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Dear Yoshiyuki Fukuda,

The submission of your abstract has been successfully processed.

Abstract submitted: https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts.

Status of your abstract: https://indico.cern.ch/event/192695/call- for-abstracts/276/.

See below a detailed summary of your submitted abstract:

Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics

Submitted by: FUKUDA, Yoshiyuki

Submitted on: 26 February 2014 10:34

Title: Development of liquid scintillator containing zirconium complex for neutrinoless double beta decay experiment

Abstract content An organic liquid scintillator containing zirconium complex was studied for neutrinosless double beta decay experiment. A $^{96}$Zr nuclei has a large Q-value (3.35MeV), and no experiment is planned to use as a target. In order to realize ton scale target isotope with good energy resolution (4%@2.5MeV), we have used zirconium beta-diketon complex which has huge solubility (over 10w.t.%) to the Anisole. However, the absorption wavelength of diketon ligand overlaps with the luminescence from Anisole. Therefore, the light yield of liquid scintillator decreased in proportion to the concentration of beta-diketon complex. In order to avoid this problem, we synthesized beta-keto ester complex introducing -OC3H7 or -OC2H5 substituent groups in the beta-diketon complex. These complexes have shorter absorption wavelength (245nm) than the emission wavelength of Anisole (275nm). The scintillation light yield recoverd about double, however, did not reach at the expected value, because the residual absorption around the 275nm still exists. We found those were caused by the imprities of beta-keto ester complex and it will be solved by thr purifying the complex. Now we have also found that a diethyl malonate ligands shifted the absorption peak to around 210nm, and the complex will have no quenching for the Anisole based liquid scintillator. Here we will report the present status.

Summary

Primary Authors: Prof. FUKUDA, Yoshiyuki (Depertment of Physics, Miyagi University of Education) fukuda@staff.miyakyo-u.ac.jp

Co-authors: Prof. MORIYAMA, Shigetaka (Kamioka Observatory, ICRR, University of Tokyo) moriyama@icrr.u-tokyo.ac.jp Prof. OGAWA, Izumi (Faculty of Engineering, Fukui University) ogawa@u-fukui.ac.jp

Abstract presenters: Prof. FUKUDA, Yoshiyuki

Track classification: Experiments: 2c) Detectors for neutrino physics

Presentation type: Oral

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