Why are there fixed target experiments?Why are “heavier” particles harder to detect than “lighter” ones?Matter-Antimatter Asymmetry in Experiments?Do the particles made in a collider exist outside the collider?Does increasing the energy of a relativistic particle increase thrust?Why are muons considered to be “elementary particles” in the Standard Model?Will the Large Hadron Collider “explode” if the power is turned up too high?How is the 4-momentum, especially the transverse momentum, in a detector calorimeter measured?What is the difference between the SiD and the ILD?How are particles produced in accelerators?
How can I pack my food so it doesn't smell?
Can a Beast Master ranger choose a swarm as an animal companion?
iPhone 8 purchased through AT&T change to T-Mobile
Why does my air conditioner still run, even when it is cooler outside than in?
Mixing colours for a symbol
Sous vide chicken without an internal temperature of 165
Why don't sharp and flat root note chords seem to be present in much guitar music?
Can my boss not paying for hours I put in to clean bar after we close?
How do I intentionally fragment a SQL Server Index?
Why doesn't mathematics collapse down, even though humans quite often make mistakes in their proofs?
Is Eldritch Blast affected by antimagic field
How does the Saturn V Dynamic Test Stand work?
Have only girls been born for a long time in this village?
Designing a prison for a telekinetic race
Why didn’t Doctor Strange stay in the original winning timeline?
I think my coworker went through my notebook and took my project ideas
Nuclear decay triggers
Is "stainless" a bulk or a surface property of stainless steel?
Don't teach Dhamma to those who can't appreciate it or aren't interested
Can I submit a paper under an alias so as to avoid trouble in my country?
Was Switzerland really impossible to invade during WW2?
What is a "click" in Greek or Latin?
Color the polygons in PolyhedronData
How can I describe being temporarily stupid?
Why are there fixed target experiments?
Why are “heavier” particles harder to detect than “lighter” ones?Matter-Antimatter Asymmetry in Experiments?Do the particles made in a collider exist outside the collider?Does increasing the energy of a relativistic particle increase thrust?Why are muons considered to be “elementary particles” in the Standard Model?Will the Large Hadron Collider “explode” if the power is turned up too high?How is the 4-momentum, especially the transverse momentum, in a detector calorimeter measured?What is the difference between the SiD and the ILD?How are particles produced in accelerators?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
Collider experiments put all their energy into $ sqrts = 2E $ while target experiments only provide $ sqrts = sqrt2Em+m^² $.
Yet, there are fixed target experiments. Why?
particle-physics particle-detectors particle-accelerators
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
$endgroup$
|
show 4 more comments
$begingroup$
Collider experiments put all their energy into $ sqrts = 2E $ while target experiments only provide $ sqrts = sqrt2Em+m^² $.
Yet, there are fixed target experiments. Why?
particle-physics particle-detectors particle-accelerators
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
$endgroup$
1
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
2
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago
|
show 4 more comments
$begingroup$
Collider experiments put all their energy into $ sqrts = 2E $ while target experiments only provide $ sqrts = sqrt2Em+m^² $.
Yet, there are fixed target experiments. Why?
particle-physics particle-detectors particle-accelerators
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
$endgroup$
Collider experiments put all their energy into $ sqrts = 2E $ while target experiments only provide $ sqrts = sqrt2Em+m^² $.
Yet, there are fixed target experiments. Why?
particle-physics particle-detectors particle-accelerators
particle-physics particle-detectors particle-accelerators
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
edited 6 hours ago
Qmechanic♦
112k13 gold badges219 silver badges1331 bronze badges
112k13 gold badges219 silver badges1331 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
asked 8 hours ago
BenBen
3631 silver badge8 bronze badges
3631 silver badge8 bronze badges
1
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
2
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago
|
show 4 more comments
1
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
2
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago
1
1
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
2
2
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
2
2
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago
|
show 4 more comments
1 Answer
1
active
oldest
votes
$begingroup$
The target density is much greater, i.e you don't have a bullet trying to hit another bullet but rather a single bullet trying to hits lots of (more) densely packed targets. As a result, the luminosity (i.e. the reaction rate) is greater.
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
$endgroup$
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "151"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f497692%2fwhy-are-there-fixed-target-experiments%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
The target density is much greater, i.e you don't have a bullet trying to hit another bullet but rather a single bullet trying to hits lots of (more) densely packed targets. As a result, the luminosity (i.e. the reaction rate) is greater.
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
$endgroup$
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
add a comment |
$begingroup$
The target density is much greater, i.e you don't have a bullet trying to hit another bullet but rather a single bullet trying to hits lots of (more) densely packed targets. As a result, the luminosity (i.e. the reaction rate) is greater.
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
$endgroup$
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
add a comment |
$begingroup$
The target density is much greater, i.e you don't have a bullet trying to hit another bullet but rather a single bullet trying to hits lots of (more) densely packed targets. As a result, the luminosity (i.e. the reaction rate) is greater.
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
$endgroup$
The target density is much greater, i.e you don't have a bullet trying to hit another bullet but rather a single bullet trying to hits lots of (more) densely packed targets. As a result, the luminosity (i.e. the reaction rate) is greater.
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
edited 7 hours ago
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
answered 7 hours ago
ZeroTheHeroZeroTheHero
22.5k5 gold badges34 silver badges69 bronze badges
22.5k5 gold badges34 silver badges69 bronze badges
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
add a comment |
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
$begingroup$
Is there really such a difference? I thought the emittance(?) would be good enough in colliding experiments respectively quite similar?
$endgroup$
– Ben
7 hours ago
2
2
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
there is a huge difference.... several orders of magnitude depending on the targets.
$endgroup$
– ZeroTheHero
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
Plus, colliders may be hard to arrange. It is easy to accelerate protons at a gold target. Much harder to arrange a collider with proton and gold beams. And then do protons on to silver next hour, then alphas on to gold, then silver...
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@Jon One of my grad school buddies ended up at RHIC for about a decade. That's what their life was like, but with added gold-on-gold, lead-on-lead, ...
$endgroup$
– dmckee♦
7 hours ago
add a comment |
Thanks for contributing an answer to Physics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f497692%2fwhy-are-there-fixed-target-experiments%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
$begingroup$
Well, they are a lot easier to arrange for random mixes of incident particle and target. Not quite sure how Geiger and Marsden would have arranged a collider experiment.
$endgroup$
– Jon Custer
8 hours ago
$begingroup$
:D I doubt that the Rutherford experiment (didn't hear it as Geiger and Marsden before) is a "particle accelerator", seen in a current technical manner ;) But yet, it is true
$endgroup$
– Ben
7 hours ago
2
$begingroup$
Luminosity, cost, the option of continuous operation (no fill-n-spill), ... If your exposure to particle physics had been mostly through the popular press then you probably have a very warped impression of what particle physics consists of.
$endgroup$
– dmckee♦
7 hours ago
$begingroup$
@dmckee Can you please extend this a bit? Is the luminosity higher in target experiments? If so, why? what is no fill- spill?
$endgroup$
– Ben
7 hours ago
2
$begingroup$
The experimental paper was authored by Geiger and Marsden, who worked in Rutherford's lab. en.wikipedia.org/wiki/Geiger%E2%80%93Marsden_experiment
$endgroup$
– Jon Custer
7 hours ago