Multiple Coulomb scattering of muons in lithium hydride
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Multiple Coulomb scattering (MCS) is a well-known phenomenon occurring when charged particles
traverse materials. Measurements of muons traversing low Z materials made in the MuScat experiment
showed that theoretical models and simulation codes, such as GEANT4 (v7.0), over-estimated the scattering.
The Muon Ionization Cooling Experiment (MICE) measured the cooling of a muon beam traversing a
liquid hydrogen or lithium hydride (LiH) energy absorber as part of a programme to develop muon
accelerator facilities, such as a neutrino factory or a muon collider. The energy loss and MCS that occur in
the absorber material are competing effects that alter the performance of the cooling channel. Therefore
measurements of MCS are required in order to validate the simulations used to predict the cooling
performance in future accelerator facilities. We report measurements made in the MICE apparatus of MCS
using a LiH absorber and muons within the momentum range 160 to 245 MeV=c. The measured RMS
scattering width is about 9% smaller than that predicted by the approximate formula proposed by the
Particle Data Group, but within the latter’s stated uncertainty. Data at 172, 200 and 240 MeV=c are
compared to the GEANT4 (v9.6) default scattering model. These measurements show agreement with this
more recent GEANT4 (v9.6) version over the range of incident muon momenta.
traverse materials. Measurements of muons traversing low Z materials made in the MuScat experiment
showed that theoretical models and simulation codes, such as GEANT4 (v7.0), over-estimated the scattering.
The Muon Ionization Cooling Experiment (MICE) measured the cooling of a muon beam traversing a
liquid hydrogen or lithium hydride (LiH) energy absorber as part of a programme to develop muon
accelerator facilities, such as a neutrino factory or a muon collider. The energy loss and MCS that occur in
the absorber material are competing effects that alter the performance of the cooling channel. Therefore
measurements of MCS are required in order to validate the simulations used to predict the cooling
performance in future accelerator facilities. We report measurements made in the MICE apparatus of MCS
using a LiH absorber and muons within the momentum range 160 to 245 MeV=c. The measured RMS
scattering width is about 9% smaller than that predicted by the approximate formula proposed by the
Particle Data Group, but within the latter’s stated uncertainty. Data at 172, 200 and 240 MeV=c are
compared to the GEANT4 (v9.6) default scattering model. These measurements show agreement with this
more recent GEANT4 (v9.6) version over the range of incident muon momenta.
Date Issued
2022-11-01
Date Acceptance
2022-10-27
Citation
Physical Review D: Particles, Fields, Gravitation and Cosmology, 2022, 106 (9)
ISSN
1550-2368
Publisher
American Physical Society
Journal / Book Title
Physical Review D: Particles, Fields, Gravitation and Cosmology
Volume
106
Issue
9
Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
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Identifier
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Subjects
Astronomy & Astrophysics
DESIGN
Physical Sciences
Physics
Physics, Particles & Fields
Science & Technology
Publication Status
Published
Article Number
ARTN 092003
Date Publish Online
2022-11-14