Observation of bound excited states in15B.

The structure of theA/Z = 3 nucleus15B has been investigated using the in-beam-spectroscopy technique with a fragmentation reaction of a36S beam on a9Be target at 77.5. The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph.-ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the-coincidence relationships a level scheme is proposed for15B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in thepsdvalence space. Effects of the weakly bound nature of the valence neutrons have been observed. [ABSTRACT FROM AUTHOR]