Kimb Moody
University of Arizona

REU program-Summer 2003
Univ. of Wisconsin - Madison
Madison, WI 53706

kimbquark@amanda.wisc.edu



My Mentor, Paolo Desiati
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National Science Foundation
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The University of Arizona
The University of Wisconsin
Research Picture

MY RESEARCH PROJECT

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Introduction

Located at the geographic South Pole AMANDA is composed of 677 optical modules on 19 strings, arranged cylindrically from 1500 to 2000 meters beneath the icy surface of Antarctica. When particles travel through the arctic ice at velocities greater than that of light in ice, they emit energy in the form of Cerenkov radiation. AMANDA's optical modules ("OMs") detect these Cerenkov photons. The greater the velocity of the incoming particles, the more intense the Cerenkov radiation, and the more optical modules in AMANDA that are "hit." From our data, we are able to reconstruct the path of the incoming muons and their angles of incidence.

AMANDA is a telescope, but not in the typical sense of the word. Instead of gathering optical, infrared, or x-ray light, AMANDA is designed as a "neutrino" telescope. Incoming cosmic rays (consisting primarily of protons) interact with the molecules in the atmosphere to produce D particles, which, in turn, decay into muons and neutrinos. Since neutrinos are extremely difficult to detect directly, we set out to detect the number of muons produced in the atmosphere. Over a broad range of energy, 10 Gev-200 TeV, the number of muons produced is the same as the number of neutrinos produced. Higher energy neutrinos are produced extragalatically from AGN (active galactic nuclei), GRB (Gamma Ray Bursts), and Quasars. These neutrinos have much, much higher energies than the conventional ones produced in the atmosphere. One of the goals of AMANDA is to try to find a flux of high-energy neutrinos. An obstacle arises when sorting through the data: how can one distinguish the lower-energy muons from the higher-energy ones? The goal of my research was to find a method separating the prompt muons from the more abundant conventional (background) muons.

Research Picture

Fig.1 compares minimum bias monte carlo muons with prompts muons.

The research I've conducted this summer compares simulated lower-energy muon and "prompt" muon events with actual experimental events. The models the AMANDA collaboration uses to simulate the lower-energy conventional muons agree very well with experimental data.

Research Picture

Fig.2 compares monte carlo simulated data with experimental data.

The dramatic conclusions of my research project will be presented by the end of July.


My Links

The following links are personal favorites and may or may not be related to physics.

Albert Einstein"One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike - and yet it is the most precious thing we have." (Albert Einstein 1879-1955)

Albert Einstein

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