| 日時: |
2006-10-26 14:30 - 16:30 |
| 場所: |
筑波大学応用加速器部門3階大会議室 |
| 会議名: |
第14回つくば不安定核セミナー |
| 連絡先: |
筑波大学物理学系 小沢顕 ozawa tac.tsukuba.ac.jp |
| 講演者: |
Prof. Wolfgang Mittig (GANIL) |
| 講演言語: |
英語 |
| アブストラクト: |
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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