WIMP detection and slow ion dynamics in carbon nanotube arrays

被引:30
作者
Cavoto, G. [1 ]
Cirillo, E. N. M. [2 ]
Cocina, F. [3 ]
Ferretti, J. [3 ,4 ]
Polosa, A. D. [3 ,4 ,5 ]
机构
[1] Ist Nazl Fis Nucl, Sez Roma, Piazzale A Moro 2, I-00185 Rome, Italy
[2] Sapienza Univ Roma, Dipartimento SBAI, Via A Scarpa 16, I-00161 Rome, Italy
[3] Sapienza Univ Roma, Dipartimento Fis, Piazzale A Moro 2, I-00185 Rome, Italy
[4] Sapienza Univ Roma, INFN, Piazzale A Moro 2, I-00185 Rome, Italy
[5] CERN, Div Theory, CH-1211 Geneva, Switzerland
来源
EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 06期
关键词
DARK-MATTER DETECTOR; MULTIPLE-SCATTERING; SEARCH; PARTICLES; ENERGY; DAMA/NAI; SIGNALS; LIMITS; RUN;
D O I
10.1140/epjc/s10052-016-4193-7
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Large arrays of aligned carbon nanotubes (CNTs), open at one end, could be used as target material for the directional detection of weakly interacting dark matter particles (WIMPs). As a result of a WIMP elastic scattering on a CNT, a carbon ion might be injected in the body of the array and propagate through multiple collisions within the lattice. The ion may eventually emerge from the surface with open end CNTs, provided that its longitudinal momentum is large enough to compensate energy losses and its transverse momentum approaches the channeling conditions in a single CNT. Therefore, the angle formed between the WIMP wind apparent orientation and the direction of parallel carbon nanotube axes must be properly chosen. We focus on very low ion recoil kinetic energies, related to low mass WIMPs (approximate to 11 GeV) where most of the existing experiments have low sensitivity. Relying on some exact results on two-dimensional lattices of circular obstacles, we study the low energy ion motion in the transverse plane with respect to CNT directions. New constraints are obtained on how to devise the CNT arrays to maximize the target channeling efficiency.
引用
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页数:11
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