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Blocking effect in CsI(Tl) crystal by neutron

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dc.contributor.advisor최선호-
dc.contributor.author주한울-
dc.date.accessioned2017-07-19T09:16:44Z-
dc.date.available2017-07-19T09:16:44Z-
dc.date.issued2013-08-
dc.identifier.other000000013711-
dc.identifier.urihttps://hdl.handle.net/10371/131688-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 물리·천문학부(물리학전공), 2013. 8. 최선호.-
dc.description.abstractTo detect WIMP directly, which is strong candidate for dark matter, KIMS
collaboration used CsI(Tl) crystal as a scintillation detector. To increase the
detector`s sensitivity, we studied channeling and blocking effect in the
CsI(Tl) crystal, which refer to the orientation dependence of charged ion`s
penetration in crystals. It results in modulation of scintillation or ionization
yield in the CsI(Tl) crystal.
In order to measure the channeling and blocking effect in CsI(Tl) crystal,
we used a CsI(Tl) crystal, a neutron generator, and three neutron detectors,
with making the directions of recoil ions induced by the neutron-nucleus
scatterings to be aligned along one of the symmetry axis or plane in the
CsI(Tl) crystal. Also, we did simulations to compare their results with the
data obtained from our experimental setup, by two kinds of computer
simulations, MARLOWE and Geant4. To confirm the affection of the
blocking effect in the CsI(Tl) crystal, we compared the light yields of recoil
ions moving along the symmetry axis, [110], and those of recoil ions
moving along random directions, and compared mean decay time of signals
from each recoil direction. By comparing those from experiments and
simulations, we could find a clue for the blocking effect which is expected
to result in less scintillation light yields.
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dc.description.tableofcontents1 Introduction 1
1.1. CsI(Tl) crystal as a dark matter detector . . . . . . . . . . . . . . . . . . 1
1.2. Channeling and Blocking Effect on the CsI(Tl) crystal . . . . . . 3
1.3. Daily and Annual modulation for WIMP research . . . . . . . . . . 5
1.4. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Experiment 7
2.1. Goal of this experiment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2. Experimental Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1. Neutron Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.2. CsI(Tl) crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.3. Neutron Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3. DAQ and event selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Simulation 19
3.1. MARLOWE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2. Geant4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4 Data Analysis & result 26
5 Conclusion 37
Bibliography 39
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dc.formatapplication/pdf-
dc.format.extent1371109 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectDark matter-
dc.subjectWIMPs-
dc.subjectKIMS-
dc.subjectCsI(Tl) crystal-
dc.subjectChanneling effect-
dc.subjectBlocking effect-
dc.subject.ddc523-
dc.titleBlocking effect in CsI(Tl) crystal by neutron-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pagesiv, 40-
dc.contributor.affiliation자연과학대학 물리·천문학부(물리학전공)-
dc.date.awarded2013-08-
Appears in Collections:
College of Natural Sciences (자연과학대학)Dept. of Physics and Astronomy (물리·천문학부)Physics (물리학전공)Theses (Master's Degree_물리학전공)
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