Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 172, 1 (2021) |  Cutoff date: 31-Jan-2021 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-7.46×103 keV 16S(n)= 11010 keV SYS(p)= 1.67×103 keV 18Q(α)= -2.23×103 keV 20
Reference: 2017WA10

  A  100Sn ε decay (1.18 S) 

General Comments:

Other measurements:

1982Ku15: tentative identification from observation of delayed proton activity in a mass separated sample from 63Cu(40Ca,3n) reaction

1995Sc33: 100In produced in 9Be(124Xe,X) E=1095 MeV/nucleon. Measured half-life

1995Sz01: 100In produced by 50Cr(58Ni,3p5n),E=5.6 MeV/nucleon followed by mass separation. Measured β+p by ΔE-E telescope, γ, 511-γ coin, β+, total γ absorption, T1/2

1996Ch32 (also 1996Ch26,1997Mi07,1997Le36): 58Ni(50Cr,3p5n) E=5.3 MeV/nucleon at GANIL facility. Silicon detector telescope. Measured mass. Measured mass excess=-64.65 MeV 32, relative to that of 100Ag. Production cross section ≈1 μb (1997Mi07)

2000La09: 50Cr(58Ni,X) E=249, 348 MeV. Measured production cross section:

2002Pl03 (also 2003Pl02): 100In produced by 50Cr(58Ni,3p5n) E=5.6 MeV/nucleon at GSI facility followed by mass separation. Measured Eγ, Iγ, γγ, βγγ, (p)(TAS) coin, lifetimes in high resolution experiment using a HPGe detector, an EUROBALL-type cluster, a superclover from the VEGA array, and a low-energy photon spectrometer, and in a total-absorption experiment (TAS) using a large NaI(Tl) crystal, ancillary detectors, two Si detectors and one Ge detector. Deduced probability of delayed proton decay mode.

2008KrZW: 9Be(124Xe,X) E=1 GeV/nucleon. Measured yields using RISING array for γ rays at GSI facility

2012Lo08: 100In produced from fragmentation of a 112Sn beam at E=120 MeV/nucleon on a 195 mg/cm2 9Be target at the National Superconducting Cyclotron Laboratory (NSCL-MSU). Fragments separated by the A1900 Fragment Separator and the Radio Frequency Fragment Separator (RFFS). Ions were implanted in the double-sided silicon strip detector (DSSD). Detection system: NSCL Beta Counting System in conjunction with the SeGA Array of 16 HPGe detectors. Measured Eγ, Iγ, β spectra, E(p), I(p), βγ-coin, βp-coin, γβp-coin, half-life, β-delayed proton emission probability. Total of 756 βp coin events identified.

2019Pa16: E(124Xe)=345 MeV/nucleon beam incident on a 740 mg/cm2 thick 9Be target at the RIKEN-RIBF facility. The identification of the nuclide of interest was made through the BigRIPS separator and the ZeroDegree spectrometer by determining the atomic number and the mass-to-charge ratio of the ion using the tof-Bρ-ΔE method. The secondary beam was stopped in the double-sided silicon strip detector of the WAS3ABi spectrometer. The γ rays were detected by EURICA array comprising of 84 HPGe detectors. Measured Eγ, βγ-coin, βp-coin, βpγ-coin, half-lives by βγ(t), βp(t). Comparisons with previous experimental data and shell-model calculations.

Theory references: consult the NSR database ( for 12 primary references dealing with nuclear structure calculations.

The proposed level scheme is tentative, except for the 1+ definite level at about 2.72 MeV. It is based on experimental observation of five gamma rays and a theoretical level scheme from large-scale shell model calculations (2012Hi07)

Q-value: Q(β- from averaged β-endpoint energy=3.69 MeV 16 (from 3.91 MeV 15 in 2019Lu08, 3.29 MeV 20 in 2012Hi07, 3.8 MeV +7-3 in 2002Fa13, and 3.4 MeV +7-3 in 1997Su06 and 1996Ki23 to the 2720+x level in 100In, and assuming x=25 keV 25. Other: 7.03 MeV 24 (2017Wa10, based on data in 2012Hi07, 2002Fa13, 1997Su06 and 1996Ki23)

Q-value: Estimated uncertainty=350 in S(n) (2017Wa10).

Q-value: S(2n)=26560 350 (syst), S(2p)=5820 190, Q(εp)=5110 180 (2017Wa10)

XREFJπ(level) T1/2(level)E(γ)
I(γ)M(γ)Final Levels
       0.0A (6+) 5.65 s 6 
% ε = 100
% εp = 1.66 3
     0+XA (5+)        
    95+X 1 A (4+)       95 1 
   236+X 1 A (3+)      141 1 
   672+X 2 A (2+)      436 1 

  1423+X 1 SA (2+)        
  2720+X 2 A 1+     1297 1 
  2048 1 
  136 49 
  100 49 


Jπ(level): From large-scale shell model calculations (2012Hi07); levels have almost pure configuration=πg9/2-1~#νg7/21 or belong to πg9/2-1~#νd5/21 multiplet

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Additional Gamma Data:

Additional Data
    95+X (4+)       95 1 [M1]0.573α=0.573 19
   236+X (3+)      141 1 [M1]0.196α=0.196 5

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Additional Level Data and Comments:

       0.0(6+) 5.65 s 6 
% ε = 100
% εp = 1.66 3
%εp: from weighted average of 1.66 3 (2019Pa16); 1.7 4 (2012Lo08, observation of 756 βp coincidence events); and 1.6 3 (2002Pl03, proton-TAS coin spectrum). Other: >3.9 (1995Sz01, estimated from singles proton spectrum).
  2720+X1+   Dominant configuration=πg9/29~#νg7/21.

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