Ding Xuefeng (丁雪峰)
Email: xuefeng.ding@gssi.it Mobile: (+39) 349-460-1509
Homepage: https://dingxf.cn GitHub: https://github.com/DingXuefeng!
Address: GSSI, Francesco Crispi 7, L’Aquila, AQ, Italy 67100
Profile:
Ph.D. candidate in particle physics with strong experience at LNGS on low background experiments.
Developer of GooStats, a graphics processing units accelerated multivariate fitting program
EDUCATION:!
Gran Sasso Science Institute (INFN), L’Aquila, AQ
Ph.D. in Astro-particle Physics GPA 3.71/4.00 (Expected January 2019)
Wuhan University, School of Physics and Technology, Wuhan
Master degree in theoretical physics, GPA 3.56/4.00 (June 2015)
Bachelor degree in physics. GPA 3.74/4.00 (June 2012)
RESEARCH EXPERIENCE:
Visiting researcher, Borexino and JUNO Experiments (2016—Present)!
Laboratori Nazionali del Gran Sasso, INFN, Assergi, AQ, Italy 67100 (Borexino) !
Phd Advisor: Dr. Nicola Rossi (Borexino) Dr. Matteo Agostini (Borexino) Dr. Gioacchino Ranucci (JUNO) !
Working Thesis – High Precision solar neutrino physics with Borexino and JUNO experiments
Key Responsibilities and Accomplishments:
Leader of the development of Graphics Processing Unit based fitting tool for Borexino analytical
multivariate fit analysis (github-GooStats) and speed up fitting time from days to seconds.
Lead the evaluation of the shape-related systematic uncertainty for Borexino solar analysis.
Evaluated Borexino’s sensitivity on solar CNO neutrinos and impact of shape related systematics.
3% precision measurement of solar ν(
7
Be) neutrinos on Borexino Phase-II data using a new method (charge).
Developed a procedure to precisely track the detector light yield to get over the disadvantage that we have
no frequent calibrations. The tracked light yield is also used as a new input for Monte Carlo simulation.
Developed clusterization algorithm to suppress
14
C and dark noise and solar neutrino generator for JUNO
(Recent) Evaluated JUNO’s background level and preliminary implied 2 MeV detection threshold of solar
8
B
neutrinos. This would be a direct measurement of MSW transition zone. (paper coming).
SKILLS
Geant4 simulation.
Statistical inference.
Laboratory equipment, chemical sample procurement; Drafting contracts.
C++, python, ROOT, CUDA(GPU), bash, CMake, perl, php, CMT, VASP, CASTEP, Javascript
Medium scale software design/test and management (UML/gdb/git…)
Server maintenance (apache+mySQL+PHP, DocDB, see dingxf.cn).
Operation of commercial UV-vis spectrometer and fluorescence spectrometer.
Invited Talks !
Latest Phase-II results and Prospects of CNO neutrino detection with Borexino. International Symposium
of Neutrino Frontier. 2018 July 16-19. ICISE center, Quy Nhon, Vietnam. (Plenary)
Status and Physics of JUNO. The 20th International Workshop on Neutrinos from Accelerators. 2018 August
12-18. Virginia Tech. Blacksburg, VA, U.S. (Plenary)#
MAJOR COLLABORATORS
Prof. Gioacchino Ranucci, INFN-Milano. JUNO co-spokesperson. Borexino project manager. PHD
supervisor. JUNO.
Prof. Frank Calaprice, Princeton University. 2017—now. Borexino (CNO sensitivity, light yield stability)
Prof. Jun Cao, Institute of high energy physics. 2013—2015. Daya Bay and JUNO spokesperson. master
supervisor. Daya Bay and JUNO.
Dr. Nicola Rossi, INFN-Roma-I. PHD supervisor. PHD supervisor. Borexino.
Dr. Matteo Agostini, Technical University of Munich. 2016—now. PHD supervisor. Borexino (Systematics)
Prof. Yufeng Li, Insitute of High Energy Physics. 2013—now. JUNO solar
8
B neutrino sensitivity.
