Concept of a high-resolution online mass separator for the Munich fission fragment accelerator

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• 作者：Thirolf ; P. ; Habs ; D. ; Kester ; O. ; Rudolph ; D. ; Schramm ; U. ; Von Egidy ; T. ; Faestermann ; T. ; Hinderer ; G. ; et. al.
• 关键词：Super heavy elements ; Mass separator ; Penning trap ; Fission fragments ; Ion guide system
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：1996
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：April, 1996
• 卷：126
• 期：1-4
• 页码：242-245
• 文件大小：335 K

摘要

A fission fragment accelerator combined with the Munich high-flux reactor FRM-II is under design for the delivery of intense beams of mass separated very neutron-rich fission fragments with energies at the Coulomb barrier. They can be used to produce very heavy neutron-rich nuclei in fusion reactions. The large neutron excess will result in much longer lifetimes of the produced heavy elements, compared to neutron-deficient ones produced in reactions with stable nuclear beams. Thus fast α-chains can no longer be used to identify the heavy reaction products. A new separator will be used consisting of a velocity filter, an ion guide system (IGISOL) and a Penning trap. The velocity filter separates the primary beam and results in a strong background suppression. The IGISOL system improves the emittance and enriches the 1⁺ ions in the beam, which will then be efficiently transferred into a Penning trap. In the Penning trap the ions are bunched, stopped and mass separated with high resolving power (R 10⁵).