INPA

NO INPA SEMINAR
2023-10-20 12:00 - 13:00, 2023-10-13 12:00 - 13:00, 2023-09-29 12:00 - 13:00, 2023-09-22 12:00 - 13:00, 2023-08-25 12:00 - 13:00, 2023-06-23 12:00 - 13:00, 2023-05-26 12:00 - 13:00, 2023-05-19 12:00 - 13:00 (America/Los_Angeles)

Speaker: Yifei Luo (UCSC)- Title: The Merian Survey: Characterizing dark matter and feedback in star-forming dwarf galaxies with medium-band filters on DECam
2023-10-06 12:00 - 13:00
Date: Friday, October 6, 2023

Time: 12:00 PM – 1:00 PM
Location: Sessler Conference Room–50A-5132 [Hybrid and In-Person]
Speaker: Yifei Luo(UCSC)
Title: The Merian Survey: Characterizing dark matter and feedback in star-forming dwarf galaxies with medium-band filters on DECam
Abstract: The Merian survey is an ongoing medium-band imaging survey on the CTIO 4-meter Blanco telescope. With two custom made medium-band filters on DECam, we expect to detect 80,000 star-forming dwarf galaxies at z~0.1 in the HSC-SSP wide field, aiming to characterize dark matter halo and stellar feedback in dwarf galaxies. The Merian survey will allow us to measure the full dark matter profile of dwarf galaxies via weak gravitational lensing for the first time. In this talk, I will present how we optimized the Merian filter design for our science goals, and discuss the filter performance with mock and actual Merian data. I will also show that the Merian medium-band filter set is able to select objects at higher redshifts out to z~4.8.
Zoom Information:
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]

Meeting ID: 950 1669 6011
Passcode: [REDACTED]

Speaker: Wenbo Ma (Shanghai Jiao Tong University)-Title: Search for solar neutrino and light dark matter with the PandaX-4T experiment
2023-09-15 12:00 - 13:00
DATE: September 15, 2023
TIME: 12:00- 1:00 PM
LOCATION: 50A-5-5132-CR-Sessler
SPEAKER: Wenbo Ma (Shanghai Jiao Tong University)
TITLE: Search for solar neutrino and light dark matter with the PandaX-4T experiment
ABSTRACT: The PandaX-4T experiment aims to search for potential dark matter interactions. With significant technical improvements, PandaX-4T achieves unprecedented sensitivity at the low-energy edge of LXe detectors, opening a new window for observing solar neutrinos. Using commissioning data, two hybrid analyses are carried out to search for dark matter interactions, yielding world-leading results for neutrino-nucleus coherent elastic scattering from solar B8 neutrino, as well as for dark matter interactions with nucleons and electrons. These results demonstrate PandaX-4T’s unique capability to search for low-energy interactions from solar and galactic sources.
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Meeting ID: 950 1669 6011
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Speaker: Naim Göksel Karaçaylı (Ohio State University) Title: 1D Lyman-alpha forest power spectrum from the DESI early data
2023-09-08 12:00 - 13:00
DATE: September 8, 2023
TIME: 12:00- 1:00 PM
LOCATION: 50A-5-5132-CR-Sessler
SPEAKER: Naim Göksel Karaçaylı (Ohio State University)
TITLE: 1D Lyman-alpha forest power spectrum from the DESI early data
ABSTRACT: The one-dimensional power spectrum P1D of the Lya forest provides important information including constraints on warm dark matter models, the sum of the neutrino masses, and the thermal state of the intergalactic medium. I will present the first measurement of P1D with the quadratic maximum likelihood estimator (QMLE) applied to 54,600 quasars from DESI early data. Our analysis demonstrates the percent-level performance of the spectroscopic pipeline noise estimation and the spectrograph resolution matrix. Even though the pipeline is exceptional, noise calibration and spectrograph resolution remain as major sources of systematics.
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NO INPA SEMINAR TALK
2023-09-01 12:00 - 13:00

