相关论文: The MicroBooNE continuous readout stream for detec…

The Continuous Readout Stream of the MicroBooNE Liquid Argon Time Projection Chamber for Detection of Supernova Burst Neutrinos

The MicroBooNE continuous readout stream is a parallel readout of the MicroBooNE liquid argon time projection chamber (LArTPC) which enables detection of non-beam events such as those from a supernova neutrino burst. The low energies of the…

仪器与探测器 · 物理学 2021-02-12 MicroBooNE collaboration , P. Abratenko , M. Alrashed , R. An , J. Anthony , J. Asaadi , A. Ashkenazi , S. Balasubramanian , B. Baller , C. Barnes , G. Barr , V. Basque , L. Bathe-Peters , O. Benevides Rodrigues , S. Berkman , A. Bhanderi , A. Bhat , M. Bishai , A. Blake , T. Bolton , L. Camilleri , D. Caratelli , I. Caro Terrazas , R. Castillo Fernandez , F. Cavanna , G. Cerati , Y. Chen , E. Church , D. Cianci , E. O. Cohen , J. M. Conrad , M. Convery , L. Cooper-Troendle , J. I. Crespo-Anadon , M. Del Tutto , D. Devitt , R. Diurba , L. Domine , R. Dorrill , K. Duffy , S. Dytman , B. Eberly , A. Ereditato , L. Escudero Sanchez , J. J. Evans , A. A. Fadeeva , G. A. Fiorentini Aguirre , R. S. Fitzpatrick , B. T. Fleming , N. Foppiani , D. Franco , A. P. Furmanski , D. Garcia-Gamez , S. Gardiner , S. Gollapinni , O. Goodwin , E. Gramellini , P. Green , H. Greenlee , L. Gu , W. Gu , R. Guenette , P. Guzowski , E. Hall , P. Hamilton , O. Hen , G. A. Horton-Smith , A. Hourlier , E. C. Huang , R. Itay , C. James , J. Jan de Vries , X. Ji , L. Jiang , J. H. Jo , R. A. Johnson , Y. J. Jwa , N. Kamp , G. Karagiorgi , W. Ketchum , B. Kirby , M. Kirby , T. Kobilarcik , I. Kreslo , R. LaZur , I. Lepetic , K. Li , Y. Li , B. R. Littlejohn , D. Lorca , W. C. Louis , X. Luo , A. Marchionni , S. Marcocci , C. Mariani , D. Marsden , J. Marshall , J. Martin-Albo , D. A. Martinez Caicedo , K. Mason , A. Mastbaum , N. McConkey , V. Meddage , T. Mettler , K. Miller , J. Mills , K. Mistry , T. Mohayai , A. Mogan , J. Moon , M. Mooney , A. F. Moor , C. D. Moore , J. Mousseau , M. Murphy , D. Naples , A. Navrer-Agasson , R. K. Neely , P. Nienaber , J. Nowak , O. Palamara , V. Paolone , A. Papadopoulou , V. Papavassiliou , S. F. Pate , A. Paudel , Z. Pavlovic , E. Piasetzky , I. Ponce-Pinto , D. Porzio , S. Prince , X. Qian , J. L. Raaf , V. Radeka , A. Rafique , M. Reggiani-Guzzo , L. Ren , L. Rochester , J. Rodriguez Rondon , H. E. Rogers , M. Rosenberg , M. Ross-Lonergan , B. Russell , G. Scanavini , D. W. Schmitz , A. Schukraft , M. H. Shaevitz , R. Sharankova , J. Sinclair , A. Smith , E. L. Snider , M. Soderberg , S. Soldner-Rembold , S. R. Soleti , P. Spentzouris , J. Spitz , M. Stancari , J. St. John , T. Strauss , K. Sutton , S. Sword-Fehlberg , A. M. Szelc , N. Tagg , W. Tang , K. Terao , R. T. Thornton , C. Thorpe , M. Toups , Y. -T. Tsai , S. Tufanli , M. A. Uchida , T. Usher , W. Van De Pontseele , R. G. Van de Water , B. Viren , M. Weber , H. Wei , Z. Williams , S. Wolbers , T. Wongjirad , M. Wospakrik , W. Wu , T. Yang , G. Yarbrough , L. E. Yates , G. P. Zeller , J. Zennamo , C. Zhang

