Neutrino Physics: Borexino & LENS

中微子物理学：Borexino

• 批准号: 0501118
• 负责人: ROBERT VOGELAAR
• 金额: $ 99万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0501118&HistoricalAwards=false
• 关键词: Neutrino; Physics; Borexino; & LENS

The Borexino experiment is designed to measure the Be-7neutrino flux from the Sun in real-time. The signal is generatedby neutrino-electron scattering in a scintillator. Since the Be-7neutrino is mono-energetic, the signature in our resulting spectra will bea 'Compton-like' edge, with few other distinguishing characteristics.The detector has the ability to separate alpha- from beta-events, however, andthere is also the potential to observe a solar 'signature' due to theannual variation of the neutrino rate arising from the changingEarth-Sun distance. Thus, energy, particle ID, and fiducial volumecalibration are all of paramount importance. Measuring the Be-7 neutrino flux (to ~5%) is critical toestablishing that the MSW mechanism is indeed the operating physicsbehind the solution of the 'solar neutrino problem' as implied bymeasurements at higher neutrino energies (such as SNO and SuperK). This grant will enable the calibration of the Borexinodetector using internal (and external) radioactive sources which can beaccurately located within the detector. It will also allow foran analysis effort at Virginia Tech to help extract meaningfulresults from a background dominated experiment (the purities inthe scintillator required are extraordinary: in the range of10^-17 to 10^-15 g(U/Th)/g(scint). While the principle goal is to measure the Be-7 solarneutrino flux, if the purity is sufficient, there may beopportunity to detect the pep neutrinos as well. This wouldbe equivalent to measuring the pp-neutrino flux from the Sun(and thus the Solar 'neutrino' luminosity). This would providean excellent overall check of our neutrino and SSM knowledge. The group working under this grant is also pursuing othermeans of measuring the pp flux, and the expertise/techniquesbeing developed to calibrate Borexino may eventually proveuseful in this endeavor as well.-- R. Bruce Vogelaar http://www.phys.vt.edu/~vogelaarPhysics Department (0435) mailto:[e-mail] TechBlacksburg, VA 24061(540) 231-8735 office(540) 231-7511 fax[phone] cell(540) 951-4875 home

Borexino实验旨在实时测量太阳的BE-7NEUTIRINO通量。 该信号是由中微子电子散射在闪烁体中产生的。 由于Be-7neutrino具有单一能源性，因此我们由此产生的光谱中的签名将比“ compton”的边缘更加“ compton”，而具有其他区别特征。探测器具有将alpha-事件与β事件分开的能力，但是，由于观察到一个正差异的距离，因此也有可能观察到一个距离变化的距离，从而使中心差的距离变化。 因此，能量，粒子ID和基准体积校准都是至关重要的。测量BE-7中微子通量（至〜5％）是至关重要的，因为MSW机制确实是在较高中微子能量（例如SNO和SUPERK）上暗示的“太阳中微子问题”的操作物理学的解决方案。该赠款将使用内部（和外部）放射性源对孔的校准进行校准，该源可以在检测器内贴上速度。 It will also allow foran analysis effort at Virginia Tech to help extract meaningfulresults from a background dominated experiment (the purities inthe scintillator required are extraordinary: in the range of10^-17 to 10^-15 g(U/Th)/g(scint). While the principle goal is to measure the Be-7 solarneutrino flux, if the purity is sufficient, there may beopportunity to detect the pep neutrinos as好吧。布鲁斯·沃格拉尔（Bruce Vogelaar）http://www.phys.vt.edu/~vogelaarphysics部门（0435）邮件： 951-4875房屋