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Multicomponent registration of the EAS
M.B. Amelchakov, N.S. Barbashina, A.G. Bogdanov, A. Chiavassa,
D.M. Gromushkin, S.S. Khokhlov, R.P. Kokoulin, K.G. Kompaniets, O.I. Likiy,
A.A. Petrukhin, I.A. Shulzhenko, V.V. Shutenko, I.I. Yashin, K.O. Yurin,
E.A. Zadeba
National Research Nuclear University MEPhI
(Moscow Engineering Physics Institute)
July 6-10, 2018 Barnaul-Belokurikha
Introduction
2
The report is concerned with the only 5 setups operation
in the period of work 29.12.2017 08.02.2018
The Experimental complex NEVOD is a multipurpose
facility for EAS investigation. It includes detectors for
registration of:
- electron-photon component;
- muon component;
- hadron component:
- EAS core energy deposition
3
Experimental complex NEVOD
DECOR
supermodules
Cherenkov Water
Detector (CWD)
Calibration Telescope
System (CTS) CWD:
2000 m3
91 QSM
546 PMTs
CTS:
2 × 40 counters
Sd = 800 cm2
Thickness=2 cm
Area = 8 × 10 m2
DECOR:
Total area ~ 70 m2
accuracy better than:
1 cm and 1 degree
4
Experimental complex NEVOD
PRISMA-32:
32 en-detectors
Sd = 0.36 m2
Thickness = 30 mg/cm2
Area = 18 × 30 m2
Experimental complex NEVOD
Array for EAS registration (NEVOD-EAS)
5
Clusters
6
The event selections
Four setups inside the Exsperimental complex building are combined by
the single trigger system. For selection of NEVOD-EAS events
coincidences in time are used.
We selected the events when the delay time between trigger system and 3d
cluster of NEVOD-EAS is in the range [-700, 0] ns.
-700 -600 -500 -400 -300 -200 -100 0
100
101
102
103
No. e
ve
nts
Time delay (t), ns
<t> = -383.9 0.3 ns
t = 27.4 0.3 ns
Joint event 1
7
Joint event 2
8
Joint event 3
9
EAS direction reconstruction by electron and muon components
10
Distributions of the differences between the values of the projection zenith angles x and y
Distributions of the number of events per unit solid angle
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 300
100
200
300
400
500
600
700 NEVOD-EAS vs DECOR
<x> = -0.71° ± 0.06°
x= 2.60° ± 0.11°
x = (
x NEVOD-EAS -
x DECOR) , degree
No. events
3 Cluster vs DECOR
<x> = -0.19° ± 0.06°
x= 2.48° ± 0.12°
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 300
100
200
300
400
500
600
700
800
NEVOD-EAS vs DECOR
<y> = 0.09° ± 0.05°
y= 2.05° ± 0.11°
3 Cluster vs DECOR
<y> = 0.18° ± 0.04°
y= 1.89° ± 0.08°
y = (
y NEVOD-EAS -
y DECOR) , degree
No. events
0 2 4 6 8 10 12 14 16 180
500
1000
1500
2000
2500
3000
3500
4000
, degree
dN
/dsr-1
3 Cluster vs DECOR
<> = 1.76°
= 2.01°
NEVOD-EAS vs DECOR
<> = 1.91°
= 2.04°
EAS electron component
11
Electron density spectra obtained with three setups
10-2
10-1
100
101
102
103
104
100
101
102
103
104
~ 1.3
No. e
ve
nts
e, m
-2
CTS
Cluster #3
PRISMA
EAS hadron component
neutron spectrum PRISMA-32 vs Cluster #3
(neutrons vs electrons)
12
0 5 10 15 20 25 30 35 4010
0
101
102
103
No
. e
ve
nts
No. neutrons
~ 3.4
100
101
102
103
10-2
10-1
100
101
102
R 5.0
R 15.0
R 25.0
R 35.0
R 45.0
Nu
m.
of
ne
utr
on
s
e(Cl #3), m
-2
CWD response
13
Spectrum of photo-electron number in CWD as a result of joint events processing
101
102
103
104
105
106
107
108
100
101
102
103
104
105
No
. e
ve
nts
No. p.e.
~ 0.9
14
Conclusion
In the MEPhI we have the Experimental complex with five different setups
which are able to work in a wide energy range of primary CR and to solve
many different tasks in modern physics like:
1. Investigation EAS in energy range from 1 to 100 PeV.
2. Investigation the nature of the knee in the energy spectrum of the
primary CR.
3. Study of the background of the thermal neutrons.
4. Checking models of particles interactions at ultrahigh energies.
5. Research of the anisotropy and local sources of the primary CR.
and so on…
15
Thank you for your attention
EAS electron & muon component
16
Distribution of hit counter multiplicity in top and bottom CTS planes
These distributions are the basis for reconstruction of local charge
particles density
1010
-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
~m-3.76
40
Bottom plane
Rate
, s
-1
Multiplicity [m]
Top plane
2
~m-2.71