Continuous data acquisition for liquid argon time projection chamber neutrino detectors using FPGA-based real-time compression algorithms

Liquid argon time projection chambers (LArTPCs) have been proposed as neutrino detectors that combine both large sizes to maximize the number of neutrino interactions and detailed recording of the interaction. The readout of thousands of…

仪器与探测器 · 物理学 2021-02-12 J. I. Crespo-Anadón

Recent results from MicroBooNE

Modelling and reconstructing neutrino-nucleus scattering is difficult, but it is crucial to do it precisely to enable next-generation oscillation measurements. Liquid argon time projection chambers (LArTPCs), such as MicroBooNE, can be the…

高能物理 - 实验 · 物理学 2025-06-05 Holly B. Parkinson , for the MicroBooNE Collaboration

High-performance Generic Neutrino Detection in a LArTPC near the Earth's Surface with the MicroBooNE Detector

Large Liquid Argon Time Projection Chambers (LArTPCs) are being increasingly adopted in neutrino oscillation experiments because of their superb imaging capabilities through the combination of both tracking and calorimetry in a fully active…

高能物理 - 实验 · 物理学 2023-12-18 MicroBooNE collaboration , P. Abratenko , M. Alrashed , R. An , J. Anthony , J. Asaadi , A. Ashkenazi , S. Balasubramanian , B. Baller , C. Barnes , G. Barr , V. Basque , L. Bathe-Peters , O. Benevides Rodrigues , S. Berkman , A. Bhanderi , A. Bhat , M. Bishai , A. Blake , T. Bolton , L. Camilleri , D. Caratelli , I. Caro Terrazas , R. Castillo Fernandez , F. Cavanna , G. Cerati , Y. Chen , E. Church , D. Cianci , J. M. Conrad , M. Convery , L. Cooper-Troendle , J. I. Crespo-Anadon , M. Del Tutto , D. Devitt , R. Diurba , L. Domine , R. Dorrill , K. Duffy , S. Dytman , B. Eberly , A. Ereditato , L. Escudero Sanchez , J. J. Evans , G. A. Fiorentini Aguirre , R. S. Fitzpatrick , B. T. Fleming , N. Foppiani , D. Franco , A. P. Furmanski , D. Garcia-Gamez , S. Gardiner , G. Ge , S. Gollapinni , O. Goodwin , E. Gramellini , P. Green , H. Greenlee , W. Gu , R. Guenette , P. Guzowski , L. Hagaman , E. Hall , P. Hamilton , O. Hen , G. A. Horton-Smith , A. Hourlier , E. C. Huang , R. Itay , C. James , J. Jan de Vries , X. Ji , L. Jiang , J. H. Jo , R. A. Johnson , Y. J. Jwa , N. Kamp , N. Kaneshige , G. Karagiorgi , W. Ketchum , B. Kirby , M. Kirby , T. Kobilarcik , I. Kreslo , R. LaZur , I. Lepetic , K. Li , Y. Li , B. R. Littlejohn , D. Lorca , W. C. Louis , X. Luo , A. Marchionni , C. Mariani , D. Marsden , J. Marshall , J. Martin-Albo , D. A. Martinez Caicedo , K. Mason , A. Mastbaum , N. McConkey , V. Meddage , T. Mettler , K. Miller , J. Mills , K. Mistry , T. Mohayai , A. Mogan , J. Moon , M. Mooney , A. F. Moor , C. D. Moore , L. Mora Lepin , J. Mousseau , M. Murphy , D. Naples , A. Navrer-Agasson , R. K. Neely , P. Nienaber , J. Nowak , O. Palamara , V. Paolone , A. Papadopoulou , V. Papavassiliou , S. F. Pate , A. Paudel , Z. Pavlovic , E. Piasetzky , I. Ponce-Pinto , D. Porzio , S. Prince , X. Qian , J. L. Raaf , V. Radeka , A. Rafique , M. Reggiani-Guzzo , L. Ren , L. Rochester , J. Rodriguez Rondon , H. E. Rogers , M. Rosenberg , M. Ross-Lonergan , B. Russell , G. Scanavini , D. W. Schmitz , A. Schukraft , W. Seligman , M. H. Shaevitz , R. Sharankova , J. Sinclair , A. Smith , E. L. Snider , M. Soderberg , S. Soldner-Rembold , S. R. Soleti , P. Spentzouris , J. Spitz , M. Stancari , J. St. John , T. Strauss , K. Sutton , S. Sword-Fehlberg , A. M. Szelc , N. Tagg , W. Tang , K. Terao , C. Thorpe , M. Toups , Y. -T. Tsai , S. Tufanli , M. A. Uchida , T. Usher , W. Van De Pontseele , B. Viren , M. Weber , H. Wei , Z. Williams , S. Wolbers , T. Wongjirad , M. Wospakrik , W. Wu , E. Yandel , T. Yang , G. Yarbrough , L. E. Yates , H. W. Yu , G. P. Zeller , J. Zennamo , C. Zhang

