Total reaction cross section measurements at intermediate energy for the proton halo candidate Al-23 and its neighbours

Total reaction cross sections sigma (R) for some proton-rich isotones (N = 10) near Al-23 on a carbon target have been measured at intermediate energi es in the experiment performed at the Radioactive Ion Beam Line of the Heav y Ion Research Facility in Lanzhou. The Z-dependence Of sigma (R) shows a r emarkable enhancement for Al-23 relative to its neighbours. The difference factor d has been deduced from the measured sigma (R) by using the Glauber or Boltzmann-Uehling-Uhlenbeck models. From the above analysis, a possible one-proton halo structure is suggested for Al-23.