Prof. Oleg Smirnov, Joint Institute for Nuclear Research, 2015—now. Borexino analytical fit.
Prof. Emanuela Meroni, University of Milano. 2016—now. JUNO solar
7
Be neutrino sensitivity.
Prof. Luca Stanco, University of Padova, 2018—now. JUNO mass hierarchy sensitivity.
SELECTED PUBLICATIONS
Borexino collaboration, Comprehensive measurement of pp-chain solar neutrinos with Borexino, Nature,
(2018), accepted
(Xuefeng has developed the fitting framework and corresponding module for extracting solar neutrino
interaction rate. He also evaluated the shape related systematic uncertainties. Besides, he led the charge based
analysis and contributed to building the analytical non-linearity and resolution model of the npmt analysis.
And he is responsible for data preparation of m-stats Monte Carlo analysis group.)
Qin Liu, et al., A vertex reconstruction algorithm in the central detector of JUNO. JINST 13 (2018) no.9,
T09005 DOI: 10.1088/1748-0221/13/09/T09005, ARXIV: 1803.09394
(Xuefeng improved the precision and the speed of the reconstruction algorithm.)
Borexino collaboration, Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino
data. Phys.Rev.D 96 (2017) no.9, 091103 DOI: 10.1103/PhysRevD.96.091103, ARXIV: 1707.09355
(Xuefeng developed the fitting software framework GooStats for neutrino magnetic moment analysis.)
JUNO collaboration, JUNO Conceptual Design Report, ARXIV: 1508.07166
(Xuefeng has participated in optimizing the detector design using Monte Carlo simulations, including
comparing different center detector scheme, optimizing the thickness of water buffer, arranging PMTs.)
Daya Bay collaboration, Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
Phys.Rev.Lett. 116 (2016) no.6, 061801, Erratum: Phys.Rev.Lett. 118 (2017) no.9, 099902 DOI: 10.1103/
PhysRevLett.116.061801, ARXIV: 1508.04233
(Xuefeng has evaluated the n-Gd capture γ spectrum induced delayed energy cut efficiency systematics.)
X. F. Ding et al., Measurement of the fluorescence quantum yield of bis-MSB Chin.Phys.C 39 (2015) no.
12, 126001 DOI: 10.1088/1674-1137/39/12/126001, ARXIV: 1506.00240
(As the corresponding author, Xuefeng take the full responsibility of design, contracting, sample preparation,
equipment operation, data analysis and paper drafting of this measurement.)
D. M. Xiao et al., Temperature dependence of the light yield of the LAB-based and mesitylene-based
liquid scintillators Chin.Phys.C 38 (2014) no.11, 116001 DOI: 10.1088/1674-1137/38/11/116001 ARXIV:
1402.6871
(Xuefeng has participated the monitoring of the cryogenic tank temperature and analyzing LS transparencies.)
HONORS AND AWARDS!
Chinese government award for outstanding self finance students abroad (2017)
500 Chinese PHD students taking Chinese government scholarship studying abroad selected world-widely
based on the academic achievements (i.e. accomplished projects, published papers, recommendation letters).
OUTREACH
Guide of Borexino. Chinese embassy visit to LNGS. 2016.
A PHD’s imagination towards Science and Career. Outstanding student award ceremony and Italy Chinese
Student Union Salon, 19. July. 2018
TEACHING EXPERIENCE!
Teaching Assistant, School of physics and technology, Wuhan University (2013-2014)
• Teaching assistance of thermal dynamics and statistical physics for undergraduates
TRAINING AND SUMMER SCHOOL
2012 (Course) Software and Application of Density functional theory. Wuhan, China
2014 International Neutrino Summer School, Beijing, China
2015 Advanced application of the fluorescence spectrometer, provided by HORIBA inc. Beijing, China
2016 ISAPP(summer school): using particle physics to understand and image the earth. L’Aquila, Italy
2017 INFN school of statistics. Ischia, Italy
2017 Architectures, tools and methodologies for developing efficient large scale scientific computing
applications, Bertinoro, Italy
ACTIVITIES AND INTERESTS
Head of Choir of the physics department in Wuhan University in 2009, organizing the weekly practice for the
annual Wuhan University Golden Autumn Art & Music Festival.
