| Autor: |
T.J.M. Symons, Gregory Lane, I. Y. Lee, M. Cromaz, R. W. MacLeod |
| Rok vydání: |
2001 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 462:519-529 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/s0168-9002(00)01126-8 |
| Popis: |
Optimal sensitivity in large HPGe γ-ray spectrometers such as Gammasphere and Euroball is achieved with 4-fold γ-ray coincidences or higher. Analysis of coincidence data at these folds is difficult as storage constraints make histogram-based techniques impractical. To address the problem of efficient storage of and access to high-fold coincidence data we have developed Blue , a specialized database program. Each coincidence event in this database is stored in its native fold eliminating statistical artifacts which can be introduced by unfolding a high-fold event to several lower-fold events. Partition of the dataset is based on the density distribution of coincidence events which makes data access efficient. A simple yet flexible query system is implemented by using a tree-like index for these partitions. This program is capable of executing a variety of queries, such as taking gates on a multi-fold database, at timescales which are interactive (s) or near-interactive (min). Simple compression techniques are employed so that databases with sizes of 10 9 coincidences can easily be stored in a space of 10 Gb or less. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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