NO INPA
2023-08-18 12:00 - 13:00, 2023-07-28 12:00 - 13:00

Speaker: Damian Goeldi (ETH Zurich)- TITLE: Testing weak equivalence with the LEMING experiment
2023-08-11 12:00 - 13:00
DATE: August 11, 2023
TIME: 12:00- 1:00 PM
SPEAKER: Damian Goeldi (ETH Zurich)
TITLE: Testing weak equivalence with the LEMING experiment
ABSTRACT: The LEMING experiment aims to test weak equivalence in leptonic antimatter. We will employ atomic interferometry to measure the vertical deviation of a horizontal cold muonium (M = μ+ + e−) beam. Existing muonium production schemes are unsuitable for such a precise measurement due to their large velocity and angular spread. To overcome this limitation we have demonstrated a new technique leveraging the chemical potential of superfluid helium (SFHe) to produce a cold muonium beam with a very well defined velocity and angular spectrum. Due to the SFHe our particle detectors need to operate at temperatures below 1K. We have successfully achieved sub-kelvin operation of commercial silicon photomultipliers (SiPMs). Furthermore, a strong background suppression is required in order to reach the intended sensitivity. This can be achieved via a reliable detection of the atomic electron from the muonium, left over after the decay of the antimuon. However, these electrons possess very low energies. Hence, a second detector is required which not only operates below 1K, but also features an energy detection threshold below 1keV. We are currently testing several candidate detectors including perovskite nanocrystals and superconducting nanowires. This talk will give an overview of the LEMING experiment with a focus on the cold muonium beam as well as the cryogenic particle detectors.
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Speaker: Jonathan Echevers (UC Berkeley)- Title: The EXO program: Neutrinoless Double-Beta Decay Searches in Xe-136
2023-08-04 12:00 - 13:00
DATE: August 4, 2023
TIME: 12:00- 1:00 PM
SPEAKER: Jonathan Echevers (UC Berkeley)- Title: The EXO program: Neutrinoless Double-Beta Decay Searches in Xe-136
TITLE: The EXO program: Neutrinoless Double-Beta Decay Searches in Xe-136
ABSTRACT: Neutrinoless double beta (0vBB) decay is currently one of the most compelling searches in nuclear and particle physics. If found, it would imply the existence of Majorana fermions and lepton number violation, both new physics beyond the Standard Model. The EXO-200 experiment consisted of a time projection chamber (TPC) with 200 kg of enriched liquid xenon (LXe), optimized to search for 0vBB of Xe-136. Data acquisition took place from 2011 to the end of 2018, with a total exposure of 234.1kg yr. We found no statistically significant evidence for 0vBB, leading to a lower limit on the half-life of 3.5×10^25 yr at the 90% confidence level (CL). The ultra-low background necessary for this search also provides a unique opportunity to probe other exotic processes, such as Lorentz violation in double-beta decay, electron recoils from dark matter, Majoron emitting modes of double-beta decay, and others. The first part of this talk will focus on the EXO-200 experiment and recent results for exotic-physics searches using this detector. In the second half of this presentation I will discuss the next generation experiment, nEXO, a 5 tonne LXe TPC with a projected 0vBB half-life sensitivity of 1.35×10^28 yr at the 90% CL in 10 years of data-taking.
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NO INPA TODAY
2023-07-21 12:00 - 13:00, 2023-07-14 12:00 - 13:00

