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Research Highlight | Argonne National Laboratory

Superallowed α Decay to Doubly Magic 100Sn

In a study published in the American Physical Society, the superallowed α decay chain 108Xe-104Te-100Sn into the self-conjugate doubly magic 100Sn nucleus was observed.

Scientific Achievement

The superallowed α decay chain 108Xe-104Te-100Sn into the self-conjugate doubly magic 100Sn nucleus was observed.

Significance and Impact

This observation will help to improve models of α decay and will shed light on the clustering phenomenon in nuclei.

Research Details

  • α decay of 104Te is only the second instance, besides 212Po, of a emission into a doubly magic nucleus
  • 108Xe, 104Te are first self-conjugate (the same number of protons and neutrons) α emitters ever observed
  • α particle preformation factor in 108Xe or 104Te is at least factor of 5 larger than for 212Po indicating superallowed α decay
  • enhanced α particle formation could be the result of strong proton-neutron interaction in N=Z nuclei

DOI: https://​doi​.org/​10​.​1103​/​P​h​y​s​R​e​v​L​e​t​t​.​121​.​182501

Work was done using the Fragment Mass Analyzer at the Argonne Physics Division ATLAS facility.

Figure 1: Implantation of 108Xe+26,27 ions, selected by  the Fragment Mass Analyzer, into a double-sided Si strip detector (DSSD), followed by the detection of 108Xe-104Te α particles in rapid succession in the DSSD and the surrounding BOX detector.