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Cosmic Ray detector

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Anshul Yadav

on 2 July 2013

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Transcript of Cosmic Ray detector


Cloud Chamber?
Experiment 3 :
Cosmic Ray
Exp 2: Count rate vs orientation of box
How is this related to electromagnetism?
Experiments Conducted
Experiment 4 :
Cosmic rays are high energy charged particles, originating in outer space.
Cosmic rays are comprised of 89% hydrogen nuclei, 10% alpha particles and 1 % heavy metal nuclei.
Density of Cosmic Rays

A device which identifies different types of charged particle when they pass through and ionize a super saturated vapor.
Our cloud chamber
Ionization [1]
Cosmic ray entering Earth by Wiki
The magnetic field can be used to determine the charge of a particle!
Cosmic Ray Trails
Straight track 'kinking' off left/right sharply : Muon decay.
Zig zag track : Low energy cosmic ray bouncing from atoms (multiple scattering).
Skinny straight tracks : High energy Muon particles barreling through Detector.
Three tracks meeting at a point : One is cosmic ray, other is outoging electron hit by cosmic ray, last is the outgoing cosmic ray itself.

Objectives of the PROJECT
Particles by Wiki

As per our experiment Count rate of cosmic rays increases at night as compared to day which is in total agreement to expected results.
According to Blackett, pressure level in the atmosphere, where most of the muons are formed, increases as the atmospheric temperature increases .consequently more muons decay before reaching the ground
To build a detector that is easy to build, cheap and has some kind of usable output to graph, visualize etc
To study influence of magnetic field on cosmic rays, their count rate dependence and their density in our cloud chamber.on time of day,orientation
1) Effect of magnetic field on cosmic ray.
2) Count rate v/s orientation of the cloud chamber.
3) Count rate v/s time of day (day & night
4) Count rate per unit volume per unit time

As per the our experiments the count rate of cosmic rays are MORE in N-S direction than in the E-W direction.
It is in agreement to earlier experiments carried out by various research institutes.
As per a research in Tasmania the ratio was 0.272 in N-S direction and 0.212 in E-W direction.
Results Obtained : DAY
Event 1)
Time of Observation : 3 min
Rays witnessed : 30
Event 2)
Time of observation : 2 min 30 sec
Rays witnessed : 25
Event 3)
Time of observation :3 min 10 sec
Rays witnessed : 32

Results Obtained : night
Event 1)
Time of Observation : 2 min 45 sec
Rays witnessed : 28
Event 2)
Time of observation : 3 min 22 sec
Rays witnessed : 37
Event 3)
Time of observation :2 min 34 sec
Rays witnessed : 32

Results obtained : North South
Event 1)
Time of observation : 2 min 45 sec
Rays Seen: 28

Event 2)
Time of observation : 3 min 10 sec
Rays seen: 32
Results Obtained : East West
Event 1)
Time of observation : 2 min 40sec
Rays witness: 21

Event 2)
Time of observation: 3 min 7 sec
Rays witness: 25
The effective Volume of the box:
6"x6"x6" i.e. 3456.6 cubic cms
Total no of cosmic rays: 283
Time period:29 min 3secs
Density/time = 4.51*10^-2
cosmic rays/ (min *inch^3)

Experiment 1
Event 1:Highly curved track towards right: negatively charged
Curved track in the magnetic field direction
"EXPLOSION" of cosmic rays(straight,curve,zig-zag.......most were curved and negatively charged)
5 kinked tracks(muon decay+positively charged)
2 short straight tracks
2 faint positively charged tracks and 1 negative charged tracks

A number of small explosions
Most of the rays were curved and small
Most turned towards the right ,so were negatively charged
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