Speaker: Barbara Skrzypek (Harvard)- Title: Ice-Breaking Neutrino Energies: Astrophysical Messengers of Planck-Scale Physics​
2023-07-07 12:00 - 13:00
This is an In-Person [HYBRID] Event
Location: Sessler CR, 50A-5132
Date: July 7, 2023
Time: 12:00- 1:00 PM
Speaker: Barbara Skrzypek( Harvard)
Title: Ice-Breaking Neutrino Energies: Astrophysical Messengers of Planck-Scale Physics​
Abstract: ​In recent decades, particle physics has made significant advances in our understanding of high-energy phenomena, both on theoretical and experimental fronts, culminating in the current Standard Model (SM) of particle physics. However, the SM is not a self-contained theory and leaves many questions unanswered; in particular, it falls short of incorporating dark matter or gravitational forces. Among the implications for this is that, beyond the quantum gravity scale, we expect the SM to be replaced with a more fundamental theory giving a quantum description of gravity. As such, effective theories that arise from this fundamental theory can break certain symmetries that normally hold in the SM, such as Lorentz- and CPT-invariance . As a result of this, we expect there to be observables that exhibit low-energy manifestations of these symmetry violations, and in turn, this could have implications for neutrinos and other astrophysical messengers. In this talk, I give an overview of work that I have done in theory, phenomenology, and experimental high-energy physics in the area of effective theories of high-energy phenomena. In an effort to characterize the astrophysical neutrinos that IceCube has observed, I discuss what we can learn about the physics that happens between the production of astrophysical particles and their subsequent detection.
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Speaker: Konrad P. Nesteruk (Harvard)- Title: The Power of Protons: Unleashing Precision in Cancer Treatment
2023-06-30 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler CR, 50A-5132
DATE: June 30, 2023
TIME: 12:00- 1:00 PM
SPEAKER: Konrad P. Nesteruk, Ph.D. (Massachusetts General Hospital and Harvard Medical School)
TITLE: The Power of Protons: Unleashing Precision in Cancer Treatment
ABSTRACT: This seminar will provide a comprehensive overview of proton therapy, focusing on its advantages over conventional radiotherapy, the key components of a proton therapy facility, and the intricate process of precise dose delivery. Additionally, we will explore selected current research areas and potential future innovations, including compact and cost-effective systems, faster treatment delivery, image guidance, and ultra-high dose rate (FLASH) therapy.
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Meeting ID: 950 1669 6011
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Speaker: Ben Smithers (UTA)- Title: A Multi-Channel Search for Signatures of eV-Scale Sterile Neutrinos in IceCube
2023-06-16 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler CR, 50A-5132
DATE: June 16, 2023
TIME: 12:00- 1:00 PM
TITLE: A Multi-Channel Search for Signatures of eV-Scale Sterile Neutrinos in IceCube
ABSTRACT: The IceCube Neutrino Observatory is a cubic-kilometer-scale neutrino observatory built using a gigaton of instrumented ice near the Amundsen–Scott South Pole Station in Antarctica; it measures the Cherenkov light emitted by the daughter particles of neutrino-nucleon interactions occurring inside and around the detector from neutrinos of both astrophysical and atmospheric origin. For eV2-scale sterile neutrino models, matter-effects can yield resonant $bar{
u}_{mu}tobar{
u}_{s}$ oscillations for TeV-scale up-going neutrinos. For certain combinations of mixing angles, this is also expected to yield resonant $bar{
u}_{mu}tobar{
u}_{tau}$ oscillations at the same energies and zeniths as the $
u_{mu}$ disappearance. This superimposed $
u_{mu}$ disappearance and $
u_{tau}$ appearance presents itself as an ideal signature with which we can search for indications of sterile neutrino oscillations. Here, we discuss a multi-channel analysis searching for signs of both resonant muon neutrino disappearance as well as tau neutrino appearance.
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Speaker: Brendan Crill (Jet Propulsion Laboratory, California Institute of Technology) Title: SPHEREx: NASA's all-sky near-infrared spectral survey
2023-06-09 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: INPA Common Room – 50- 5026
DATE: June 9, 2023
TIME: 12:00- 1:00 PM
TITLE: SPHEREx: NASA’s all-sky near-infrared spectral survey
ABSTRACT: SPHEREx is a NASA Astrophysics Explorer mission to produce a near-infrared all-sky spectrophotometric survey. The 2-year mission will measure spectra of every 6-arcsecond pixel on the sky between 0.75 and 5 microns at spectral resolution varying between R=35 and 130. SPHEREx’s instrument is based on a 30-cm off-axis telescope feeding six Teledyne H2RG detectors behind linear variable filters. The mission is optimized to address three science themes: 1. Inflation in the early Universe through large scale structure, 2. the history of galaxy formation by measuring spectra of the extragalactic background fluctuations, and 3. the inventory of biogenic ices in our own Galaxy by surveying ice spectral absorption features towards stars. This talk will describe the unique instrument and survey, and address prospects for constraints on inflationary cosmology through a 3D galaxy redshift survey with the SPHEREx data.
