[Triumf-seminars] TRIUMF ISAC Seminar today at 15:00

[postmaster at admin.triumf.ca]

Date/Time: Wed 2007-01-17 at 15:00

Location:  Auditorium          

Speaker:   Wolfgang Mittig (GANIL)

Title:     Mass Measurements Far From Stability: From Bound to Unbound States

Abstract: In a first part, recent results using the SPEG-time-of-flight method for mass measurements  are presented for very neutron-rich nuclei situated around neutron numbers N=20 and N=28. Seven masses have been measured for the first time, and the precision of 36 masses has been significantly improved. These results are used to investigate the evolution of the odd-even staggering of binding energies with neutron number. Especial attention is paid to the evolution of shell closure N=28 when approaching the neutron dripline. Changes in shell structure are observed around N=28 for P and S isotopes but not for Si isotopes. This could be interpreted as the persistence of shell closure N=28 or as the result of a very sudden change in deformation arising at N=28 for 42Si. In a second part, present developments of the active target MAYA will be shown, illustrated by the measurement of unbound states in nuclei beyond the dripline.



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