Neutrino-argon cross-section measurements from the MicroBooNE experiment

MicroBooNE is a liquid argon time projection chamber (LArTPC) neutrino detector located along the Fermilab Booster Neutrino Beam and 8 degrees off-axis to the Neutrinos at the Main Injector beam. MicroBooNE collected data from both beams…

高能物理 - 实验 · 物理学 2026-02-02 Liang Liu

Demonstration and performance of an online data selection algorithm for liquid argon time projection chambers using MicroBooNE

The MicroBooNE detector is a liquid argon time projection chamber (LArTPC) that produces three-dimensional images of particle interactions using ionization charge collected by anode wire plane arrays and scintillation light collected by a…

高能物理 - 实验 · 物理学 2026-02-12 MicroBooNE collaboration , P. Abratenko , D. Andrade Aldana , L. Arellano , J. Asaadi , A. Ashkenazi , S. Balasubramanian , B. Baller , A. Barnard , G. Barr , D. Barrow , J. Barrow , V. Basque , J. Bateman , B. Behera , O. Benevides Rodrigues , S. Berkman , A. Bhat , M. Bhattacharya , V. Bhelande , A. Binau , M. Bishai , A. Blake , B. Bogart , T. Bolton , M. B. Brunetti , L. Camilleri , D. Caratelli , F. Cavanna , G. Cerati , A. Chappell , Y. Chen , J. M. Conrad , M. Convery , L. Cooper-Troendle , J. I. Crespo-Anadon , R. Cross , M. Del Tutto , S. R. Dennis , P. Detje , R. Diurba , Z. Djurcic , K. Duffy , S. Dytman , B. Eberly , P. Englezos , A. Ereditato , J. J. Evans , C. Fang , B. T. Fleming , W. Foreman , D. Franco , A. P. Furmanski , F. Gao , D. Garcia-Gamez , S. Gardiner , G. Ge , S. Gollapinni , E. Gramellini , P. Green , H. Greenlee , L. Gu , W. Gu , R. Guenette , P. Guzowski , L. Hagaman , M. D. Handley , O. Hen , A. Hergenhan , M. Harrison , S. Hawkins , C. Hilgenberg , G. A. Horton-Smith , A. Hussain , B. Irwin , M. S. Ismail , C. James , X. Ji , J. H. Jo , A. Johnson , R. A. Johnson , D. Kalra , G. Karagiorgi , W. Ketchum , A. Kelly , M. Kirby , T. Kobilarcik , K. Kumar , N. Lane , J. -Y. Li , Y. Li , K. Lin , B. R. Littlejohn , L. Liu , S. Liu , W. C. Louis , X. Luo , T. Mahmud , N. Majeed , C. Mariani , J. Marshall , N. Martinez , D. A. Martinez Caicedo , F. Martinez Lopez , M. G. Manuel Alves , S. Martynenko , A. Mastbaum , I. Mawby , N. McConkey , B. McConnell , L. Mellet , J. Mendez , J. Micallef , T. Mohayai , A. Mogan , M. Mooney , A. F. Moor , C. D. Moore , L. Mora Lepin , M. A. Hernandez Morquecho , M. M. Moudgalya , S. Mulleria Babu , D. Naples , A. Navrer-Agasson , N. Nayak , M. Nebot-Guinot , C. Nguyen , L. Nguyen , J. Nowak , N. Oza , O. Palamara , N. Pallat , V. Paolone , A. Papadopoulou , V. Papavassiliou , H. Parkinson , S. F. Pate , N. Patel , Z. Pavlovic , E. Piasetzky , K. Pletcher , I. Pophale , X. Qian , J. L. Raaf , V. Radeka , A. Rafique , M. Reggiani-Guzzo , J. Rodriguez Rondon , M. Rosenberg , M. Ross-Lonergan , I. Safa , D. W. Schmitz , A. Schukraft , W. Seligman , M. H. Shaevitz , R. Sharankova , J. Shi , L. Silva , E. L. Snider , S. Soldner-Rembold , J. Spitz , M. Stancari , J. St. John , T. Strauss , A. M. Szelc , N. Taniuchi , K. Terao , C. Thorpe , D. Torbunov , D. Totani , M. Toups , A. Trettin , Y. -T. Tsai , J. Tyler , M. A. Uchida , T. Usher , B. Viren , J. Wang , L. Wang , M. Weber , H. Wei , A. J. White , S. Wolbers , T. Wongjirad , K. Wresilo , W. Wu , E. Yandel , T. Yang , L. E. Yates , H. W. Yu , G. P. Zeller , J. Zennamo , C. Zhang , Y. Zhang

