کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8165897 | 1526221 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nuclear-recoil energy scale in CDMS II silicon dark-matter detectors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The Cryogenic Dark Matter Search (CDMSÂ II) experiment aims to detect dark matter particles that elastically scatter from nuclei in semiconductor detectors. The resulting nuclear-recoil energy depositions are detected by ionization and phonon sensors. Neutrons produce a similar spectrum of low-energy nuclear recoils in such detectors, while most other backgrounds produce electron recoils. The absolute energy scale for nuclear recoils is necessary to interpret results correctly. The energy scale can be determined in CDMSÂ II silicon detectors using neutrons incident from a broad-spectrum 252Cf source, taking advantage of a prominent resonance in the neutron elastic scattering cross section of silicon at a recoil (neutron) energy near 20 (182)Â keV. Results indicate that the phonon collection efficiency for nuclear recoils is 4.8â0.9+0.7% lower than for electron recoils of the same energy. Comparisons of the ionization signals for nuclear recoils to those measured previously by other groups at higher electric fields indicate that the ionization collection efficiency for CDMSÂ II silicon detectors operated at â¼4Â V/cm is consistent with 100% for nuclear recoils below 20Â keV and gradually decreases for larger energies to â¼75% at 100Â keV. The impact of these measurements on previously published CDMSÂ II silicon results is small.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 905, 11 October 2018, Pages 71-81
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 905, 11 October 2018, Pages 71-81
نویسندگان
R. Agnese, A.J. Anderson, T. Aramaki, W. Baker, D. Balakishiyeva, S. Banik, D. Barker, R. Basu Thakur, D.A. Bauer, T. Binder, A. Borgland, M.A. Bowles, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, R. Calkins, C. Cartaro, X. Zhao,