By Holger Kluck
The paintings offered during this e-book is an important step in the direction of realizing and at last suppressing history within the direct look for darkish subject debris scattering off germanium detectors. even supposing the flux of cosmic muons is decreased through many orders of value in underground laboratories, the remainder vigorous muons result in neutrons via a variety of strategies, neutrons which could possibly mimic a gloomy topic sign. This thesis describes the dimension of muon-induced neutrons over greater than three years within the Modane underground laboratory. the information are complemented through an intensive modeling of the neutron sign utilizing the GEANT4 simulation package deal, demonstrating the appropriateness of this instrument to version those infrequent tactics. for that reason, an actual neutron construction yield could be awarded. hence, destiny underground experiments should be in a position to reliably version the predicted cost of muon-induced neutrons, making it attainable to advance the required protective suggestion to suppress this history component.
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Extra resources for Production Yield of Muon-Induced Neutrons in Lead: Measured at the Modane Underground Laboratory
2] 2 Searching Dark Matter: The Quest for the Missing Mass /ns 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 /GeV A thermal relic particle X produced in the early universe, was initially in thermal equilibrium. When the temperature T drops below the particle mass m X , its comoving number density n X becomes Boltzmann suppressed: n X ∼ (m X T /2π)3/2 exp(−m X /T ) [173, 206]. As the Universe expands with the inverse Hubble’s constant 1/H , the particles eventually become chemically decoupled , and they freeze out as their number density approaches a constant relic density [153, 323].
For example, Fig. C. Rubin, N. K. Ford Jr. showed in 1980 by the then largest systematic observation of galactic rotations that the anomalous rotation curves were no exception. Contrary, they found out of 21 spiral galaxies no single one that followed the expected Keplerian behaviour . C. Rubin et al. 4 Albeit J. Einasto, A. Kaasik, and E. Saar provide an earlier fit of a dark halo to a rotation curve in , we chose the example of  for the sake of clarity as it shows the individual components.
120 24. Enss C (ed) (2005) Cryogenic particle detection, vol 99. Topics in applied physics. Springer, Berlin. 1007/b12169 25. Ferrari A et al (2005) FLUKA: a multi-particle transport code. pdf 26. Figueroa-Feliciano E (2011) Direct detection searches for WIMP dark matter. Prog Part Nucl Phys 66(3):661–673. 003 27. Formaggio JA, Martoff CJ (2004) Backgrounds to sensitive experiments underground. Annu Rev Nucl Part Sci 54:361–412. 181248 28. Gaisser TK (1991) Cosmic rays and particle physics. 1. , repr.
Production Yield of Muon-Induced Neutrons in Lead: Measured at the Modane Underground Laboratory by Holger Kluck