MicroBooNE, A Liquid Argon Time Projection Chamber (LArTPC) Neutrino Experiment

Liquid Argon time projection chamber (LArTPC) is a promising detector technology for future neutrino experiments. MicroBooNE is an upcoming LArTPC neutrino experiment which will be located on-axis of Booster Neutrino Beam (BNB) at Fermilab,…

高能物理 - 实验 · 物理学 2015-05-28 Teppei Katori

First demonstration of $\mathcal{O}(1\,\text{ns})$ timing resolution in the MicroBooNE liquid argon time projection chamber

MicroBooNE is a neutrino experiment located in the Booster Neutrino Beamline (BNB) at Fermilab, which collected data from 2015 to 2021. MicroBooNE's liquid argon time projection chamber (LArTPC) is accompanied by a photon detection system…

高能物理 - 实验 · 物理学 2023-08-31 MicroBooNE collaboration , P. Abratenko , O. Alterkait , D. Andrade Aldana , J. Anthony , L. Arellano , J. Asaadi , A. Ashkenazi , S. Balasubramanian , B. Baller , G. Barr , J. Barrow , V. Basque , O. Benevides Rodrigues , S. Berkman , A. Bhanderi , M. Bhattacharya , M. Bishai , A. Blake , B. Bogart , T. Bolton , J. Y. Book , L. Camilleri , Y. Cao , D. Caratelli , I. Caro Terrazas , F. Cavanna , G. Cerati , Y. Chen , J. M. Conrad , M. Convery , L. Cooper-Troendle , J. I. Crespo-Anadon , M. Del Tutto , S. R. Dennis , P. Detje , A. Devitt , R. Diurba , Z. Djurcic , R. Dorrill , K. Duffy , S. Dytman , B. Eberly , A. Ereditato , J. J. Evans , R. Fine , O. G. Finnerud , B. T. Fleming , N. Foppiani , W. Foreman , D. Franco , A. P. Furmanski , D. Garcia-Gamez , S. Gardiner , G. Ge , S. Gollapinni , O. Goodwin , E. Gramellini , P. Green , H. Greenlee , W. Gu , R. Guenette , P. Guzowski , L. Hagaman , O. Hen , R. Hicks , C. Hilgenberg , G. A. Horton-Smith , Z. Imani , B. Irwin , R. Itay , C. James , X. Ji , L. Jiang , J. H. Jo , R. A. Johnson , Y. J. Jwa , D. Kalra , N. Kamp , G. Karagiorgi , W. Ketchum , M. Kirby , T. Kobilarcik , I. Kreslo , M. B. Leibovitch , I. Lepetic , J. -Y. Li , K. Li , Y. Li , K. Lin , B. R. Littlejohn , W. C. Louis , X. Luo , C. Mariani , D. Marsden , J. Marshall , N. Martinez , D. A. Martinez Caicedo , K. Mason , A. Mastbaum , N. McConkey , V. Meddage , K. Miller , J. Mills , K. Mistry , T. Mohayai , A. Mogan , M. Mooney , A. F. Moor , C. D. Moore , L. Mora Lepin , J. Mousseau , S. Mulleria Babu , D. Naples , A. Navrer-Agasson , N. Nayak , M. Nebot-Guinot , J. Nowak , N. Oza , O. Palamara , N. Pallat , V. Paolone , A. Papadopoulou , V. Papavassiliou , H. Parkinson , S. F. Pate , N. Patel , Z. Pavlovic , E. Piasetzky , I. Ponce-Pinto , I. Pophale , S. Prince , X. Qian , J. L. Raaf , V. Radeka , A. Rafique , M. Reggiani-Guzzo , L. Ren , L. Rochester , J. Rodriguez Rondon , M. Rosenberg , M. Ross-Lonergan , C. Rudolph von Rohr , G. Scanavini , D. W. Schmitz , A. Schukraft , W. Seligman , M. H. Shaevitz , R. Sharankova , J. Shi , E. L. Snider , M. Soderberg , S. Soldner-Rembold , J. Spitz , M. Stancari , J. St. John , T. Strauss , S. Sword-Fehlberg , A. M. Szelc , W. Tang , N. Taniuchi , K. Terao , C. Thorpe , D. Torbunov , D. Totani , M. Toups , Y. -T. Tsai , J. Tyler , M. A. Uchida , T. Usher , B. Viren , M. Weber , H. Wei , A. J. White , Z. Williams , S. Wolbers , T. Wongjirad , M. Wospakrik , K. Wresilo , N. Wright , W. Wu , E. Yandel , T. Yang , L. E. Yates , H. W. Yu , G. P. Zeller , J. Zennamo , C. Zhang