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[SPECIAL] Speaker: Roohi Dalal (Princeton University)- Title: Cosmology and Systematics from Hyper Suprime-Cam Year 3 Data
2023-06-02 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room 50A-5132
DATE: June 2, 2023
TIME: 12:00- 1:00 PM
TITLE: Cosmology and Systematics from Hyper Suprime-Cam Year 3 Data
ABSTRACT: The Hyper Suprime-Cam (HSC) survey is the deepest Stage III weak lensing experiment, going to ~26 mag with exquisite seeing. The depth and image quality achieved by HSC allow us to probe cosmology using weak lensing upto high redshifts, and these analyses serve as important preparatory studies for the next generation of weak lensing surveys. I will discuss our constraints on cosmological parameters using weak lensing cosmic shear power spectra measured from the Year 3 shear catalog of HSC, covering 416 square degrees of the northern sky. After giving a brief overview of our cosmological analysis, and our new constraint on the S8 parameter, I will focus on systematics that have been important and distinguishing factors in our analysis, including photometric redshift uncertainties, systematics from higher order PSF moments, and uncertainties in the modeling of baryonic feedback. I will show that we have made a number of conservative choices to ensure that our analysis is robust to these systematics and share some lessons learned that will enable future surveys to hopefully no longer be limited by such systematics.
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Speaker: Raquel Castillo Fernandez (University of Texas Arlington)- Title: In the hunt for 0νββ at the NEXT experiment
2023-05-12 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room – 50A – 5132
DATE: May 12, 2023
TIME: 12:00- 1:00 PM
TITLE: In the hunt for 0νββ at the NEXT experiment
ABSTRACT: In the last decades, oscillation experiments have demonstrated that neutrinos are not massless particles, and the lepton number is not conserved. Thus, revealing the nature of neutrino masses is one of the major goals in particle physics, and the observation of the neutrinoless double beta decay (0νββ) has been identified as the most practical way to establish that neutrinos are Majorana particles, that is, fermions equivalent to their antiparticles. However, 0νββ, which would violate the lepton number by two units, has not been observed yet and the best limits to the half-life of this process exceed 10ˆ26 yr. An extraordinary effort by several experimental collaborations is ongoing to achieve this ambitious goal and to explore the possibilities to understand the underlying physics of this process, among them, the NEXT experiment aims at the competitive search for the 0νββ decay in 136Xe using high-pressure gas electroluminescent time projection chambers (TPCs). In this talk, I will discuss the status of the current prototypes that are under installation, NEXT-100 and NEXT-CRAB, and some of the main challenges and virtues of the 0νββ search.
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Speaker: Antoine Armatol-Title:Investigation of the Majorana nature of neutrinos at a few meV level of the neutrino mass scale: from CUPID to BINGO
2023-05-05 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room – 50A – 5132
DATE: May 5, 2023
TIME: 12:00- 1:00 PM
TITLE: Investigation of the Majorana nature of neutrinos at a few meV level of the neutrino mass scale: from CUPID to BINGO
ABSTRACT: The search for neutrinoless double beta decay (0ν2β) is one of the biggest experimental challenges of contemporary physics. Its discovery would be ground- breaking since it would prove the Majorana nature of neutrinos, give an insight into neutrino mass scale, and provide clues to explain the matter/antimatter asymmetry of our Universe. Cryogenic calorimeters are promising devices for this purpose as CUORE, the ton-scale experiment constructed with such detectors, is demonstrating by setting the most stringent limit on Te-130 0ν2β half-life and being one of the most sensitive current generation experiments. However, its sensitivity is limited by the background. Its successor, the next-generation experiment CUPID, will reach a higher sensitivity by reducing the number of expected background events in the region of interest. It will study as the candidate isotope Mo-100 embedded inside Li2MoO4 scintillating crystals, which allows mitigating the Ɣ background naturally while also introducing a dual heat/light readout using an auxiliary Ge bolometer to get rid of the α background. Thanks to that, CUPID will improve the CUORE sensitivity by two orders of magnitude. At that point, if 0ν2β still eludes us, the background reduction must be pushed even further. BINGO is a project aiming to prepare the next-next generation of bolometric experiments by proposing innovations and methods for that purpose. For example, it will reduce the remaining Ɣ and β background contributions thanks to respectively a cryogenic active veto and a revolutionary detector assembly. BINGO will demonstrate that, once implemented in a ton-scale isotope experiment, its improvements will allow the latter to reach a sensitivity to neutrino mass scale below 10 meV. In that talk, the current status of the CUPID experiment will be discussed and the R&D work done in the framework of the BINGO project will be presented.
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NO INPA SEMINAR TODAY
2023-04-28 12:00 - 13:00, 2023-04-21 12:00 - 13:00

