Institute for Nuclear and Particle Astrophysics (INPA) at LBNL
The INPA Seminar weekly talks are on Fridays, starting at 12:00 pm, unless informed otherwise. The seminar talk starts with a brief presentation of the weekly scientific news. Typically, the talks conclude by 1:00 pm. The seminars are held in the Sessler Conference Room, located in Bldg. 50A- 5132.
Please send all suggestions for future INPA talks and speakers to the INPA Committee.
To be added to the INPA News Mailing List, please contact Erica Hall.
INPA Talks are archived here.
The INPA Committee currently consists of:
2025-26
Daniel Kodroff
Krystal Alfonso
Edmond Chaussidon
- This event has passed.
INPA Seminar Speaker: Lorenzo Magrini (Stanford)-Title: A search for short-range new interactions with Mössbauer spectroscopy
May 8 @ 12:00 pm - 1:00 pm
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.
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=Tk1XOW1Xd3RYRnlsc2tEYmRWZlVVZz09
Meeting ID: 950 1669 6011
Passcode: 247722
INPA guests from campus can now come to the lab early on Fridays. The INPA Common Room (50-5026) is reserved for our guests from 10:00 a.m. to 12:00 noon and from 1 p.m. to 5 p.m. Note that the seminars are now held in 50A-5132 to accommodate a more significant number of attendees.
CPTea Series (also known as INPA Tea Series)
The Physics Division CPTea Series invites you to an In-Person Tea Series 1st Friday of every month at 3:30 pm INPA Conference Room 50-5026.
Everyone is welcome to attend the open forum. Tea and light refreshments will be served.
INPA Common Room (50-5026)
Fridays
3:30 pm
Access to the Lab
For a shuttle pass, please email Erica Hall. The pass is only valid for the day of the seminar.