暗物質(zhì)地下探測(cè)的前沿技術(shù)預(yù)研2013年年度報(bào)告

楊長(zhǎng)根 關(guān)夢(mèng)云 王志民 鐘瑋麗 馬欣華

摘 要：“暗物質(zhì)地下探測(cè)的前沿技術(shù)預(yù)研”主要研究?jī)?nèi)容是綜合前一階段惰性液體探測(cè)器方案、晶體探測(cè)器方案、過(guò)熱液滴探測(cè)器方案均基本按計(jì)劃進(jìn)行：惰性液體探測(cè)器方面，實(shí)現(xiàn)液氬模型探測(cè)器系統(tǒng)的搭建，實(shí)現(xiàn)低溫系統(tǒng)、氬氣液化、模型探測(cè)器系統(tǒng)密封與檢測(cè)、TPB波長(zhǎng)位移板鍍膜、高純氬氣純化、單相液氬發(fā)光并探測(cè)，為下一步研究、發(fā)展液氬探測(cè)技術(shù)，研究相關(guān)探測(cè)器參數(shù)，實(shí)現(xiàn)液氬探測(cè)器在錦屏進(jìn)行地下暗物質(zhì)的探測(cè)打下了基礎(chǔ)；并將進(jìn)一步研究單相液氬探測(cè)器的相關(guān)參數(shù)，研究?jī)上嗵綔y(cè)方案；晶體探測(cè)器已利用北京大學(xué)中子束流的進(jìn)行了n/gamma的相關(guān)測(cè)試，測(cè)試結(jié)果表明探測(cè)系統(tǒng)、方法工作正常，本底可控，并可以進(jìn)一步預(yù)期使用原子能院更高（3～4個(gè)量級(jí)）強(qiáng)度束流測(cè)試將可達(dá)到比較好的測(cè)試結(jié)果，并實(shí)現(xiàn)對(duì)晶體n/gamma鑒別能力的定量測(cè)量，以確定晶體探測(cè)器方案的本底；同時(shí)我們將進(jìn)行18 kg晶體模型探測(cè)器的最后組裝及測(cè)試工作，研究探測(cè)器耦合介質(zhì)、探測(cè)器響應(yīng)、本底水平等；晶體探測(cè)技術(shù)成熟，大質(zhì)量的晶體探測(cè)器在暗物質(zhì)探測(cè)的截面測(cè)量方面仍有一定的優(yōu)勢(shì)，特別是在質(zhì)子自旋相關(guān)的暗物質(zhì)探測(cè)方面有顯著的優(yōu)勢(shì)；過(guò)熱液滴的氣泡探測(cè)技術(shù)仍然在不斷地進(jìn)步中，截止目前，該課題組已發(fā)展并使用放射源測(cè)量了過(guò)熱液滴探測(cè)器，實(shí)現(xiàn)了探測(cè)器對(duì)中子的靈敏響應(yīng)、對(duì)gamma的惰性響應(yīng)；研究了氣泡探測(cè)器聲音信號(hào)的頻譜特征，設(shè)計(jì)并初步開(kāi)發(fā)了信號(hào)的聲頻識(shí)別系統(tǒng)。我們將繼續(xù)跟蹤國(guó)際最新動(dòng)向，發(fā)展相關(guān)探測(cè)、識(shí)別技術(shù)。

關(guān)鍵詞：暗物質(zhì) 暗物質(zhì)探測(cè) 液氬探測(cè)器 晶體探測(cè)器 過(guò)熱液滴探測(cè)器 探測(cè)器模型

Annual Report 2013 of Advanced Study for Frontier Technologies of Underground Dark Matter Detection

Yang Changgen Guan Mengyun Wang Zhimin Zhong Weili Ma Xinhua

（Institute of High Energy Physics， Chinese Academy of Sciences）

Abstract：The topic of advanced study for frontier technologies of underground dark matter detection is aimed to comprehensive analysis of current world detectors/technologies to study and make high sensitive and low background deep underground detectors preparing for direct detection of dark matter in Galaxy， to design special detecting system for different dark matter models. Here we intend to study the options with mature liquid argon/Xenon and crystals technologies with international cooperation， and further to study new detecting technologies. All the three detector options are going on plan in last stage： liquid argon， crystal and superheated liquid： Firstly， for the liquid argon detecting option， we are contributing to the Dark Side collaboration and improving ourselves at the same time. We are building our own liquid argon detector at IHEP to study its performance， and we already have made some achievements： the prototype detector is built， get liquid argon from gas， leakage test of the system with He and RGA， coating TPB to a Teflon plate， purification of argon gas， scintillation and detection light of liquid argon； all of these are very helpful for further study and development of liquid argon detector， next two phase stage， and even for the dark matter detection in Jinping underground laboratory. We have do the 1st stage test for the n/gamma discrimination of crystal with Peking university neutron beam， which has confirmed that the system is working well， and we can expect good results for the measurement with CIAE neutron beam which has about 3～4 magnitude higher intensity； and we will run a 18 kg crystal prototype soon at IHEP to study the coupling quantity among crystals/PMT， the background and the performance of the system. Crystal is a mature technology which can be easily used with high quality in dark matter measurements， especially in the proton spin mode which has a significant advantage. Superheated droplets bubble detection technology is still in progress ， until now， our group has measured the detector with radioactive sources and achieved a good sensitivity to neutron not gamma； studied the spectral characteristics of the sound signal of the detector， designed and realized an audio recognition system. We will continue to follow the latest international trends， and develop further technologies.

Key Words：Dark matter； Detection of dark matter； Liquid argon detector； Crystal detector； Superheated liquid detector； Detector prototype

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