A clear signature of the breakup modes for 9Be on a proton target at 5.6 MeV/nucleon

A Pakou ,A Hacisalihoglou ,I Martel ,F Cappuzzello ,M Cavallaro ,C Parascandolo ,Á M Sánchez-Benítez ,E Strano ,C Agodi ,D Torresi ,A Foti ,L Acosta ,N Deshmukh ,M Mazzocco ,D Carbone ,N Keeley ,G A Souliotis ,M La Commara ,V Soukeras ,A Spatafora ,O Sgouros ,G Santagati ,A Boiano ,A Muoio ,K Rusek ,D Pierroutsakou ,A Trzcińska

doi:10.1088/1742-6596/1643/1/012102

Abstract

The breakup of 9Be is studied via an inelastic scattering experiment on a proton target at 5.6 A MeV in inverse kinematics. Two of the three cluster constituents (α and α) as well as the proton target recoil were recorded in a triple coincidence mode allowing a full kinematics approach analysis. In this respect relative α - α and α - n, Q-value and 9Be excitation spectra, energy spectra for all fragments as well as the energy spectrum of the recoil proton were reconstructed. A clear signature of the two breakup sequential modes (5He + 4He and 8Be + n) was identified via the recoiling proton reconstructed spectra together with the direct breakup decay. A strong 5He + 4He mode was observed compatible with previous beta decay experiments.

Highlights

With the advent of radioactive beam facilities, studies with weakly bound nuclei either radioactive or the stable ones, have been pursued in several laboratories
Two of the three cluster constituents (α and α) as well as the proton target recoil were recorded in a triple coincidence mode allowing a full kinematics approach analysis
Amongst the most interesting weakly bound nuclei, the Borromean nuclei attract a vivid interest in the nuclear physics community