Potential for Supernova Neutrino Detection in MiniBooNE

The MiniBooNE detector at Fermilab is designed to search for $\nu_\mu \to \nu_e$ oscillation appearance at $E_\nu \sim 1 {\rm GeV}$ and to make a decisive test of the LSND signal. The main detector (inside a veto shield) is a spherical…

高能物理 - 唯象学 · 物理学 2009-11-07 Matthew K. Sharp , John F. Beacom , Joseph A. Formaggio

The SuperNova Early Warning System

A core collapse in the Milky Way will produce an enormous burst of neutrinos in detectors world-wide. Such a burst has the potential to provide an early warning of a supernova's appearance. I will describe the nature of the signal, the…

天体物理学 · 物理学 2009-06-23 K. Scholberg

Automated proton track identification in MicroBooNE using gradient boosted decision trees

MicroBooNE is a liquid argon time projection chamber (LArTPC) neutrino experiment that is currently running in the Booster Neutrino Beam at Fermilab. LArTPC technology allows for high-resolution, three-dimensional representations of…

仪器与探测器 · 物理学 2017-10-04 Katherine Woodruff , the MicroBooNE Collaboration

Supernova Neutrino Detection

A core-collapse supernova will produce an enormous burst of neutrinos of all flavors in the few-tens-of-MeV range. Measurement of the flavor, time and energy structure of a nearby core-collapse neutrino burst will yield answers to many…

天体物理仪器与方法 · 物理学 2012-11-20 Kate Scholberg

Neutrino Scattering Studies in MicroBooNE

A good understanding of the cross sections for neutrino interactions with nucleons and nuclei is crucial for neutrino oscillation studies, in addition to providing a tool for the exploration of nucleon and nuclear structures. The MicroBooNE…

高能物理 - 实验 · 物理学 2018-10-15 Vassili Papavassiliou

Enhanced low-energy supernova burst detection in large liquid argon time projection chambers enabled by Q-Pix

The detection of neutrinos from core-collapse supernovae may reveal important process features as well as neutrino properties. The detection of supernova neutrinos is one of the main science drivers for future kiloton-scale neutrino…

高能物理 - 实验 · 物理学 2022-08-16 S. Kubota , J. Ho , A. D. McDonald , N. Tata , J. Asaadi , R. Guenette , J. B. R. Battat , D. Braga , M. Demarteau , Z. Djurcic , M. Febbraro , E. Gramellini , S. Kohani , C. Mauger , Y. Mei , F. M. Newcomer , K. Nishimura , D. Nygren , R. Van Berg , G. S. Varner , K. Woodworth

Exploring Neutrino Interactions with MicroBooNE

Recently, MiniBooNE observed an electromagnetic excess at low energy. What is the nature of this excess? What about the nature of the low-energy excess at LSND 20 years ago? The MicroBooNE detector will see neutrinos from the same Booster…

