Authors: Balraj Singh, Sukhjeet Singh |  Citation: ENSDF |  Cutoff date: 08-Mar-2022 

Authors: Sukhjeet Singh, Balraj Singh |  Citation: Nucl. Data Sheets 130, 127 (2015) |  Cutoff date: 15-Oct-2015 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=2200 keV SYS(n)= 5240 keV SYS(p)= 9620 keV SYQ(α)= 3360 keV SY
Reference: 2021WA16

General Comments:

2010Al24: 224Po 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 statistical uncertainty<10% and systematic uncertainty≈20%

Criterion established in 2010Al24 for acceptance of identification of a new nuclide: 1. number of events should be compatible with the corresponding mass and atomic number located in the expected range of positions at both image planes of the FRS spectrometer; 2. number of events should be compatible with >95% probability that at least one of the counts does not correspond to a charge-state contaminant. Comparisons of measured σ with model predictions using the computer codes COFRA and EPAX.

Theoretical calculations: two references extracted from the NSR database are listed in document records.

Q-value: Estimated uncertainties in 2021Wa16: 200 for Q(β-), 280 for S(n) 450 for S(p) and Q(α)

Q-value: S(2n)=8720 200 (syst,2021Wa16), S(2p)=17500 (2019Mo01,theory)

Jπ(level) T1/2(level)
  0 0+ % β- = 100

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Additional Level Data and Comments:

  00+ % β- = 100
The β- decay is the only decay mode expected.

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