Doping of a Borexino-like Liquid Scintillator with Tellurium-Diols
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arXiv
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2025
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| author | Steiger, Hans Th. J. Beretta, Marco Böhles, Manuel Garfagnini, Alberto Gavrikov, Arsenii Lombardi, Paolo Loo, Kai Pasini, Elena Rasera, Benedetta Serafini, Andrea Wurm, Michael |
| author_facet | Steiger, Hans Th. J. Beretta, Marco Böhles, Manuel Garfagnini, Alberto Gavrikov, Arsenii Lombardi, Paolo Loo, Kai Pasini, Elena Rasera, Benedetta Serafini, Andrea Wurm, Michael |
| contents | One promising approach for future neutrinoless double beta decay ($0νββ$) searches is the incorporation of candidate isotopes into liquid scintillator detectors. In this work, a sample of the high-performance 1,2,4-trimethylbenzene-based liquid scintillator used in the Borexino experiment was loaded with different concentrations of Te-diol compounds. To realize the loading, a modified water-free synthesis procedure in a non-acidic organic environment at room temperature was employed. The loaded scintillator mixtures were characterized with respect to their emission spectra, optical absorbance, light yield, and scintillation time profiles under $α$ excitation. Within the experimental uncertainties, only comparatively small changes in the spectral emission shape and optical transmission were observed for Te-loadings up to 2\%. At the same time, a systematic reduction of the scintillation light yield with increasing Te concentration was measured. At 1\% Te-loading, an estimated light yield of approximately 8400\,photons/MeV$_{\mathrm{ee}}$ was obtained. Furthermore, the scintillation time profile measurements indicate systematically shorter effective decay time constants for increasing Te-loading, consistent with enhanced non-radiative de-excitation processes introduced by the Te-diol complexes. Overall, the results demonstrate that the investigated loading technique can be successfully applied to a pseudocumene-based liquid scintillator while preserving the principal scintillation characteristics of the system. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_06665 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Doping of a Borexino-like Liquid Scintillator with Tellurium-Diols Steiger, Hans Th. J. Beretta, Marco Böhles, Manuel Garfagnini, Alberto Gavrikov, Arsenii Lombardi, Paolo Loo, Kai Pasini, Elena Rasera, Benedetta Serafini, Andrea Wurm, Michael Instrumentation and Detectors One promising approach for future neutrinoless double beta decay ($0νββ$) searches is the incorporation of candidate isotopes into liquid scintillator detectors. In this work, a sample of the high-performance 1,2,4-trimethylbenzene-based liquid scintillator used in the Borexino experiment was loaded with different concentrations of Te-diol compounds. To realize the loading, a modified water-free synthesis procedure in a non-acidic organic environment at room temperature was employed. The loaded scintillator mixtures were characterized with respect to their emission spectra, optical absorbance, light yield, and scintillation time profiles under $α$ excitation. Within the experimental uncertainties, only comparatively small changes in the spectral emission shape and optical transmission were observed for Te-loadings up to 2\%. At the same time, a systematic reduction of the scintillation light yield with increasing Te concentration was measured. At 1\% Te-loading, an estimated light yield of approximately 8400\,photons/MeV$_{\mathrm{ee}}$ was obtained. Furthermore, the scintillation time profile measurements indicate systematically shorter effective decay time constants for increasing Te-loading, consistent with enhanced non-radiative de-excitation processes introduced by the Te-diol complexes. Overall, the results demonstrate that the investigated loading technique can be successfully applied to a pseudocumene-based liquid scintillator while preserving the principal scintillation characteristics of the system. |
| title | Doping of a Borexino-like Liquid Scintillator with Tellurium-Diols |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2510.06665 |