2016 Fiscal Year Annual Research Report
Study of giant resonances in neutron drip line nuclei - Related detector development for real-time particle identification
| Project/Area Number |
16H06716
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Stuhl Laszlo 東京大学, 大学院理学系研究科(理学部), 特任研究員 (20785232)
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| Project Period (FY) |
2016-08-26 – 2018-03-31
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| Keywords | neutron detector / PANDORA / particle identification / neutron discrimination / online pulse processing / digital read out |
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| Outline of Annual Research Achievements |
The (p,n) charge-exchange reactions at intermediate energies are a powerful tool to study the spin-isospin excitations of nuclei. The technique of inverse kinematics enables the (p,n) reactions on exotic nuclei with a high luminosity to be studied, but suffers from the large gamma-ray background. A clear tagging of low-energy recoil neutrons in realtime (prior to recording the event data by online neutron and gamma discrimination) may solve this problem. I developed a device based on novel plastic scintillators coupled to digital readout which is sensitive to the differences of the signals created by different particles. The design and the first prototypes of the PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) system was constructed and tested. The parameter of particle identification method were optimized based on online test with neutron sources. The onboard programming of CAEN v1730 digitizer module.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The design and development of PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) new system was finished, the tests for different pulse shape discrimination parameters were successfully optimized based on online test with neutron sources. Good separation of events originated from neutrons and gammas were confirmed using offline time-of-flight comparison.
First draft of a summary paper is created.
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| Strategy for Future Research Activity |
In FY2017 I plan to further optimize the performance of the prototypes of PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) particle and position sensitive low-energy neutron detector system: testing the effect of different wrapping materials on light collection and pulse shape discrimination capability of the EJ-299-34 plastic bars. The uniformity of particle identification along the detector bar will also be investigated. I plan to construct 8 additional, new PANDORA bars, expand our digital data acquisition system (DDAQ) using two different digitizer modules (V1730D and V1730B). The detection efficiency, separation efficiency, light attenuation, time and position resolution of the new device will be measured and some cases optimized. I will introduce in our DDAQ and data decoder the option to analyze the data using the fine time stamp provided by CAEN's DPP-PSD firmware on V1730 modules. Furthermore, I plan to investigate the opportunity to introduce an average pulse shape discrimination parameter to be used in online discrimination for double sided readout in PANDORA.
I plan to finish the publishing process of our new publication about PANDORA in Nuclear Instruments and Methods in Physics Research Section A journal.
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