Lehrstuhl E15Univ.-Prof. Dr. F. von FeilitzschInstitut fur˜ Astro-Teilchenphysikder Technischen Universit˜at Munc˜ henStudy On Neutron-Induced Background inthe Dark Matter Experiment CRESSTHesti R.T. WulandariVollst˜andiger Abdruck der von der Fakult˜at fur˜ Physik der TechnischenUniversit˜at Munc˜ hen zur Erlangung des akademischen Grades einesDoktors der Naturwissenschaftengenehmigten Dissertation.Vorsitzender: Univ.-Prof. Dr. M. DreesPrufer˜ der Dissertation: 1. Dr. F. von Feilitzsch2. Dr. N. Schmitz, em.Die Dissertation wurde am 13.06.03 bei der Technischen Universit˜at Munc˜ heneingereicht und durch die Fakult˜at fur˜ Physik am 09.07.03 angenommen.To AgengiiiOverviewThere are more things in heaven and on earth, Horatio,than are dreamt of in your philosophy.- Hamlet -The mystery of dark matter dates back to the 1930s, when astronomerFritz Zwicky found that rotation rates of galaxies were much higher thanexpected from their estimated masses. He concluded that the only way toexplain those high rotation rates was that the galaxies were much moremassive than estimated because of the existence of invisible, dark matter(or better: dark component).Today, 70 years after Zwicky’s observation, dark matter remains a mys-tery. A host of observational data suggests and supports its existence. Weare quite sure now, that almost 70% of the dark component is not in theform of matter at all but in the form of so-called dark energy instead.