Reaction natYb+48Ca->217Th+3n: auto calibration process for DSSSD detector application (particular case)

The Dubna Gas-Filled Recoil Separator (DGFRS) is the mostly effective setup in use for the field of synthesis of superheavy elements. Application of DSSSD detector provides more precise energy and position detection for both implanted recoils and their alpha decays. To minimize contribution of background products the method of fctive correlation is applied at the DGFRS. To apply this method a precise calibration for 48 front strips is strongly required. Method of three peaks auto calibration is proposed with a first approximation step with 9.26 MeV 217Th peaks. Examples of alpha-decay original spectra and spectra after filtration procedures are presented.Comment: The DGFRS long-term experiment

Space-time holomorphic solutions of Navier-Stokes equations

We introduce a concept of space-time holomorphic solutions of partial differential equations and construct a meromorphic solution of Navier-Stokes equations

Active Correlation Technique: Status and Development

During the recent years, at the FLNR a successful cycle of experiments has been accomplished on the synthesis of the superheavy elements with Z=112 to Z=118 using 48Ca ion 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 automaticall

Physical basis of critical analysis

A new approach to provide a fruitful analysis of signal amplitude is proposed. It is this method that has made it possible to eliminate some observed artificial events from the list of candidates for decays of superheavy nuclei. Examples of estimates of measured amplitudes of evaporation residues (EVR) are presented. Some attention is paid to a new hard statistical criterion for detecting rare events. This criterion can be applied in the case of significant role of random factors

Active correlations technique: Schmidt equation with partially free order

LDSC (Linked decay signal combination) is modified taking into account application of active correlation technique to suppress beam associated backgrounds. Examples of application are presented

A new reasonable scenario to search for ER-alpha energy-time-position correlated sequences in a real time mode

A new real-time PC based algorithm and a compact C++ code to operate in a real-time mode with a 48x128 strip double side position sensitive large area silicon radiation detector Micron Semiconductors (UK) are developed and tested. Namely with this new approach it has become possible to provide the quick extraction of EVR-alpha correlated sequences in heavy ion induced complete fusion nuclear reactions. Specific attention is paid to the application of new CAMAC 4 M modules for charge particle position measurement during long- term experiments aimed to the synthesis of new superheavy nuclei. Some attention is paid to the different (combined) algorithm scenario to search for ER-alpha and alpha-alpha chains.Comment: Method for radical background suppressio

Development of Active Correlation Technique

With reaching to extremely high intensities of heavy-ion beams new requirements for the detection system of the Dubna Gas-Filled Recoil Separator (DGFRS) will definitely be set. One of the challenges is how to apply the active correlations method to suppress beam associated background products without significant losses in the whole long-term experiment efficiency value. Different scenarios and equations to develop the method according this requirement are under consideration in the present paper. The execution time to estimate the dead time parameter associated with the optimal choice of the life-time parameter is presented.Comment: in print for Lett. to ECHAYA 201

Complex signal amplitude analysis for complete fusion nuclear reaction products

A complex analysis has been performed on the energy amplitude signals corresponding to events of Z=117 element measured in the 249Bk+48Ca complete fusion nuclear reaction. These signals were detected with PIPS position sensitive detector. The significant values of pulse height defect both for recoils (ER) and fission fragments (FF) were measured. Comparison with the computer simulations and empirical formulae has been performed both for ER and FF signals.Comment: Implanted nuclei deca

On the common solution within a framework of single matrix algorithm for radical suppression of background products in heavy-ion induced reaction

Application of real-time matrix algorithm in heavy ion induced complete fusion nuclear reactions of superheavy elements synthesis is reviewed in brief. An extended algorithm, for the case of the recoil detection efficiency is not close to 100% has been proposed.Comment: EVR-alpha or/and alpha-alpha correlations searc

Recoil filters for active correlations method: different scenarios

New approach to the life time estimation for recoil alpha detected times is presented. Brief description of the Dubna Gas Filled Recoil Separator detection module is presented too. This approach will be used for real time detecting ctive correlationsmethod with nearest future commissioning of new FLNR DC280 extremely high intense heavy ion cyclotron in the year 2017.Comment: Utra high heaavy ion beam intensity cyclotron. Application of active correlations metho