skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Observation of muon intensity variations by season with the MINOS near detector

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1159707
Report Number(s):
BNL-106103-2014-JA
R&D Project: PO-022; KA2201020
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 90; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; near; detector; muon

Citation Formats

Adamson P., Bishai M., Diwan, M.V., Isvan, Z., Ling, J., and Viren, B., Whitehead, L.. Observation of muon intensity variations by season with the MINOS near detector. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.012010.
Adamson P., Bishai M., Diwan, M.V., Isvan, Z., Ling, J., & Viren, B., Whitehead, L.. Observation of muon intensity variations by season with the MINOS near detector. United States. doi:10.1103/PhysRevD.90.012010.
Adamson P., Bishai M., Diwan, M.V., Isvan, Z., Ling, J., and Viren, B., Whitehead, L.. Tue . "Observation of muon intensity variations by season with the MINOS near detector". United States. doi:10.1103/PhysRevD.90.012010.
@article{osti_1159707,
title = {Observation of muon intensity variations by season with the MINOS near detector},
author = {Adamson P. and Bishai M. and Diwan, M.V. and Isvan, Z. and Ling, J. and Viren, B., Whitehead, L.},
abstractNote = {},
doi = {10.1103/PhysRevD.90.012010},
journal = {Physical Review D},
number = 1,
volume = 90,
place = {United States},
year = {Tue Jul 22 00:00:00 EDT 2014},
month = {Tue Jul 22 00:00:00 EDT 2014}
}
  • A sample of 1.53more » $$\times$$10$$^{9}$$ cosmic-ray-induced single muon events has been recorded at 225 meters-water-equivalent using the MINOS Near Detector. The underground muon rate is observed to be highly correlated with the effective atmospheric temperature. The coefficient $$\alpha_{T}$$, relating the change in the muon rate to the change in the vertical effective temperature, is determined to be 0.428$$\pm$$0.003(stat.)$$\pm$$0.059(syst.). An alternative description is provided by the weighted effective temperature, introduced to account for the differences in the temperature profile and muon flux as a function of zenith angle. Using the latter estimation of temperature, the coefficient is determined to be 0.352$$\pm$$0.003(stat.)$$\pm$$0.046(syst.).« less
  • The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected deep underground. The MINOS far detector at Soudan MN, USA, has collected over 67 million cosmic ray induced muons. The underground muon rate measured over a period of five years exhibits a 4% peak-to-peak seasonal variation which is highly correlated with the temperature in the upper atmosphere. The coefficient, {alpha}{sub T}, relating changes in the muon rate to changes in atmospheric temperature was found to be: {alpha}{sub T} = 0.874 {+-} 0.009 (stat.) {+-} 0.010more » $$ (syst.). Pions and kaons in the primary hadronic interactions of cosmic rays in the atmosphere contribute differently to {alpha}{sub T} due to the different masses and lifetimes. This allows the measured value of {alpha}{sub T} to be interpreted as a measurement of the K{pi} ratio for E{sub p}/unit[7](TeV) of $$0.13 {+-} 0.08, consistent with the expectation from collider experiments.« less
  • The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected underground.
  • The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected deep underground. The MINOS far detector at Soudan, MN, has collected over 67x10{sup 6} cosmic ray induced muons. The underground muon rate measured over a period of five years exhibits a 4% peak-to-peak seasonal variation which is highly correlated with the temperature in the upper atmosphere. The coefficient, {alpha}{sub T}, relating changes in the muon rate to changes in atmospheric temperature was found to be {alpha}{sub T}=0.873{+-}0.009(stat){+-}0.010(syst). Pions and kaons in the primary hadronicmore » interactions of cosmic rays in the atmosphere contribute differently to {alpha}{sub T} due to the different masses and lifetimes. This allows the measured value of {alpha}{sub T} to be interpreted as a measurement of the K/{pi} ratio for E{sub p} > or approx. 7 TeV of 0.12{sub -0.05}{sup +0.07}, consistent with the expectation from collider experiments.« less
  • We report the first observation of seasonal modulations in the rates of cosmic ray multiple-muon events at two underground sites, the MINOS Near Detector with an overburden of 225 mwe, and the MINOS Far Detector site at 2100 mwe. Thus, at the deeper site, multiple-muon events with muons separated by more than 8 m exhibit a seasonal rate that peaks during the summer, similar to that of single-muon events. In contrast and unexpectedly, the rate of multiple-muon events with muons separated by less than 5–8 m, and the rate of multiple-muon events in the smaller, shallower Near Detector, exhibit amore » seasonal rate modulation that peaks in the winter.« less