MASHA facility was built for identification of superheavy elements (SHE) by their mass-to-charge ratios. The yields of SHE in full fusion reactions 48Ca + 238U, 48Ca + 242Pu, 48Ca + 244Pu is very low due to its low cross-sections of several nanobarns. That is why the reactions of Hg formations as the possible homologue of 112 and 114 were used for the test experiments. The separation efficiency of mercury could predict the separation efficiency of superheavy elements and thus predict its expected yields.
Tasks
To perform the mass measurement and determination of short-lived isotopes of Hg (as the homologue to SHE), Rn and its daughter nuclei by α-decay chains at position sensitive Si detector. Simultaneous yield measurements of Cn, Fl, and Hg.
Preliminary schedule by topics/tasks
1. Introduction lecture
2. Main parts overview+literature observation
3. Experimental data gathering
4. Data analysis using OriginPro software and chart of nuclides
5. Discussion of the results with the supervisor
6. Preparation of the final report
Required skills
Knowledge of:
- the principles of nuclear reactions
- conservation of energy, mass, momentum, and charge laws
- the principles of magnetic mass-spectrometry
- OriginPro software to construct and analyze graphs.
Fluent use of the table of nuclides.
Acquired skills and experience
- advanced knowledge in acceleration technology
- principles of semiconductor detectors work
- parts used at MASHA installation
- mass-to-charge spectrometry
- knowledge of superheavy elements production at accelerators
- neutron evaporation residues reactions of full-fusion.
Recommended literature
1. Chemical identification of Dubnium as a decay product of element 115 produced in the reaction 48Ca + 243Am. S.N. Dmitriev, Yu.Ts. Oganessyan, V.K. Utyonkov et al. Dubnium as a decay product.
2. Chemical characterization of element 112. R. Eichler, N. V. Aksenov, A. V. Belozerov et al. Nature. Letters. Vol. 447, May 2007.
3. The current status of MASHA setup. V. Yu. Vedeneev, A.M. Rodin, L.Krupa. Hyperfine Interactions 238:19 (2017).
4. MASHA Separator on the Heavy Ion Beam for Determining Masses and Nuclear Physical Properties of Isotopes of Heavy and Superheavy Elements. A.M. Rodin, A.V. Belozerov, D.V. Vanin. Instruments and Experimental Techniques, 2014, Vol. 57, No. 4, pp. 386–393. © Pleiades Publishing, Ltd., 2014.
