[理學]中微子振蕩—大亞灣實驗及其未來發(fā)展(存儲版)
【正文】 液閃廳及混制設備 液閃的壽命與穩(wěn)定性是最大的技術挑戰(zhàn) 完成了設備工藝實驗 液閃壽命經過了長期考驗 PMT readout and trigger PMT readout Fanout Trigger board Prototype system test FADC ?清華大學負責的觸發(fā)板，已與前端電子學完成了聯(lián)調 ?最近在大亞灣現(xiàn)場完成了 Mini Dry Run，成功實現(xiàn)了探測器 前端電子學觸發(fā) 數(shù)據(jù)獲取 數(shù)據(jù)因特網傳輸 離線分析的全流程 North America (14) BNL, Caltech, Gee Mason Univ., LBNL, Iowa state Univ. Illinois Inst. Tech., Princeton, RPI, UCBerkeley, UCLA, Univ. of Houston, Univ. of Wisconsin, Virginia Tech., Univ. of IllinoisUrbanaChampaign, Asia (15) IHEP, Beijing Normal Univ., Chengdu Univ. of Sci. and Tech., CGNPG, CIAE, Dongguan Polytech. Univ., Nanjing Univ.,Nankai Univ., Shenzhen Univ., Tsinghua Univ., USTC, Zhongshan Univ., Hong Kong Univ. Chinese Hong Kong Univ., Taiwan Univ., Chiao Tung Univ., National United Univ. Europe (3) JINR, Dubna, Russia Kurchatov Institute, Russia Charles University, Czech Republic Daya Bay collaboration ~ 200 collaborators What we can do after Daya Bay ? 下一代中微子實驗：大亞灣二期 ? 中微子振蕩三個未解決的問題： 尋找第三種振蕩，用 q13表示 ? 大亞灣中微子實驗 質量順序問題 ?大亞灣中微子實驗二期 CP對稱破缺角 ? 未來的加速器實驗 ?1 ?2 ?3 q12太陽中微子振蕩 q23大氣中微子振蕩 q13 ? mi ? 為什么反應堆中微子： 1）加速器中微子實驗：造價昂貴 （探測器 +加速器） 2）雙 β實驗：造價昂貴，技術困難，科學風險大 3）中微子絕對質量測量：造價昂貴，技術困難 4）反應堆中微子實驗：意義重大、風險小、條件優(yōu)越、造價低、技術可行 ?測量磁矩：可能的未來，科學風險大 ?精確測量混合參數(shù)：大亞灣、大亞灣二期 Neutrino Mass hierarchy ? Mass Hierarchy: ? Fundamental to the Standard Model ? Fundamental to models beyond SM ? Most GUTs predict a normal mass hierarchy ? a discriminator of different GUTs and/or neutrino mass models ? Fundamental to many issues: – Matterantimatter asymmetry via leptogenesis in specific seesaw models: hierarchy related – Supernova neutrinos: collective flavor transitions due to inverted mass hierarchy – Radiative corrections to m? and qij are more sensitive to the inverted hierarchy But even more important… Dirac or Majorana ? ? Neutrino oscillation: beyond SM in a way of Dirac or Majorana mode ? ? ?? exp. may never give positive results ? If mass hierarchy is known, together with next generation ?? exp., the neutrino Dirac or Majorana nature can be determined. next gen. ?? exp. Measuring mass hierarchy ? Long baseline accelerator neutrinos – Through Matter effects – Expensive, projectX/LBNE in Fermilab/BNL ? Atmospheric neutrinos – Very weak signal – Huge detector, Expensive ? Reactor neutrinos – Method: distortion of energy spectrum – Enhance signature: Transform reactor neutrino L/E spectrum to frequency regime using Fourier formalism ? need Sin2(2q13) ? Need to know DM223 . Petcov et al., PLB533(2022)94 et al., PRD68(2022)113006 J. Learned, PRD 78(2022)071302 42 Fourier transformation of L/E spectrum ? Frequency regime is in fact the DM2 regime ? enhance the visible features in DM2 regime ? Take DM2 32 as reference – NH: DM2 31 DM2 32 , DM2 31 peak at the right of DM2 32 – IH: DM2 31 DM2 32 , DM2 31 peak at the left of DM2 32 L/E spectrum Our efforts ? Clear distinctive features: – FCT: ? NH: peak before valley ? IH: valley before peak – FST: ? NH: prominent peak ? IH: prominent valley ? Better than power spectrum
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