Narrow Results

The Antarctic Muon And Neutrino Detector Array (AMANDA) has been taking data since 2000 and its data acquisition system was upgraded in January 2003 to read out the complete digitized waveforms from the buried Photomultipliers (PMTs) using Transient Waveform Recorders (TWR). This system currently runs in parallel with the standard AMANDA data acquisition system. Once AMANDA is incorporated into the 1 km³ detector IceCube, only the TWR system will be kept. We report results from a first atmospheric neutrino analysis on data collected in 2003 with TWR. Good agreement in event rate and angular distribution verify the performance of the TWR system. A search of the northern hemisphere for localized event clusters shows no statistically significant excess, thus a flux limit is calculated, which is in full agreement with previous results based on the standard AMANDA data acquisition system. We also update the status of a search for diffusely distributed neutrinos with ultra high energy (UHE) using data collected by the TWR system.

We present recent results from the Antarctic Muon And Neutrino Detector Array (AMANDA), located at the South Pole in Antarctica. AMANDA-II, commissioned in 2000, is a multipurpose high energy neutrino telescope with a broad physics and astrophysics scope. We summarize the results from searches for a variety of sources of ultra-high energy neutrinos: TeV-PeV diffuse sources by measuring either muon tracks or cascades, neutrinos in excess of PeV by searching for muons traveling in the down-going direction and point sources.

The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment. The primary goal of JUNO is to determine the neutrino mass hierarchy and measure the oscillation parameters in high precision by reactor anti-neutrinos. The JUNO detector is currently under R&D, which is defined as central detector, liquid scintillator (LS), PMT system, VETO detector, and calibration system. The central detector will build a large acrylic sphere of 35.4 m in diameter to contain the 20-kton LS, and the acrylic sphere is supported by a stainless-steel truss. Design and bidding of the acrylic sphere has been finished. The pilot plant of the LS has been constructed. The PMT system includes 20000 20-inch PMTs and 25000 3-inch PMTs. Mass production of the 20-inch PMTs has started with a few thousands of PMTs have been delivered. PMT testing and instrumentation is ongoing. The VETO detector is divided into a top tracker and a water Cherenkov detector. Calibration system with four complementary methods is considered. In this proceeding, the status of the JUNO detector will be addressed.

The Antarctic Muon And Neutrino Detector Array (AMANDA) has been taking data since 2000 and its data acquisition system was upgraded in January 2003 to read out the complete digitized waveforms from the buried Photo-multipliers (PMTs) using Transient Waveform Recorders (TWR). This system currently runs in parallel with the standard AMANDA data acquisition system. Once AMANDA is incorporated into the 1 km³ detector IceCube, only the TWR system will be kept. We report results from a first atmospheric neutrino analysis on data collected in 2003 with TWR. Good agreement in event rate and angular distribution verify the performance of the TWR system. A search of the northern hemisphere for localized event clusters shows no statistically significant excess, thus a flux limit is calculated, which is in full agreement with previous results based on the standard AMANDA data acquisition system. We also update the status of a search for diffusely distributed neutrinos with ultra high energy (UHE) using data collected by the TWR system.