+, p25Al36.8 %12.600 MeV
β+, 2p24Mg2.16 %10,329 MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 11) and isobaric (same nucleon number A = 26) with Phosphorus-26. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 11Isobar A = 26
415Be
516B
617C
718N
819O26O
920F26F
1021Ne26Ne
1122Na26Na
1223Mg26Mg
1324Al26Al
1425Si26Si
1526P26P
1627S26S
1728Cl

 

External data and identifiers

Adopted Levels, Gammas:NuDat 26P

 

Literature and References

[1] - Zhongzhou Ren, Baoqiu Chen, Zhongyu Ma, Gongou Xu:
One-proton halo in 26P and two-proton halo in 27S.
In: Physical Review C, (1996), DOI 10.1103/PhysRevC.53.R572.

[2] - D. Pérez-Loureiro et al.:
β-delayed γ decay of 26P: Possible evidence of a proton halo.
In: Physical Review C, 93, 064320, (2016), DOI 10.1103/PhysRevC.93.064320.

 


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Last update: 2023-10-11


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