INPA

INPA Seminar Speaker: Lorenzo Magrini (Stanford)-Title: A search for short-range new interactions with Mössbauer spectroscopy
2026-05-08 12:00 - 13:00 (America/Los_Angeles)
Date: May 8, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: Lorenzo Magrini (Stanford)
Title: A search for short-range new interactions with Mössbauer spectroscopy
Abstract: New light particles, predicted by many proposed extensions of the Standard Model, would manifest as short-range forces between matter. At the nanoscale, electromagnetism is overwhelming, masking anything weaker. Nuclei, on the other hand, sit shielded inside their electron cloud — making them an exceptionally clean place to look. The recoilless 14.4 keV transition in ⁵⁷Fe gives access to this channel with a natural linewidth of ~5 × 10⁻⁹ eV!
I will present an ongoing experiment at Stanford that uses this resonance to probe new interactions between nuclei in the 20–400 nm range. A ⁵⁷Co source illuminates a thin ⁵⁷Fe absorber, while a gold source mass in close proximity would shift the resonance line through the new interaction. I will discuss the design, the systematics that set the ultimate reach, and what we hope to see.
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https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

NO INPA SEMINAR
2026-05-15 12:00 - 13:00, 2026-06-05 12:00 - 13:00, 2026-06-19 12:00 - 13:00, 2026-06-26 12:00 - 13:00, 2026-07-17 12:00 - 13:00, 2026-07-24 12:00 - 13:00, 2026-07-31 12:00 - 13:00

INPA Seminar Speaker: Jakob Robnik (UC Berkeley)-Title: Feasible MCMC in high-dimensional parameter spaces
2026-05-22 12:00 - 13:00
Date: May 22, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: Jakob Robnik (UC Berkeley)
Title: Feasible MCMC in high-dimensional parameter spaces
Abstract: Statistical inference increasingly takes place in high-dimensional parameter spaces (thousands to billions of parameters) and is commonly the computational bottleneck of scientific workflows. To make this task scalable, we have developed Microcanonical Langevin Monte Carlo (MCLMC), the first out-of-the-box MCMC algorithm without Metropolis adjustment. Avoiding the adjustment yields superior scaling with the problem’s dimensionality, while still maintaining error guarantees. MCLMC outperforms current state-of-the-art samplers, such as the No-U-Turn Sampler (NUTS), across all the problems we considered. For example, for cosmological field-level inference from galaxy surveys with 2 million parameters, MCLMC inference takes 4 hours while NUTS needs more than 3 days for the same accuracy and computational resources. The gains continue to grow as the dimensionality increases. This kind of improvement can lead to scientific breakthroughs, for example, by enabling optimal information extraction or by enabling the study of solid-state systems of unprecedented size. In the talk, I will give intuition for how scalable MCMC must be in high dimensions, and then introduce MCLMC. I will show practical applications to benchmarks, lattice field theories, cosmological field-level inference, and Bayesian neural networks.
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https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA Seminar Speaker: TBD
2026-05-29 12:00 - 13:00
Date: May 29, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

NO INPA Seminar Speaker
2026-06-12 12:00 - 13:00
Date: June 12, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

NO INPA SEMINAR
2026-07-03 12:00 - 13:00
Date: July 3, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA Seminar Speaker: Prof. Pranava Teja Surukuchi (University of Pittsburgh​)-Title: In the End, It Does Matter: Probing the Neutrino Mass at the Endpoint
2026-07-10 12:00 - 13:00
Date: July 10, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: Prof. Pranava Teja Surukuchi (University of Pittsburgh​)
Title: ​In the End, It Does Matter: Probing the Neutrino Mass at the Endpoint
Abstract: The neutrino remains one of the Standard Model’s greatest mysteries. We have never directly measured its mass, do not know how it acquires mass, and do not know whether it is its own antiparticle. All these can be addressed through precision measurements near the Q-value of beta decays.
Project 8 uses Cyclotron Radiation Emission Spectroscopy (CRES) to measure the endpoint of the tritium beta-decay spectrum (Q = 18.6 keV) and extract the neutrino mass. The experiment has placed the first CRES-based neutrino mass limit and is currently working toward demonstrating the scalability needed to reach sub-eV sensitivity. CUORE searches for neutrinoless double-beta decay in Te-130 (Q = 2527 keV) using a 988-crystal cryogenic calorimeter array, and has performed the most sensitive search for this process using calorimetric detectors. Upon reaching its target exposure of 3 tonne-years of TeO₂, CUORE will undergo a targeted cryogenic upgrade followed by an additional physics run. The experiment will then transition to CUPID, which will use Mo-100 (Q = 3034 keV) with particle identification for improved background rejection. This talk presents the status and results from both programs and their implications for the neutrino mass scale and nature.
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https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA SEMINAR SPEAKER: Dacheng Xu(Columbia University)- Title: Measurement of the Solar Boron-8 Neutrino Fog with XENONnT
2026-08-07 12:00 - 13:00
Date: August 7, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person] or UC Campus (Physics 375)
Speaker: Dacheng Xu (Columbia University)
Title: Measurement of the Solar Boron-8 Neutrino Fog with XENONnT
Abstract: Coherent elastic neutrino–nucleus scattering (CEvNS) of solar neutrinos is a fundamental Standard Model process and an irreducible background for next-generation dark matter searches, often referred to as the “neutrino fog.” With its large exposure and ultra-low background, XENONnT has reached the sensitivity required to observe this interaction. Using data from the first three science runs, we have searched for Boron-8 solar neutrino CEvNS and rejected the background-only hypothesis at 3.3 sigma. In this talk, I will present a detailed view of the search for solar Boron-8 CEvNS using the full analyzed dataset and discuss its implications for beyond-Standard-Model neutrino physics and light dark matter in neutrino fog.
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]
