The ion-optical design of the MARA recoil separator and absolute transmission measurements of the RITU gas-filled recoil separator
In this thesis work, the use of two complementary recoil separators for studies
of nuclear structure via fusion-evaporation reactions are discussed. The design
and the main ion-optical properties of the vacuum-mode recoil-mass separator
MARA, intended for studies of nuclei with N Z close to the proton drip-line,
are presented. MARA (Mass Analysing Recoil Apparatus) consists of a magnetic
quadrupole triplet followed by an electrostatic de
ector and a magnetic
dipole. The working principle of MARA is discussed and the reasons for the
choice of the optical parameters of the elements are given. The performance of
MARA for di erent kind of fusion reactions has been studied with Monte Carlo
simulations. The results of a sensitivity analysis especially of the electrostatic
de
ector are reported. The requirements for the instrumentation are discussed.
The absolute transmission values of the RITU gas- lled recoil separator have
been measured for several fusion evaporation products in the mass region
A = 170{190 using di erent reaction asymmetries. It was observed that the
angular distribution of products after the target and the angular acceptance
of RITU determine the transmission value accurately. The e ects of lling-gas
pressure on the average charge state and focal plane image properties as well
as on transmission values have been studied experimentally. The transmission
probability for 254No synthesized in the 48Ca+208Pb reaction has been calculated
and is in agreement with the experiment. Simulations of transportation
of 186Hg fusion products through RITU have been carried out. The simulated
behaviour of transmission and image properties agrees well with an experiment.
...
Publisher
University of JyväskyläISBN
978-951-39-4512-1ISSN Search the Publication Forum
0075-465XKeywords
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- Väitöskirjat [3560]
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