Data Management Plan

Data Types and Sources

SK detector raw data is comprised of binary information that is readable by SK proprietary code which relies on data bases to properly identify active channels, apply calibration constants, and further organize the information for analysis. Event data is largely background from cosmic rays and radioactive decays, and must be processed by reduction software to select events of interest. Events of interest are then processed further by detailed reconstruction algorithms that identify the characteristics of the events. Equally as important as detector data are large Monte Carlo simulations of various processes that may be observed in the detector data. Likewise, dedicated calibration data are used to understand the performance of the detector.

Reconstructed events are used to perform physics analyses such as neutrino observations and the search for proton decay. The results of these analyses are published in peer-reviewed journals.

Content and Format

The format of the event raw data as well as the reduced and reconstructed data are binary files that require proprietary code the fully access and interpret. Subsequent analysis uses summary information stored in the CERN ROOT or ntuple format. The data analysis code is preserved using a versioning and archiving system, currently SVN.

Preservation and Sharing

The SK experiment has undergone several phases (SK-I, II, III, and IV), and has collected data since 1996. The SK collaboration treats the collected data carefully and has preserved the raw data on tape backup since the beginning of the SK experiment. The SK collaboration routinely performs new analyses and searches through the entire 20 year data set, generally starting with reduced and reconstructed files that are kept on redundant disk systems.

Due to the complexity of event level data, general public access is not practical. Data tables, content of figures, chi-squared maps, and other information that facilitates sharing with non-SK researchers are made available on the SK’s public web page, when papers are published.


SK data do not contain personal or confidential information and do not require special security measures.


This data management plan is in line with current practices of large particle physics experiments.