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Production of intense beams of fission fragments at MAFF : Papers from the Ninth International Conference on Ion Sources (2002)

Bongers, H. ; Gross, M. ; Habs, D. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 73 (2002), S. 809-811

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: At the new Munich high flux reactor FRM-II, the Munich Accelerator for Fission Fragments (MAFF) is under development. The main objective will be the production and study of new very heavy elements (Z〉100). To obtain this goal, intense beams of neutron rich isotopes (70〈A〈160) are required. Thermal neutron induced fission is considered the most suitable method to produce these isotopes due to the large fission cross section and high thermal neutron flux (〉1014 n/s*cm2) available at the new reactor. The target ion source design is based on the ANUBIS source at OSIRIS in Studvik, optimized for very high neutron fluxes. Using 1 g of 235U diluted in a graphite target, intensities of several 1011 ions/s for 91Kr, 132Sn, or 144Cs, e.g., are expected after mass separation. These singly charged ions will be charge bred in an electron cyclotron resonance ion source and then injected into the MAFF-LINAC to reach the energies at the Coulomb barrier. The production of intense ion beams of neutron rich isotopes by thermal neutron induced fission, the development of the target ion source, and the development of the fission target will be presented. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1430516

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Effect of wash bulk on the accuracy of polyvinyl siloxane putty-wash impressions (2002)

Nissan, J. ; Gross, M. ; Shifman, A. ; [et al.]

Oxford UK : Blackwell Science Ltd

Journal of oral rehabilitation 29 (2002), S. 0

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ISSN: 1365-2842

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Variations in the bulk of wash in a putty-wash impression technique can result in dimensional changes proportional to the thickness of the wash material during setting. The purpose of the study was to determine the amount of wash necessary to achieve accurate stone models while using a two-step putty-wash impression technique with polyvinyl siloxane (PVS) impression material. A total of 45 impressions were made of a stainless steel master model, 15 impressions for each wash thickness (1, 2 and 3 mm). The model contained three full-crown abutment preparations, which were used as the positive control. Accuracy was assessed by measuring six dimensions (occlusogingival and interabutments) on stone dies poured from impressions of the master model. One-way analysis of variance (ANOVA) showed statistically significant differences amongst the three wash bulk groups, for all occlusogingival and interabutment measurements (P 〈 0·001). The overall discrepancies of the groups using wash thickness of 1 and 2 mm were smaller than the group with 3 mm wash thickness. Therefore, wash bulks of 1 and 2 mm were most accurate for fabricating stone dies, using PVS impression materials. This can be achieved by using the temporary crown to create the desired wash space in the preliminary putty impression. Wash thickness 〉 2 mm was inadequate to obtain accurate stone dies.