Leader of the team in the Physics Carnival, co-ordinating the experiment activities and discussions.
Maintainer of the university multimedia website (pt.whu.edu.cn) during its early times.
Lecturer in Wuhan University Web design and website construction association (student association).
Reference
Updated on Friday, 19 October 2018
MORE RESEARCH EXPERIENCE
Master student, Daya Bay and JUNO Experiments (2011—2015)!
Institute of High Energy Physics, Experiment Physics Center, Beijing, China 100049!
Master Advisor: Dr. Cao Jun, Dr. Zhou Xiang!
Master Thesis – Monte Carlo study of Daya Bay and JUNO detector
Key Responsibilities and Accomplishments:
Measured the fluorescence quantum efficiency of PPO and bisMSB in a wider range. I take full
responsibilities for designing the experiment, contracting sampling, operating UV-vis and fluorescence
spectrometer and analyzing data, especially estimating reasonable systematic uncertainties.
Participated in several measurement of liquid scintillator properties, including measurement of temperature
dependence of light yield of LS, dependence on the recipes and measurement of Rayleigh scattering length.
Undergraduate, ab-initio study of Cs(Na)I crystal dual emission for dark matter detection (2011—2012)!
Based in IHEP, China, advisor Dr. Zhou Xiang. Explained the dual emission phenomena of the Cs(Na)I crystal
which improves n/γ discrimination and sensitivity of dark matter detection, using ab-inito calculations.
MORE PUBLICATIONS
Conference talks and seminars
Probing Neutrino Mass Ordering and Solar neutrinos with JUNO detector. The 20th International
Workshop on Neutrinos from Accelerators. 2018 August 12-18. Virginia Tech. Blacksburg, VA, U.S.
Effects influencing the energy non linearity of liquid scintillators and their compensation. Energy Scale
Calibration in Antineutrino Precision Experiments 2018. 2018 June 1-2. MPI für Kernphysik. Heidelberg,
Germany. (Invited)
Dr. Jun CAO
Master degree Supervisor
JUNO spokesperson
+86-010-88235808
caoj@ihep.ac.cn
Dr. Nicola ROSSI
PHD degree Supervisor
Borexino LNGS contact person (till 2017)
+39-06-49914396
nicola.rossi@roma1.infn.it
Dr. Gioacchino RANUCCI
PHD degree Supervisor
JUNO co-spokesperson
+39-02-50317362
gioacchino.ranucci@mi.infn.it
Impact of the Rayleigh scattering on the energy resolution of JUNO detector. Software and analysis in
particle physics. Weihai, China 2013
Prospects and challenges on precision measurements of solar neutrinos from pp-chain and CNO-cycle
with Borexino. Institute of High Energy Physics EPD seminars. Beijing, China 2018 (seminar, URL)
Posters
Measurement of fluorescence quantum efficiency of bisMSB and PPO, Neutrino 2016, 2016, London
Speed up complex multivariate analysis in Borexino analysis with parallel computing based on
Graphics Processing Unit, XV International Conference on Topics in Astroparticle and Underground
Physics, 2017, Sudbury
Speed up complex multivariate analysis in Borexino analysis with parallel computing based on
Graphics Processing Unit, XXVIII International Symposium on Lepton Photon Interactions at High
Energies, 2017, GuangZhou
Borexino Phase-II solar neutrino results, XXVIII International Symposium on Lepton Photon Interactions
at High Energies, 2017, GuangZhou
Clusterization algorithm for sub-MeV events reconstruction in JUNO, Neutrino 2018, 2018, Heidelberg