Measurement of the energy spectrum of astrophysical muon-neutrinos with the IceCube Observatory
Measurement of the energy spectrum of astrophysical muon-neutrinos with the IceCube Observatory
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用冰立方天文台测量天体物理μ子中微子的能谱
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
C. Wiebusch
中科院分区：
文献类型：
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作者：
J. Stettner;M. Kramer;C. Wiebusch
高能宇宙射线的加速属于基本的
现代物理学的开放性问题为了研究
它背后的机制和天体物理环境
提供了巨大的动力所需的加速，它是
关键是使用补充测量，即调查
不同信使粒子到达地球的流量。以来
他们在2013年首次发现高能天体物理中微子，
作为额外的信使。本论文
测量这些中微子的累积通量，
能谱。
冰立方中微子天文台收集了数据，
它测量了大约一立方公里的
南极深处的冰川使用超过650.000
观测了近十年的μ子轨道事件，
改进的天体物理学μ介子-中微子测量方法
通量已执行：增加的统计相比，
以前的出版物（' 2）和改进的治疗系统
不确定性导致更精确的测量
天体物理通量特性观察到的能量谱可以是
用归一化幂律描述
+<$
@100TeV = 1.36+0.24
-0.25
10-18 GeV ~（-1）cm ~（-2）s ~（-1）Sr ~（-1）和光谱指数
SPL = -2.37+0.08
-0.09.
此外，能量的各种其他参数化
天体物理学中微子的光谱已经被测试，
包括独立于模型的方法，以便于比较
理论预测和其他测量。这些测试
显示了超越单一幂律的光谱特征的第一个提示：
参数化方法能更好地描述实验数据
对于具有变化斜率的天体物理中微子谱，即，
在最高能量处具有更陡的光谱。
The acceleration of high-energetic cosmic rays belongs to the fundamental
open questions of modern physics. In order to study the
mechanisms behind it and the astrophysical environments which
provide the enormous power required for the acceleration, it is
crucial to use complementary measurements, i.e. to investigate the
fluxes of different messenger particles that reach the Earth. Since
their first discovery in 2013, high-energetic astrophysical neutrinos
have been established as additional messengers. In this thesis, a
measurement of the cumulative flux of these neutrinos and of their
energy spectrum is presented.
Data has been collected with the IceCube Neutrino Observatory,
which instruments approximately one cubic kilometer of
glacial ice deep below the South Pole. Using more than 650.000
observed muon-track events from nearly ten years of operation,
an improved measurement of the astrophysical muon-neutrino
flux has been performed: The increased statistics compared to
previous publications (' 2 ) and an improved treatment of systematic
uncertainties lead to a more precise measurement of the
astrophysical flux properties. The observed energy spectrum can be
described by a power-law with normalization
+¯
@100TeV = 1.36+0.24
-0.25
10-18 GeV-1cm-2s-1sr-1 and spectral index
SPL = -2.37+0.08
-0.09.
Additionally, a wide range of other parameterizations for the energy
spectrum of the astrophysical neutrinos have been tested,
including model-independent approaches to enable an easy comparison
to theory predictions and other measurements. These tests
show first hints for spectral features beyond the single power-law:
The experimental data is better described by parameterizations
for the astrophysical neutrino spectrum with a changing slope, i.e.
with a steeper spectrum at highest energies.