Examining exotic structure of proton-rich nucleus 23Al
Abstract
The longitudinal momentum distribution (P//) of fragments after one-proton removal from 23 Al and reaction cross sections (σR) for 23,24 Al on carbon target at 74A MeV have been measured. The 23,24 Al ions were produced through projectile fragmentation of 135 A MeV 28 Si primary beam using RIPS fragment separator at RIKEN. P// is measured by a direct time-of-flight (TOF) technique, while σR is determined using a transmission method. An enhancement in σR is observed for 23 Al compared with 24 Al. The P// for 22 Mg fragments from 23 Al breakup has been obtained for the first time. FWHM of the distributions has been determined to be 232 28 MeV/c. The experimental data are discussed by using Few-Body Glauber model. Analysis of P// demonstrates a dominant d-wave configuration for the valence proton in ground state of 23 Al, indicating that 23 Al is not a proton halo nucleus.
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