Neutrino flux measurents?

  • A
  • Thread starter kimmm
  • Start date
  • #1
18
0

Main Question or Discussion Point

How does the neutrio flux can be measured by a near detector of the accelerator neutrio experiments,such as T2K?
As I know neutrino interactions with the matter in the near detector is too low,and so how they can count the neutrino flux by counting the produced particle from the interaction?
 
Last edited:

Answers and Replies

  • #2
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
16,693
6,467
Have you tried to do the maths? The rate is not too low. In fact, it is typically higher than in the far detector as the near detector is much closer and the flux decreases as ##1/L^2## with the distance ##L## from the source.
 
  • #3
18
0
Have you tried to do the maths? The rate is not too low. In fact, it is typically higher than in the far detector as the near detector is much closer and the flux decreases as ##1/L^2## with the distance ##L## from the source.
yeah as you said in the near detector the rate is higher, do you know the way of calclating the flux in the near detector?
 
  • #4
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
16,693
6,467
yeah in as you said in the near detector the rate is high
So why do you claim it is not?

Typically you would compute the flux by simulations of the target station. You can make a reasonable proxy by assuming an amount of produced pions and finding the corresponding flux in the forward direction - unless what you have is an off-axis beam in which case you would need an off-axis direction.

Edit: You can also look at the simulations already done by the experiments, e.g., https://arxiv.org/pdf/1211.0469.pdf
 
  • #5
18
0
So why do you claim it is not?

Typically you would compute the flux by simulations of the target station. You can make a reasonable proxy by assuming an amount of produced pions and finding the corresponding flux in the forward direction - unless what you have is an off-axis beam in which case you would need an off-axis direction.
can I sum it up like this,although may be I am still a bit confused about that,
well as the pions produced,then they will decay to neutrinos and the neutrinos go through the detector,but still the problem is that just 1 in 10 to power 20 of the neutrios do the interaction with the target,so can we do the proportional relations to compute the neutrino flux?
 
  • #6
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
16,693
6,467
Yes, why wouldn't you? The interaction rate is proportional to the flux multiplied by the cross section. Obviously you will have related statistical and systematic uncertainties, but a priori the rate is a direct proxy for the flux.
 
  • #7
18
0
So why do you claim it is not?

Typically you would compute the flux by simulations of the target station. You can make a reasonable proxy by assuming an amount of produced pions and finding the corresponding flux in the forward direction - unless what you have is an off-axis beam in which case you would need an off-axis direction.

Edit: You can also look at the simulations already done by the experiments, e.g., https://arxiv.org/pdf/1211.0469.pdf
thanks for the paper
 
  • #8
18
0
Yes, why wouldn't you? The interaction rate is proportional to the flux multiplied by the cross section. Obviously you will have related statistical and systematic uncertainties, but a priori the rate is a direct proxy for the flux.
thank you soooo much, it was really a huge struggle in my mind.
 

Related Threads on Neutrino flux measurents?

  • Last Post
Replies
18
Views
5K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
1
Views
5K
  • Last Post
Replies
3
Views
756
  • Last Post
Replies
6
Views
5K
Replies
6
Views
3K
Replies
4
Views
2K
Replies
3
Views
2K
Top