Scientists reported the first observations of how nuclei containing strange quarks flow from particle collisions that smash atomic nuclei together at high energies. They specifically tracked the flow patterns of so-called hypernuclei. These hypernuclei contain particles called hyperons (made of at least one strange quark) in addition to ordinary protons and neutrons (known as nucleons).
In Preparation for DUNE, Scientists Examine Modern Nuclear Theory for Neutrino Oscillation Physics
The U.S. particle physics community is preparing for a major research program with the Deep Underground Neutrino Experiment (DUNE). DUNE will study neutrino oscillations. These quantum mechanical oscillations are only possible because neutrinos have mass, albeit it very small masses. Research at DUNE will address key questions about neutrinos, such as whether they and their antineutrino counterparts behave differently.
Spin alignment of vector mesons in heavy-ion collisions as a barometer for fluctuation of strong force fields
Xin-Nian Wang, a senior scientist in the Nuclear Theory Group in Berkeley Lab’s Nuclear Science Division (NSD), and his collaborators have recently published new research (out today in Physical Review Letters) that explains the spin alignment of vector mesons in heavy-ion collisions, as observed by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC).
Fragments
Norman K. Glendenning sadly passed away on September 5th 2022 at the age of 91, after a long illness. He was a distinguished nuclear theorist and a founding member of the Nuclear Theory Group in the NSD. An obituary written by James Symons, Xin-Nian Wang, and Fridolin Weber was recently published by Physics Today and can be found here.
Pioneering NSD scientist Darleane C. Hoffman received the 2023 Enrico Fermi Presidential Award, one of the most prestigious science honors bestowed by the U.S. government, in a special ceremony at Berkeley Lab on Tuesday, June 6th. Hoffman, a nuclear chemist, was honored for her scientific discoveries that advanced the field of nuclear and radiochemistry, for distinguished service to the DOE’s missions in national security and nuclear waste management, and for her sustained leadership in radiochemistry research and education. More details of Darlene’s award, and a video of the ceremony can be found here.
NSD postdoctoral researcher Emil Rofors represented Berkeley Lab at the 2023 National Postdoc Association Annual Conference in Philadelphia. Emil is a postdoctoral researcher in the Applied Nuclear Physics program and a member of the LBNL Postdoc Association board.
NSD established a Twitter account (@LBNLNuclearSci) which is being used to share regular highlights from across the Division and the Laboratory.
NSD welcomes new hires Erich Leistenschneider (Staff Scientist), Ashish Pandav (Postdoctoral Researcher), and Lisa Schlüter (Postdoctoral Researcher).
We are also pleased to host summer interns from a range of programs including the SULI program, SURF, the NNSA Minority Serving Institution Partnership Program, the NSD-led GREAT-NS initiative, and through the N3AS Physics Frontier Center. We welcome Phoebe Andromeda, Julia Dreiling, Brandon Wilson, Israel Galeana, Patrick Francisco, Elijah Dolz, Laylah Chacon, Griffin Rhoads, Samantha Goldberg, Hong Joo Ryoo, Tiana French, Yajat Thanawala, Birgitta Biendarra, Declan Hoban, Bryce Benun, Wan Siyang, Siddhant Mal, Annabelle McCutcheon, Charles- Yu Hong Chan, Jasmine Crawford, Henry Purcell, Malika Golshian, Brandon Lem, Paul Shin, Ashley Rincon, Dylon Fleming, Eddy Alderete, Emma Lynch, Ethan Skeens, Hong Joo Ryoo, Joseph Koplowitz, Sawyer Kaplan, Diego Hernandez Kent.
We also welcome visiting faculty Prof. Wing To who will be working with Gabriel Orebi-Gann.
Inclusion, Diversity, Equity and Accountability Moments
IDEA: Towards More Accessible Research Papers
On April 17, 2023, arXiv.org, a widely-used preprint server, held the 2023 arXiv Accessibility Forum. The purpose of this forum was to educate attendees on the access needs of people with disabilities, discuss the work that needs to be done to meet those needs, and to plan who is responsible for doing that work, all within the context of academia. As arXiv is a preprint server, the focus was primarily on research papers, which create particular barriers to blind researchers. The forum was attended by NSD postdoc Tyler Hague who provided a report to the Division at a recent staff meeting.
