The project of the mass separator of atomic nuclei produced in heavy ion induced reactions

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 204; pp. 606 - 613
• Main Authors: Oganessian, Yu.Ts, Shchepunov, V.A., Dmitriev, S.N., Itkis, M.G., Gulbekyan, G.G., Khabarov, M.V., Bekhterev, V.V., Bogomolov, S.L., Efremov, A.A., Pashenko, S.V., Stepantsov, S.V., Yeremin, A.V., Yavor, M.I., Kalimov, A.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2003
• Subjects: Mass analyzer; Separator; Super heavy elements; 29.30.Aj; Mass analyzer; 25.70.Jj; Separator; Super heavy elements
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/S0168-583X(02)02138-9

A new separator and mass analyzer, named MASHA (mass analyzer of super heavy atoms), has been designed at the Flerov Laboratory JINR Dubna to separate and measure masses of nuclei and molecules with precision better than 10 −3. The set up can work in the wide mass range from A≈20 to A≈500, its mass acceptance is as large as ±2.8%. In particular, it allows unambiguous mass identification of super heavy nuclei with a resolution better than 1 amu at the level of 300 amu. Synthesized in nuclear reactions nuclides are emitted from an ECR ion source at energy E=40 kV and charge state Q=+1. Then they pass the following steps of separation and analysis: the first section of rough separation, the second section of separation and mass analysis and the final section of separation with a 90° electrostatic deflector. In the focal plane of the device, a focal plane detector determines positions (masses) of studied nuclei. Ion optics of the analyzer, optimized up to the second order, is considered. Description of its elements and subsystems is given.