389 research outputs found
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
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
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
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
REDSTORM C++ Builder code for a new DGFRS detection system
REal-time Detection and STORage of Multy-chain events Builder C++ code has
been designed to operate together with the new DGFRS detection system in FLNR,
JINR. It allows to provide event by event storage and real-time search for
ER-alpha sequences both for 32 strip position sensitive PIPS detector (CANBERRA
NV) or 48x128 strip DSSSD detector (Micron Semiconductors). In the last case it
operates in parallel with the ORNL digital system. Namely with this code (PIPS
detector branch) it has become possible to detect 13 decay chains of Z=117
nuclei in the reaction 249Bk+48Ca-> 117+3,4n.Comment: NEC 201
Three sources and three components of success in detection of ultra-rare alpha decays at the Dubna Gas-Filled Recoil separator
General philosophy of procedure of detecting rare events in the recent
experiments with 48Ca projectile at the Dubna Gas-Filled Recoil
Separator(DGFRS) aimed to the synthesis of superheavy elements (SHE) has been
reviewed. Specific instruments and methods are under consideration. Some
historical sources of the successful experiments for Z=112-118 are considered
too. Special attention is paid to application of method of active correlations
in heavy-ion induced complete fusion nuclear reactions. Example of application
in Z=115 experiment is presented. Brief description of the 243Am + 48Ca ->
291-x115+xn experiment is presented too. Some attention is paid to the role of
chemical experiments in discoveries of SHEs. The DGFRS detection/monitoring
system is presented in full firstly
C++ Builder 6.0 CEDV code for files processing
A RAD C++ Builder's 6.0 code CEDV under Windows XP has been designed for
visualizing data obtained from heavy-ion-induced complete fusion reactions at
the main U-400 cyclotron of FLNR. The main purpose of the code is processing
the data from the experiments aimed to at studying chemical properties of SHE.
Data from the Dubna Gas -Filled Recoil Separator could be processed too. Some
subroutines for estimating statistical parameter are also presented ; these are
based on modified BSC (background signal combination) approaches
Method of active correlations for DSSSD detector application
Real-time PC based algorithm is developed for DSSSD ( Double Side Silicon
Strip Detector) detector. Brief description of the detection system is also
presented. Complete fusion nuclear reaction natYb+48Ca->217Th is used to test
this algorithm at 48Ca beam. Example of successful application of a former
algorithm for resistive strip PIPS detector is presented too.Comment: EVR-alpha correlation sequence real-time search. PACS:07.05.Wr, Dubna
201
Parameter monitoring system of the Dubna Gas-Filled Recoil Separator
PC-based one-crate monitoring and control system of the Dubna Gas Filled
Recoil Separator (DGFRS) is considered. It is developed for the long-term
experiments at the U400 FLNR cyclotron and is aimed at the synthesis of super
heavy nuclei in heavy ion induced complete fusion reactions. Parameters related
to:
a) beam and cyclotron;
b) separator by itself,
c) detection system,
d) target and entrance window are measured and stored in the protocol file of
the experiment. Special attention is paid to generating the alarm signals and
implementing further the appropriate proceduresComment: parameter monitoring C++ cod
- …