NPL News Now

July 23, 2019
Dr. Robert Heitz successfully defends his thesis


Congratulations to Dr. Robert Heitz, who successfully defended his thesis on Tue. Apr. 30 before the committee of Liang Yang (chair), Matthias Perdekamp, Caroline Riedl (advisors), Alexey Bezryadin and John Stack. Dr. Heitz’s thesis, entitled “Transverse Momentum Dependent Nucleon Structure from Pions Impinged on a Transversely Polarized Proton Target” describes results from the data collected during the 2015 run of the COMPASS experiment at CERN: left-right asymmetries in Drell-Yan- or J/Psi-production with respect to the transverse target spin direction. Prior to analyzing the data, Dr. Heitz was part of the UIUC team that built a new drift chamber for COMPASS and he was responsible for aligning the several hundred tracking planes of COMPASS.

April 26, 2019
Dr. Thomas Rao successfully defends thesis


Congratulations to Dr. Thomas Rao who successfully defended his thesis on Tue. Apr. 23 before the committee of Jen-Chieh Peng (chair), Doug Beck (advisor), Gordon Baym and Russ Giannetta. Dr. Rao’s thesis, entitled “Transport of 3He for the nEDM experiment at the SNS” described the results of an experiment to measure the diffusion constant of 3He in superfluid 4He. The experiment was carried out at the Harvard laboratory of Ike Silvera, and with the assistance of our technical staff: John Blackburn, Peter Sobel, Eric Thorsland together with Jaakko Koivuniemi and Steve Williamson from NPL, Weijun Yao from ORNL, and James Maxwell from MIT (now JLab).

April 18, 2019
New results on sea-quark asymmetry from SeaQuest


The Fermilab SeaQuest experiment, designed to measure the light sea-quark flavor structure covering the large Bjorken-x region (up to x=0.45), has completed data-taking in July, 2016. The up and down sea-quark distributions are measured using 120 GeV proton beam interacting with liquid hydrogen and deuterium targets. The new result from an analysis of roughly half of the SeaQuest data was just announced in the Deep-Inelastic-Scattering Conference (April 8-12) in Italy. Jason Dove, a UIUC graduate student, presented this new result on behalf of the SeaQuest Collaboration. His talk can be found at:
https://indico.cern.ch/event/749003/contributions/3344635/attachments/1826425/2989273/DIS_slides_v14.pdf
The current UIUC members of the SeaQuest Collaboration include Jason Dove, Hugo Leung, Naomi Makins, Shivangi Prasad, Andrew Chen, and Jen-Chieh Peng

April 18, 2019
A new review article on "Physics with Reactor Neutrinos"


A review article dedicated to the subject of "Physics with Reactor Neutrino", coauthored by Xin Qian at BNL and Jen-Chieh Peng at UIUC, was recently published in 'Report of Progress in Physics'. This article presents the history and highlights of reactor neutrino experiments, including the Daya Bay Neutrino Oscillation experiment, of which UIUC has been a member since inception. The review article, published in Rep. Prog. Phys. 82, 036201 (2019), can be found at:
https://arxiv.org/pdf/1801.05386.pdf

April 18, 2019
Lepton angular distributions in Drell-Yan and Z-boson production


Two recent articles aiming at providing new insights on the origins of the lepton angular distribution in the Drell-Yan and vector-boson production were published. In a series of four articles, the long-standing puzzle of the origins of the violation of the "Lam-Tung" relation in the Drell-Yan process was explained using an intuitive "geometric" picture. This approach is currently being extended to other high-energy hard-scattering processes. The two latest articles appear in Phys. Lett. B789, 356 (2019) and Phys. Rev. D99, 014032 (2019). They can be found at:
https://arxiv.org/pdf/1811.03256.pdf
https://arxiv.org/abs/1808.04398.pdf
These latest papers were co-authored by Wen-Chen Chang, Oleg Teryaev, Daniel Boer, Jen-Chieh Peng (UIUC), Evan McClellan (former UIUC student, now at Jefferson Lab).

February 19, 2019

ACDIS Seminar

Speaker: Ageg Danagoulian, MIT

February 19, 2019
136 Loomis Laboratory
3:30 to 4:30pm

Nuclear disarmament treaties are not sufficient in and of themselves to neutral-ize the existential threat of nuclear weapons. Technologies are necessary for verifying the authenticity of the nuclear warheads undergoing dismantlement before counting them towards a treaty partner’s obligation.Using Monte Carlo simulations and experimental proof-of-concept measurements, these techniques are shown to reveal no isotopic or geometric information about the weapon, while readily detecting hoaxing attempts.The talk will discuss the concept and recent results, and will give a general overview of nuclear security research pursued at MIT.