ADOPTED LEVELS for 35K

Authors: Lijie Sun and Jun Chen |  Citation: Nucl. Data Sheets 211, 1 (2026) |  Cutoff date: 30-Sep-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1.595×104 keV 11S(n)= 17757 keV 17S(p)= 83.6 keV 5Q(α)= -6563 keV 3
Reference: 2021WA16

References:
  A  35Ca EC+B+ decay (25.7 MS)  B  9Be(36Ca,35K)
  C  40Ca(3He,8Li) 

General Comments:

Isotope discovery (2012Th10): 40Ca(3He,8Li)35K at Michigan State (1976Be08).

35K decay measurements:

1980Ew02,1979Ca15: 35K produced via 45Sc(p,8N3p) spallation at CERN. Measured T1/2 and ε+β+-delayed protons and γ rays.

2018Sa54,2019ChZU: 35K produced via 1H(36Ar,35K)2n at Texas A&M. Measured T1/2 and ε+β+-delayed protons and γ rays.

1998Sc19: Polarized 35K produced via fragmentation of 40Ca on 9Be target at GSI. Measured T1/2 and g-factor of 35K ground state from β-NMR.

2006Me04: Polarized 35K produced via 36Ar(9Be,10Li)35K at NSCL, MSU. Measured g-factor of 35K ground state from β-NMR.

35K mass measurements: 2023Zh10, 2007Ya08, 1976Be08.

Theoretical calculations (binding energies, moments, radii, levels, J, π, mass, T1/2, reaction rates, etc.): 2025Sh19, 2023Bo17, 2023Fo05, 2022Zo01, 2020Ma25, 2016Si02, 2016Me17, 2003Sm02.

Q-value: S(2n)=34860 200 (syst), S(2p)=4747.5 6, Q(ε)=11874.4 9, Q(εp)=5978.2 5 (2021Wa16)






E(level)
(keV)		XREFJπ(level) T1/2(level)
     0.0ABC 3/2+ 175 ms 2 
% ε = 100
% εp = 0.37 15
  1553 5 A C (1/2)+  
  2690 50   C  
  3781 26 A   1/2+,3/2+  
  4018 37 A   1/2+,3/2+  
  4788 49 A   1/2+,3/2+  
  4982 13 A   1/2+,3/2+  
  5249 73 A   1/2+,3/2+  
  5533 49 A   1/2+,3/2+  
  5710 49 A   1/2+,3/2+  
  5865 38 A   1/2+,3/2+  
  6089 62 A   1/2+,3/2+  
  6335 73 A   1/2+,3/2+  
  9168 23 A   1/2+  

E(level): From 35Ca ε+β+ decay, unless otherwise noted

Jπ(level): Allowed ε+β+ feeding from 1/2+ 35Ca parent, unless otherwise noted.

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.03/2+ 175 ms 2 
% ε = 100
% εp = 0.37 15
μ=(+)0.392 (2006Me04,2019StZV)
%εp: from 1980Ew02 for E(p)>0.9 MeV. E(p)<0.9 MeV has also been observed (2018Sa54,2019ChZU).
E(level): %εp: from 1980Ew02 for E(p)>0.9 MeV. E(p)<0.9 MeV has also been observed (2018Sa54,2019ChZU).
  2690   Possible mirror level of 2717, 5/2+ level in 35S (1976Be08).
E(level): Possible mirror level of 2717, 5/2+ level in 35S (1976Be08).

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