Abstract
The decay rate of 22Na implanted in aluminium has been measured at room temperature and at 10 K. The rate should increase by 40% according to Rolfs (2006 Public Lecture for SLENA (Kolkata, India)) and by about 6% according to Limata et al (2006 Eur. Phys. J. A 28 251). In the latter publication, an increase of only 1.2 ± 0.2% has been measured and the deviation has been assigned to an incomplete implantation of 22Na in the palladium sheet. Contrary, the source used for our measurements has been made by a 70 MeV proton beam penetrating an aluminum sheet, therefore the 22Na was produced deep inside the metal and the full effect should be visible when cooling the sample. We did not see an enhanced decay rate within the precision limit (0.04%) of our measurement.
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