Talk:Barn (unit)

message: The barn is not listed on the official table of accepted non-SI units that is linked in the article...perhaps it was removed?  I'll remove that statement in a while, unless someone objects.  --Bmk 14:52, 10 July 2006 (UTC)
replies: text: The barn is used in documentation from the early nuclear era.  I don't think it's much found these days (though I'm not up in the field, so I could well be mistaken).  I would rather see it added to the page of unofficial units than have the link deleted from here.--King Hildebrand 16:26, 2 August 2006 (UTC)

text: I've "been bold" and deleted it. I hope that's OK. 92.20.226.103 (talk) 02:09, 7 July 2012 (UTC)

text: I also think the ZNSNCS terms (in the section "Commonly used prefixed versions") are complete nonsense and should be deleted. These terms are just one person's joke idea and have no currency. But I've deleted enough today.  — Preceding unsigned comment added by 92.20.226.103 (talk) 02:24, 7 July 2012 (UTC)

text: Just some random online glossary will not do as an authority to confirm the usage of "outhouse". Will move it to the section with "commonly used prefixed versions". Kotika98 (talk) 13:51, 8 April 2013 (UTC)
thread_title:  Barn is not listed 

message: I had it explained to me a few years back as this: researchers had expected that neutrons would have to have a direct strike on a nucleus to trigger the fission, but then found that it would still trigger it when passing close by. This meant that the cross-sectional area for triggering the reaction was much larger than expected - i.e. like hitting a barn door. I don't have any reference to back this up though, so I don't want to blindly change the explaination in the article. Andrewjrallan 14:50, 19 July 2006 (UTC)
thread_title:  Origin 

message: Gold nuclear radius ~ 3 x 10-14 metres so about 10 barns??? Uranium nucleus is one barn?
was looking for link or conversion factor for barns (area) to nuclear(atomic) radius. Gadolinium neutron absorption cross section  (49000barn) versus (180 picometer) atomic radius.  —Preceding unsigned comment added by Shjacks45 (talk • contribs) 10:44, 1 July 2008 (UTC)
thread_title:  Uranium nucleus? 

message: See shed - it says 10-48 m2, but  if it is 10-24 b, then it should be 10-48 *cm*2, or 10-52 m2. See also Wikipedia entry for 'shed'. Main article corrected accordingly.  —Preceding unsigned comment added by 24.61.45.41 (talk) 03:06, 3 July 2008 (UTC)
thread_title:  Error in shed size ? 

message: I changed the redirect from "Barns" from "Barn (unit)" to "Barn (disambiguation)", since I think those searching for "barns" are more likely to be interested in the buildings than the units of measurement. Giles Martin (talk) 15:32, 1 April 2009 (UTC)
thread_title:  Redirect from "Barns" 

message: I found a press release from Fermilab to indicate how long it took to achieve a femtobarn and replaced the "citation needed".  However the reference seems to indicate that run II started March 2001 and one femtobarn had been achieved by June 2005.  This refutes the claim that it took over a decade.  Perhaps the claim is including the time of run I (how long?).  —Preceding unsigned comment added by 76.21.117.175 (talk) 04:08, 9 April 2010 (UTC)
thread_title:  Time for Fermilab to achieve an inverse femtobarn 

message: I couldn't find a reference for "silo". Anyone?  — Preceding unsigned comment added by 129.217.129.134 (talk) 19:08, 29 November 2011 (UTC)
thread_title:  Silo 

message: > The "inverse femtobarn" (fb−1) is a measurement of particle collision events per femtobarn of target cross-section, and is the conventional unit for time-integrated luminosity.
It is true that the number of events in some channel is equal to N=I σ, where I is integrated luminocity and sigma the crosssection.  But, that definition  above is strictly speaking not correct. It confuses the cause and effect. The correct definition is the number of particles delivered divided by the area of the beam. It is called "integrated luminocity" and it does not depend on the target cross section. For example, in a fixed target experiment, it is the a measure of the beam , while the crosssection is a property of the target only. 112.80.242.190 (talk) 02:16, 10 July 2013 (UTC)
thread_title:  Inverse femtobarn 

message: 1 km2 = 1 000 000 m2, not 1000, since it's defined as 1000 m × 1000 m. How come 1 kilobarn is 1000 barn?
:Just like how 1 kilolitre is 1000 litres. Double sharp (talk) 20:36, 30 November 2022 (UTC)
replies: text: And how 1 millilitre is 0.001 litres. Dondervogel 2 (talk) 01:15, 11 November 2023 (UTC)
thread_title:  Kilobarn, millibarn etc. 

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thread_title:  External links modified 

message: Does it make sense to add List of humorous units of measurement to the "See also" sections for this and shakes? -- ScratchMonkey (talk) 11:53, 9 May 2021 (UTC)
thread_title:  Humorous unit?