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.

The committee members are:

The seminar schedule for the Institute for Nuclear and Particle Astrophysics (INPA) is tentative and becomes final a few days before the Friday talk.

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.

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VIRTUAL INPA SEMINAR | Andreas Biekert (UC Berkeley)

October 1, 2021 @ 12:00 pm - 1:00 pm

Speaker: Andreas Biekert (UC Berkeley)

Title: Scintillation Yield From Electronic and Nuclear Recoils In Superfluid 4He 


HeRALD is a proposed sub-GeV scale dark matter detector based on a superfluid 4He target and transition edge sensor readout, supported as part of the TESSERACT project. Possible signal channels available for readout include prompt photons, triplet excimers, and roton and phonon quasiparticles, but the relative strength of these signals for low energy nuclear recoils requires experimental verification. We have measured the superfluid 4He scintillation yield at 1.75 K from nuclear recoils in the range of 50-1100 keV using a 16 cm3 target volume read out by six superfluid-immersed PMTs. Elastic scattering of 2.8 MeV neutrons produced by a deuterium-deuterium neutron generator and Compton scattering of 662 keV 137Cs gamma rays were used to determine the relative scintillation yield. Yields of both prompt and delayed scintillation components were measured and compared to a semi-empirical response model based on helium-helium and electron-helium scattering cross sections. We also discuss the development of a 24 keV neutron source to extend our measurements to smaller nuclear recoil energies.

Join Zoom Meeting

Meeting ID: 916 2579 2208

Passcode: 793885


October 1, 2021
12:00 pm - 1:00 pm

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)
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.

Erica Hall