Download presentation
Presentation is loading. Please wait.
Published byKory Rebecca Allison Modified over 8 years ago
1
Highlights of the TEXONO Research Program : Status and Plans Overview of TEXONO Collaboration Research Program Kuo-Sheng Reactor Neutrino Laboratory Results Highlights Future Plans & Directions Henry T. Wong / 王子敬 Academia Sinica / 中央研究院 @ Phoenix Park KIMS-TEXONO Joint Meeting
2
TEXONO Collaboration Collaboration : Taiwan (AS, INER, KSNPS, NTU,NCU,NCCU) China (IHEP, CIAE, THU, NJU, NKU) Turkey (METU) India (BHU) + Close Partnership (KIMS Collaboration in S. Korea) Taiwan EXperiment On NeutrinO
3
Poineering Efforts : “Zero-Background Experiment” ! KS Expt: 1 st large-scale particle physics experiment in Taiwan TEXONO Coll. : 1 st big research Coll. % Taiwan & China........ and now extending our presence to Korea, Turkey & India
4
Kuo-Sheng Nuclear Power Plant KS NPS-II : 2 cores 2.9 GW KS Lab: 28 m from core#1
5
Kuo Sheng Reactor Neutrino Laboratory Front Gate Configuration: Modest yet Unique Flexible Design: Allows different detectors conf. for different physics Inner Target Volume Front View (cosmic vetos, shieldings, control room …..)
6
R&D : Coh. ( N) T < 1 keV Results & More Data: ( e ) T ~ 1-100 keV On-Going Data Taking & Analysis SM ( e) T > 2 MeV Reactor Neutrino Interaction Cross-Sections massqualityDetector requirements
7
Kuo Sheng Reactor Neutrino Laboratory : First Results on Neutrino Magnetic Moments (LST)
8
Coverage in International Press
9
Search of at low energy high signal rate & robustness: >>SM [ decouple irreducible bkg unknown sources ] T << E d /dT depends on total flux but NOT spectral shape [ flux well known : ~6 fission- ~1.2 238 U capture- per fission ]
10
Another notable result – First exploration of electron- neutrino production at reactors ….
11
Electron Neutrinos @ Reactor (PRD 72, 2005) Nuclear material Fission products n rich nuclei Stable isotope Structure material n - decay - decay EC even-even Electron neutrino emission electron anti- neutrino emission Evaluate e flux at standard reactors Derive limits on and for e Explore e flux enhancement in loaded reactor (e.g. with Cr) Study Potential applications : e NCC cross-section measurements, 13 Pu-production monitoring
12
Other on-going research program at KS: Measurement of neutrino-electron scattering cross- sections (i.e. sin 2 W at MeV range) with CsI(Tl) crystals [MD] Search of reactor axions with HPGe Studies of neutrino induced nuclear transitions in 73 Ge* Background measurement, understanding and suppression at reactor lab. [MD] Future Goal at KS: First observation of neutrino-nucleus coherent scattering [LST] Explore new detector energy down to 100 eV testing “ULEGe” prototypes at AS+KS+Y2L Expect ready for a major experiment with ~1 kg scale detector at 2007
13
CsI(Tl) Array (~200 kg) : e) Z =40 cm Single Crystal Q L Vs Q R (Raw Data) Region of Interest for SM e) Z = 0 cm 208 Tl 40 K 137 Cs Data analysis under way……..
14
“Ultra-Low-Energy” HPGe Prototype ULEGe – developed for soft X-rays detection ; easy & inexpensive & robust operation Prototype : (I) 5 g ; (II) 4 X 5 g ; (III) 10 g ; (IV) segmented 20 g threshold <100 eV after modest PSD [lowest achieved for bulk radiation detectors] study feasibilities for 1-kg-ish detector for coherent scattering and Dark Matter searches [ search a by-product ] 5 g 4 X 5 g
15
ULE-HPGe Prototype Results ※ threshold ~100 eV, calibration by linear extrapolation from 1-6 keV ※ PSD possible to suppress noise edge Threshold ~ 100 eV
16
Reactor Axions Analysis with HPGe data Reactor core has intense M1 transitions : e.g. 7 Li, 91 Y, 97 Nb etc. Signature : peak at transition energy at HPGe due to Primakoff conversion Like TEXONO HPGe
17
Tagging of 73 Ge ½ - 2 transitions Event-by-Event background-free tag with PSD To do : Reactor ON/OFF analysis on the system ~1 s before/after the transition -induced events signature: excess in the “ON+before” spectra Looking for -induced 73 Ge *
18
Yangyang ( 襄陽 ) Lab (Y2L) min. 700 m of rock overburden Install 5 g ULB-ULEGe at Y2L on January 2005 Study background and feasibility for CDM searches may evolve into a full-scale (1 kg) CDM experiment TEXONO KIMS @ Y2L (LX)
19
Sensitivity Plot for CDM-WIMP search with 1 kg ULEGe at 100 eV threshold ………
20
Improved measurement of Quenching Factors in CsI(Tl) First direct verification of the optical model
21
40 MHz ; 12 bit ; 32 ch/module @ 9 U VME [ c/f KS FADC : 20 MHz ; 8 bit ; 16 ch/module ] On-board processing with FPGA 1000 channels used in TPC in LEPS Expt. @ SPring8 TPC for LEPS @ SPring8 40 MHz sampling rate. 10 bits resolution with 2Vp-p dynamic range. Clock distribution with Phase Lock Loop circuit. On Board digital signal delay and Real-Time ZERO-Suppression. High capacity First In First Out Memory. Easy to use with high density connector. Mixed signal FADC Adapter Board TEXONO/KS FADC for SPring8/LEPS (cosmic muon)
22
Trace Radio-purity with AMS (CIAE) Based at AMS facilities @CIAE with 13 MV Tandem Potential Merits: small samples, quick versatile on sample choice sensitive to emitters sensitive to stable isotope & extrapolate (e.g. 39 K) >10 3 improvements over ICP-MS [.. once prescriptions are known. ] Status : demonstrate 129 I/ 127 I < 10 -12 g/g [NIM-B, 2006] measure 40 K~10 -10 g/g in CsI (powder) develop techniques for K in liquid scintillator Sensitivity goal : < 10 -16 g/g Future : 87 Rb …… [ 238 U / 232 Th series after Tandem upgrade]
24
Sonoluminescence Project (AS,NCU,CIAE) SonoLum Pulse a frontier subject with possible surprises new directions : to explore subjects we do not know inter-disciplinary research new research style and experience enriching Table-top experiments, pursue-able in several labs balance the other big & long time-scale projects use HEP approaches Focus : understand physics mechanism emissions of high energy radiations Achieved : devise method for UV detection [Ultrasonics, 2006]
25
TEXONO Collaboration: Built-Up from Scratch & Maturing Kuo-Sheng Neutrino Lab.: Established & Operational Modular & Flexible Design Physics Data Taking since June 01 ※ Unique HPGe Low Energy Data ※ Bkg Level ~ Underground CDM Expt Results published on & reactor e Summary & Outlook
26
Diversified Program in Parallel Main Thrust on ~200 kg CsI(Tl) [ ( e) …] ULEGe: for coh ( N) + CDM Present Focus of Collaborating Groups: AS :: -e S. Coherent S. SonoLum. CIAE :: AMS SonoLum. THU :: CDM Search Reaching Out Y2L @ Korea / Daya Bay Project (?) / Regional Framework TEXONO is a (modest) part of world neutrino physics community Tremendous Pleasure & Pressure !
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.