SPEAKER: Prof. Christian Weinheimer (University of Münster)-TITLE: The dark matter experiment XENONnT and first WIMP results
2023-04-14 12:00 - 13:00
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room – 50A – 5132
DATE: April 14, 2023
TIME: 12:00- 1:00 PM
TITLE: The dark matter experiment XENONnT and first WIMP results
ABSTRACT: Evidence for about 6 times more matter in the universe than normal
matter is coming from cosmological observations and analyses on all
scales. What this exotic dark matter is remains still a secret.
The direct search experiment for dark matter XENONnT located at the
Italian underground laboratory LNGS is looking for weakly interacting
massive particles (WIMPs) and other rare event physics. As an upgrade of
the previous experiment XENON1T it uses a dual-phase time projection
chamber with a total mass of 8.5t of liquid xenon. The recent electron
recoil data from a 1.16 t*yr exposure of XENONnT allowed to set
stringent limits on solar axions, an enhanced neutrino magnetic moment
and bosonic dark matter. XENONnT’s unprecedented low background
originates from very careful material selecting and screening as well as
from active removal of Kr-85 and Rn-222 by cryogenic distillation. This
low background rate allows for a rich physics search program with
XENONnT with WIMPs being the main objective.
In this talk the status of the XENONnt experiment and its first WIMP
search results from a blind analysis in an energy range between 3.1 keV
and 60.0 keV and an exposure of approximately 1.1 tonne-year is presented.”
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SPEAKER: Lisa Schlueter (TU Munich)-TITLE: Neutrino-Mass Analysis with sub-eV Sensitivity and Search for Light Sterile Neutrinos with the KATRIN Experiment
2023-04-11 12:00 - 13:00
SPECIAL INPA SEMINAR
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room – 50A – 5132
DATE: April 11, 2023
TIME: 12:00 pm
TITLE: Neutrino-Mass Analysis with sub-eV Sensitivity and Search for Light Sterile Neutrinos with the KATRIN Experiment
ABSTRACT: The KArlsruhe TRItium Neutrino (KATRIN) experiment is designed to determine the effective mass of the electron-antineutrino with a target sensitivity of 200 meV/c2 (90% C.L.) in a direct and model-independent way. KATRIN uses a strong gaseous windowless Tritium source associated with a large high-resolution spectrometer (MAC-E filter) to analyze precisely the electron energies from the source. The neutrino mass can be inferred from the shape of the tritium β-decay spectrum in the endpoint region. After global commissioning of the apparatus with Tritium in 2018, KATRIN started its first neutrino mass measurement campaign in spring 2019. This talk presents the data and the analysis of the first two measurement campaigns. In terms of effective electron antineutrino mass, an upper limit of 0.8 eV (90% C.L.) could be inferred, reaching for the first time into the sub-eV regime. Moreover, to exploit the full physics potential of the KATRIN experiment, a search for light sterile neutrinos was conducted. As no sterile-neutrino signal is observed, exclusion contours are drawn at 95% C.L. covering the parameter space of the long-persisting light-sterile neutrino anomalies to a great extent.
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Speaker: Gabriela Rodrigues Araujo (University of Zurich)- Title: Light-sheet microscopy of color centers: A new venue for neutrino and dark matter detection with passive crystals
2023-04-10 16:00 - 17:00
SPECIAL INPA SEMINAR
This is an In-Person [HYBRID] Event
LOCATION: Sessler Conference Room – 50A – 5132
DATE: April 10, 2023
TIME: 4:00 pm
TITLE: Light-sheet microscopy of color centers: A new venue for neutrino and dark matter detection with passive crystals
ABSTRACT: Most of the techniques currently used to detect nuclear recoils from dark matter and neutrinos rely on the collection of charge, prompt scintillation photons or phonons. In this talk, I will discuss a new approach: The use of light-sheet fluorescence microscopy to detect a specific type of crystal defect, so called color centers (CCs), which could be induced by nuclear recoils in solid-state materials. Since CCs require little energy to form (10-50 eV), the proposed detectors can search for particle interactions at unexplored low-energy regions. Despite the nm-size of these defects, excited CCs re-emit color in the visible range, a feature that facilitates their detection. To make this detection channel competitive for rare-event search, a fast imaging method of single CCs is necessary. The PALEOCCENE collaboration works towards this goal: a scalable read-out of CCs for passive detectors of neutrinos and dark matter. In the talk I will discuss the concept, the current R&D and possible applications for dark matter, CEvNS, and nuclear-nonproliferation safeguards.
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Meeting ID: 950 1669 6011

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