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Low Energy Backgrounds in Dark Matter Direct Detection Experiments
Low Energy Backgrounds in Dark Matter Direct Detection Experiments
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103608
- ISBN
- 9798288865701
- DDC
- 593.7
- 서명/저자
- Low Energy Backgrounds in Dark Matter Direct Detection Experiments
- 발행사항
- [Sl] : University of California, Berkeley, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 223 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: McKinsey, Daniel.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2025.
- 초록/해제
- 요약Identifying the particle nature of dark matter remains one of the most pressing problems in modern physics, with a wide variety of candidates potentially comprising the universe's "missing mass.'' New theoretical paradigms combined with improving experimental capabilities have drawn attention to the possibility that dark matter has a mass in the MeV to GeV range, much lighter than traditional "WIMP'' candidates. While modern solid state calorimeters are beginning to be sensitive to these light dark matter candidates, a new class of low energy backgrounds, often called the "Low Energy Excess'' (LEE) has severely limited the ability of these detectors to search for light dark matter candidates. Nearly a decade after discovery, the origin of these LEE backgrounds remains illusive.In this thesis, I show progress towards understanding the origin of these backgrounds. First, I show work which demonstrates that while the mechanical stress induced in a detector through its holding can create LEE-type backgrounds, it is unlikely that these backgrounds dominate currently world leading experiments. Next, I give a model of these remaining low energy events based on the relaxation of thermally stressed aluminum films, before showing experimental evidence which indicates these events are not the majority of the phonon-coupled LEE background in leading dark matter experiments. Evidence from a two channel athermal phonon detector indicates that a LEE background coupled strongly to the detector's phonon sensors does originate within these sensor's aluminum films ("singles LEE''), however, these LEE events can be easily discriminated from phonon-coupled LEE which seems to originate from the detector's substrate. Finally, I show a world leading dark matter search using this two channel detector, using the two channel readout to cut "singles'' LEE backgrounds.
- 일반주제명
- Particle physics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Low temperature physics
- 키워드
- Calorimeter
- 키워드
- Phonon
- 기타저자
- University of California, Berkeley Physics
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103608
■006m o d
■007cr#unu||||||||
■020 ▼a9798288865701
■035 ▼a(MiAaPQ)AAI32042956
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a593.7
■1001 ▼aRomani, Roger Kenneth.
■24510▼aLow Energy Backgrounds in Dark Matter Direct Detection Experiments
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a223 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: McKinsey, Daniel.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2025.
■520 ▼aIdentifying the particle nature of dark matter remains one of the most pressing problems in modern physics, with a wide variety of candidates potentially comprising the universe's "missing mass.'' New theoretical paradigms combined with improving experimental capabilities have drawn attention to the possibility that dark matter has a mass in the MeV to GeV range, much lighter than traditional "WIMP'' candidates. While modern solid state calorimeters are beginning to be sensitive to these light dark matter candidates, a new class of low energy backgrounds, often called the "Low Energy Excess'' (LEE) has severely limited the ability of these detectors to search for light dark matter candidates. Nearly a decade after discovery, the origin of these LEE backgrounds remains illusive.In this thesis, I show progress towards understanding the origin of these backgrounds. First, I show work which demonstrates that while the mechanical stress induced in a detector through its holding can create LEE-type backgrounds, it is unlikely that these backgrounds dominate currently world leading experiments. Next, I give a model of these remaining low energy events based on the relaxation of thermally stressed aluminum films, before showing experimental evidence which indicates these events are not the majority of the phonon-coupled LEE background in leading dark matter experiments. Evidence from a two channel athermal phonon detector indicates that a LEE background coupled strongly to the detector's phonon sensors does originate within these sensor's aluminum films ("singles LEE''), however, these LEE events can be easily discriminated from phonon-coupled LEE which seems to originate from the detector's substrate. Finally, I show a world leading dark matter search using this two channel detector, using the two channel readout to cut "singles'' LEE backgrounds.
■590 ▼aSchool code: 0028.
■650 4▼aParticle physics
■650 4▼aCondensed matter physics
■650 4▼aLow temperature physics
■653 ▼aAluminum relaxation
■653 ▼aCalorimeter
■653 ▼aDark matter detector
■653 ▼aLow Energy Excess
■653 ▼aPhonon
■690 ▼a0798
■690 ▼a0611
■690 ▼a0598
■71020▼aUniversity of California, Berkeley▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357844▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