仪器与探测器 · 物理学 2014-11-18 Tia Miceli

MicroBooNE: A New Liquid Argon Time Projection Chamber Experiment

Liquid Argon Time Projection Chamber detectors are well suited to study neutrino interactions, and are an intriguing option for future massive detectors capable of measuring the parameters that characterize neutrino oscillations. These…

仪器与探测器 · 物理学 2010-02-10 M. Soderberg

The SNEWS 2.0 Alert Software for the Coincident Detection of Neutrinos from Core-Collapse Supernovae

The neutrino signal from the next galactic core-collapse supernova will provide an invaluable early warning of the explosion. By combining the burst trigger from several neutrino detectors, the location of the explosion can be triangulated…

天体物理仪器与方法 · 物理学 2024-07-04 M. Kara , S. Torres-Lara , A. Baxter-Depoian , S. BenZvi , M. Colomer Molla , A. Habig , J. P. Kneller , M. Lai , R. F. Lang , M. Linvill , D. Milisavljevic , J. Migenda , C. Orr , K. Scholberg , J. Smolsky , J. Tseng , C. D. Tunnell , J. Vasel , A. Sheshukov

Detecting Neutrinos from Supernova Bursts in PandaX-4T

Neutrinos from core-collapse supernovae are essential for the understanding of neutrino physics and stellar evolution. The dual-phase xenon dark matter detectors can provide a way to track explosions of galactic supernovae by detecting…

高能物理 - 实验 · 物理学 2024-03-12 Binyu Pang , Abdusalam Abdukerim , Zihao Bo , Wei Chen , Xun Chen , Chen Cheng , Zhaokan Cheng , Xiangyi Cui , Yingjie Fan , Deqing Fang , Changbo Fu , Mengting Fu , Lisheng Geng , Karl Giboni , Linhui Gu , Xuyuan Guo , Chencheng Han , Ke Han , Changda He , Jinrong He , Di Huang , Yanlin Huang , Junting Huang , Zhou Huang , Ruquan Hou , Yu Hou , Xiangdong Ji , Yonglin Ju , Chenxiang Li , Jiafu Li , Mingchuan Li , Shuaijie Li , Tao Li , Qing Lin , Jianglai Liu , Congcong Lu , Xiaoying Lu , Lingyin Luo , Yunyang Luo , Wenbo Ma , Yugang Ma , Yajun Mao , Yue Meng , Xuyang Ning , Ningchun Qi , Zhicheng Qian , Xiangxiang Ren , Nasir Shaheed , Xiaofeng Shang , Xiyuan Shao , Guofang Shen , Lin Si , Wenliang Sun , Andi Tan , Yi Tao , Anqing Wang , Meng Wang , Qiuhong Wang , Shaobo Wang , Siguang Wang , Wei Wang , Xiuli Wang , Zhou Wang , Yuehuan Wei , Mengmeng Wu , Weihao Wu , Jingkai Xia , Mengjiao Xiao , Xiang Xiao , Pengwei Xie , Binbin Yan , Xiyu Yan , Jijun Yang , Yong Yang , Yukun Yao , Chunxu Yu , Ying Yuan , Zhe Yuan , Xinning Zeng , Dan Zhang , Minzhen Zhang , Peng Zhang , Shibo Zhang , Shu Zhang , Tao Zhang , Wei Zhang , Yang Zhang , Yingxin Zhang , Yuanyuan Zhang , Li Zhao , Qibin Zheng , Jifang Zhou , Ning Zhou , Xiaopeng Zhou , Yong Zhou , Yubo Zhou

Online triggers for supernova and pre-supernova neutrino detection with cryogenic detectors

Supernovae (SNe) are among the most energetic events in the universe still far from being fully understood. An early and prompt detection of neutrinos is a one-time opportunity for the realization of the first multi-messenger observation of…

天体物理仪器与方法 · 物理学 2022-10-24 Philipp Eller , Nahuel Ferreiro Iachellini , Luca Pattavina , Lolian Shtembari

Dedicated Supernova Detection by a Network of Neutral Current Spherical TPC's

Supernova neutrinos can easily be detected by a spherical gaseous TPC detector measuring very low energy nuclear recoils. The expected rates are quite large for a neutron rich target since the neutrino nucleus neutral current interaction…

天体物理学 · 物理学 2009-11-13 J. D. Vergados , Y. Giomataris