Author: Khalifeh Abusaleem |  Citation: Nucl. Data Sheets 116, 163 (2014) |  Cutoff date: 31-Dec-2012 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=6441 keV SYS(n)= 3870 keV SYS(p)= 7885 keV SYQ(α)= 2493 keV SY
Reference: 2012WA38

General Comments:

2010Al24: 228At nuclide identified in 9Be(238U,X) reaction with a beam energy of 1 GeV/nucleon produced by the SIS synchrotron at GSI facility. Target=2500 mg/cm2. The fragment residues were analyzed with the high resolving power magnetic spectrometer Fragment separator (FRS). The identification of nuclei was made on the basis of magnetic rigidity, velocity, time-of-flight, energy loss and atomic number of the fragments using two plastic scintillators and two multisampling ionization chambers. The FRS magnet was tuned to center on 210Au, 216Pb, 219Pb, 227At and 229At nuclei along the central trajectory of FRS.

Unambiguous identification of nuclides required the separation of different charge states of the nuclei passing through the FRS. At 1 GeV/nucleon incident energy of 238U, fraction of fully stripped 226Po nuclei was about 89%. Through the measurement of difference in magnetic rigidity in the two sections of the FRS and the difference in energy loss in the two ionization chambers, the charge state of the transmitted nuclei was determined, especially, that of the singly charged (hydrogen-like) nuclei which preserved their charge in the current experimental setup. Measured production cross sections with 10% statistical and 20% systematic uncertainties

Comparisons of measured σ with model predictions using the computer codes COFRA and EPAX.

Q-value: Estimated uncertainties in 2012Wa38: 401 for Q(β-), 499 for S(n), 566 for S(p) and Q(α)

Q-value: Q(β-n)=727 syst 500 (2012Wa38)

  0 > 300 ns
% β- = ?

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Additional Level Data and Comments:

  0 > 300 ns
% β- = ?
Calculated %β-n=0.57 (1997Mo25).

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