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Content Introduction Synthesis of SHE at the Dubna Gas-filled Recoil Separator – detection system

Yu.Tsyganov RT 2010, Lisbon.

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Content Introduction Synthesis of SHE at the Dubna Gas-filled Recoil Separator – detection system

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  1. Yu.Tsyganov RT 2010, Lisbon Method of active correlations: present statusYu.S.Tsyganov, A.N.Polyakov, A.M.Sukhov, V.G.Subbotin, A.A.VoinovFLNR, JINRAbstractDuring the recent years, at the FLNR (JINR) a successful cycle of experiments has been accomplished on the synthesis of the superheavy elements with Z=112-118 with 48Ca beam. From the viewpoint of the detection of rare decays and background suppression, this success was achieved due to the application of a new radical technique – the method of active correlations. The method employs search in a real-time mode for a pointer to a probable correlation like recoil-alpha for switching the beam off. In the case of detection in the same detector strip an additional alpha-decay event, of “beam OFF” time interval is prolonged automatically. Reasonable scenarios of developing the method are considered. PC based data acquisition system as well as the monitoring and control system of the Dubna Gas Filled Recoil Separator is considered in brief too (see also my poster at the section PCM-4). • Content • Introduction • Synthesis of SHE at the Dubna Gas-filled Recoil Separator – detection system • Search for a short ER – alpha correlation in a real-time mode. Motivation, algorithm… • Examples – synthesis of 117 element • (experiment Dubna – Livermore - Oakridge 2009-2010 ) Installing of high radioactive actinide target to the DGFRS entrance

  2. the Dubna Gas Filled Recoil Separator

  3. Active correlation technique.Goal: to suppress beam associated backgrounds (radically!) The simple but new idea of the algorithm is aimed at searching in real-time mode of time-energy-position recoil(ER)-alpha links, using the discrete representation of the resistive layer of the position sensitive PIPS detector separately for signals like “recoil” and “alpha-particle”. So, the real PIPS detector is represented in the PC’s RAM in the form of two matrixes, one for “ER” and one for “alpha”. Those elements are filled by values of elapsed times of the given signals. The second index number of the matrix element is defined from the vertical position, whereas the first index is in fact strip number (1..12). In each case of “α” signal detection , a comparison with “ER” matrix is made, involving neighboring elements (usually +/- 3) .If the minimum time is less or equal to the setting time, the system turns on the beam chopper which deflects the heavy ion beam in the injection line of the cyclotron for a few minutes. The next step of the computer code ignores the vertical position of the forthcoming alpha-particle signal during the beam- off interval. If such decay takes place in the same strip that generated the pause, the duration of the beam-off interval is prolonged up to tens of minutes.

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