立方体的特征

论文标题

立方体的特征

Characterization of cubic Li$_{2}$$^{100}$MoO$_4$ crystals for the CUPID experiment

论文作者

Armatol, A., Armengaud, E., Armstrong, W., Augier, C., Avignone III, F. T., Azzolini, O., Barabash, A., Bari, G., Barresi, A., Baudin, D., Bellini, F., Benato, G., Beretta, M., Bergè, L., Biassoni, M., Billard, J., Boldrini, V., Branca, A., Brofferio, C., Bucci, C., Camilleri, J., Capelli, S., Cappelli, L., Cardani, L., Carniti, P., Casali, N., Cazes, A., Celi, E., Chang, C., Chapellier, M., Charrier, A., Chiesa, D., Clemenza, M., Colantoni, I., Collamati, F., Copello, S., Cova, F., Cremonesi, O., Creswick, R. J., Cruciani, A., D'Addabbo, A., D'Imperio, G., Dafinei, I., Danevich, F. A., de Combarieu, M., De Jesus, M., de Marcillac, P., Dell'Oro, S., Di Domizio, S., Dompé, V., Drobizhev, A., Dumoulin, L., Fantini, G., Fasoli, M., Faverzani, M., Ferri, E., Ferri, F., Ferroni, F., Figueroa-Feliciano, E., Formaggio, J., Franceschi, A., Fu, C., Fu, S., Fujikawa, B. K., Gascon, J., Giachero, A., Gironi, L., Giuliani, A., Gorla, P., Gotti, C., Gras, P., Gros, M., Gutierrez, T. D., Han, K., Hansen, E. V., Heeger, K. M., Helis, D. L., Huang, H. Z., Huang, R. G., Imbert, L., Johnston, J., Juillard, A., Karapetrov, G., Keppel, G., Khalife, H., Kobychev, V. V., Kolomensky, Yu. G., Konovalov, S., Liu, Y., Loaiza, P., Ma, L., Madhukuttan, M., Mancarella, F., Mariam, R., Marini, L., Marnieros, S., Martinez, M., Maruyama, R. H., Mauri, B., Mayer, D., Mei, Y., Milana, S., Misiak, D., Napolitano, T., Nastasi, M., Navick, X. F., Nikkel, J., Nipoti, R., Nisi, S., Nones, C., Norman, E. B., Novosad, V., Nutini, I., O'Donnell, T., Olivieri, E., Oriol, C., Ouellet, J. L., Pagan, S., Pagliarone, C., Pagnanini, L., Pari, P., Pattavina, L., Paul, B., Pavan, M., Peng, H., Pessina, G., Pettinacci, V., Pira, C., Pirro, S., Poda, D. V., Polakovic, T., Polischuk, O. G., Pozzi, S., Previtali, E., Puiu, A., Ressa, A., Rizzoli, R., Rosenfeld, C., Rusconi, C., Sanglard, V., Scarpaci, J. A., Schmidt, B., Sharma, V., Shlegel, V., Singh, V., Sisti, M., Speller, D., Surukuchi, P. T., Taffarello, L., Tellier, O., Tomei, C., Tretyak, V. I., Tsymbaliuk, A., Vedda, A., Velazquez, M., Vetter, K. J., Wagaarachchi, S. L., Wang, G., Wang, L., Welliver, B., Wilson, J., Wilson, K., Winslow, L. A., Xue, M., Yan, L., Yang, J., Yefremenko, V., Yumatov, V., Zarytskyy, M. M., Zhang, J., Zolotarova, A., Zucchelli, S.

论文摘要

丘比特协作正在设计一个吨级，无背景的检测器，以搜索具有足够灵敏度的双β衰减，以充分探索与倒立的中微子质量层次结构方案相对应的参数空间。丘比特示威者之一Cupid-Mo已证明了丰富的Li $ _ {2} $$^{100} $ Moo $ _4 $ Crystals的潜力，作为中微子双β衰变搜索的合适探测器。在这项工作中，我们表征了立方晶体，与丘比特摩托的圆柱形晶体相比，这些晶体对于构造紧密堆积阵列的构造更具吸引力。我们在感兴趣的地区的平均能量分辨率为（6.7 $ \ pm $ 0.6）kev fwhm，接近5 keV FWHM的丘比特目标。我们评估了有或没有反射箔的$α$颗粒的识别，从而提高了闪烁的光收集效率，证明了丘比特的基线设计已经确保完全抑制这种$α$诱导的背景贡献。我们还使用收集的数据来验证模拟光收集效率的蒙特卡洛模拟，这将使检测器进行进一步的优化。

The CUPID Collaboration is designing a tonne-scale, background-free detector to search for double beta decay with sufficient sensitivity to fully explore the parameter space corresponding to the inverted neutrino mass hierarchy scenario. One of the CUPID demonstrators, CUPID-Mo, has proved the potential of enriched Li$_{2}$$^{100}$MoO$_4$ crystals as suitable detectors for neutrinoless double beta decay search. In this work, we characterised cubic crystals that, compared to the cylindrical crystals used by CUPID-Mo, are more appealing for the construction of tightly packed arrays. We measured an average energy resolution of (6.7$\pm$0.6) keV FWHM in the region of interest, approaching the CUPID target of 5 keV FWHM. We assessed the identification of $α$ particles with and without a reflecting foil that enhances the scintillation light collection efficiency, proving that the baseline design of CUPID already ensures a complete suppression of this $α$-induced background contribution. We also used the collected data to validate a Monte Carlo simulation modelling the light collection efficiency, which will enable further optimisations of the detector.

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