The most readily apparent barrier is the consumption of figures and graphics within a paper. The needed solution for this is to include alt-text (short-form, embedded into the image) and/or extended descriptions (longer-form, typically in a different location). These are additional text that describes what is seen in the image and what underlying message is interpreted from it. This text is in contrast to the image captions which tell the reader what the image is without telling them what it looks like. An added benefit that was discussed is that the process of describing a figure often forces authors to more deeply consider the intended takeaway of a figure as well as why that figure is useful for the publication.
Google Docs has this functionality, as shown below:
The other primary barrier discussed was that of software and file formats. The most common tool used for a blind person to interface with a paper is called a “screen reader”. At its core, this software takes the document as an input and then audibly speaks the text that it reads. When a screen reader encounters an image, it looks for alt-text to speak instead. PDF documents often create difficulties for these tools, as they rely on specific PDF tags to indicate where the text is located.
Until very recently, LaTeX completely omitted these tags from the final document. LaTeX still has no alt-text implementation, but that is in development (per the developers present at the forum). However, this still doesn’t solve the problem as many PDF readers discard the tags when reading in a document. While there is a push to improve the landscape of PDF documents, there was also discussion of moving towards HTML based papers. HTML is the gold standard for accessible documents as it is necessarily tagged and supports all major accessibility designs. Many journals have begun creating HTML versions of papers and arXiv is moving to merge their implementation of this, ar5iv.org, with their main repository soon. The HTML version of a paper can be reached simply by replacing the X with a 5 in the URL (example: original, HTML). Right now anyone interested in helping this effort can take the concrete step of checking the HTML versions of their papers for conversion errors and reporting them to the developers using the issue tracker linked at the bottom of the page, which looks like this:
For researchers who attended the forum, the primary expectation was to practice, teach, and normalize the inclusion of alt-text and extended descriptions to ensure that research is accessible. To paraphrase an organizer of the conference: once we are aware of the needs of those in our community, to choose not to meet them is to choose to exclude them.
Recent DEI topics @ NSD Staff Meetings
- April 18, 2023 Autism Awareness Month and Neurodiversity
- May 2, 2023 Mental Health Awareness
- May 16, 2023 Report from the arXiv Accessibility Forum 2023
- May 30, 2023 Pride Month Activities
- June 13, 2023 Implicit Bias
Luminary Cards
To recognize their efforts in the area(s) of Inclusion, Diversity, Equity, and Accountability, the following people received a Luminary Card: Clara Barker (Oxford University), Teresa Calarco, Morgan Morse, Liz Stuart
sPHENIX MVTX Detector Started Commissioning
The MAPS-based VerTeX (MVTX) detector has been recently installed into the center of the sPHENIX experiment at BNL’s Relativistic Heavy Ion Collider (RHIC) in late March. The sPHENIX detector has been under commissioning and together with the STAR detector started RHIC’s 23rd-year operation.
The sPHENIX MVTX detector is based on Monolithic Active Pixel Sensors (MAPS) technology that was pioneered in the STAR’s HFT project and further developed for the ITS upgrade of the ALICE experiment at CERN. The physics goal of the MVTX detector is to conduct precision measurements of heavy quark production in order to characterize the detailed structure and properties of Quark-Gluon Plasma (QGP) matter created in heavy-ion collisions. LBNL scientists from the Relativistic Nuclear Collision (RNC) program led the detector construction, assembly, and survey over the past few years and completed it last summer. The detector was shipped to BNL last fall with all components intact.
The MVTX detector, the most inner subsystem, was the last component installed into the sPHENIX experiment with the help of physicists and engineers from BNL, LANL, LBNL and MIT in late March. The RHIC machine started cool-down in early May. This year’s RHIC run is planned to dedicate significant time for the sPHENIX detector commissioning and is scheduled to finish at the end of September. Fig. 1 shows NSD Staff Scientist Yuan Mei and postdoc Ho San Ko working on the assembly of the MVTX half barrel detector.
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