Re: max energy (long...)

[brian whatcott <inet@INTELLISYS.NET>]

Is there some maximal attainable value for the product
of h and f associated with a quantum?


At 11:50 and 10:39 AM 9/29/99 -0400, John Denker wrote:
> CERN can attain a couple of TeV, and has a 14 TeV machine under
> construction.
>
> Cosmic rays do better.  According to
>  http://www.unicamp.br/~turtelli/www4.htm
>    ....
> * Above the energy of 10^20eV, only one particle falls
> on a square kilometer
> in a century.

> John S. Denker                                jsd@monmouth.com



This was just what I needed to browse on the TeV, Pev, EeV
keywords of the Fast search engine.
(High Energy particle references fall with increasing
multiplier prefixes.)

--------------------------------------------------------------
 Prefiksi mjernih jedinica
1018 - eksa - E    (we would say exa)
1015 - peta - P
1012 - tera - T
109  - giga - G
106  - mega - M
103  - kilo - k
102  - hekto - h
10   - deka - da ...   according to
     http://www.ccs.pbf.hr/kemija/predavanja/kemija01/tsld008.htm

---------------------------------------------------------------

A Russian author notes:
-------------------------------------------------------------------
Cosmic rays observed near the Earth appear to be a mixture of two
fluxes of different origin and different nucleus composition.

In the first, the proton flux is dominant. The sources producing this
flux accelerate particles up to the energy of 3Z TeV effectively. This
type of source is probably associated with small-mass supernovae
 exploding into a homogeneous interstellar medium. In the
second type of flux, nuclei heavier than helium are dominant.

 There are few protons in the second flux. Sources producing this flux
accelerate particles associated with massive supernovae exploding
into their former stellar winds.
(Unable to attribute the Russian author correctly).
-------------------------------------------------------------------

There is evidently room for differences of opinion on relative
flux with energy:
 see...
-------------------------------------------------------------------
Session M7 - Nuclear / Cosmic Ray Astrophysics.
MIXED session, Monday morning, April 20
Room C212, Columbus Conv. Center

[M7.12] Prospects for detection of UHE cosmic
neutrinos (E_\nu > 10^18 eV).

David Seckel (Bartol Research Institute, University of Delaware)

Interactions of ultra high energy (UHE) cosmic rays with the cosmic
microwave background are a ``guaranteed'' flux of UHE neutrinos
(E_\nu > 10^18 eV), at a level of
\phi_\nu(E_\nu > 10^18) \approx km^-2 sr^-1 yr^-1.
--------------------------------------------------------------

and then again, with a delightful usage of the word 'modest'...
--------------------------------------------------------------

Muons
produced in cosmic ray air showers are unlikely to be observable,
but may produce up to 10 events per yr (E>10^18 eV) if
charm production is unexpectedly high.

The radio ice cherenkov technique may permit construction of such a
detector at modest cost ($50 M).

(Unable to attribute correctly to the US author)
----------------------------------------------------------------

I was charmed at the idea of enthusiastic adults collectively
observing airshowers...
-------------------------------------------------------------------
Ultra High Energy Cosmic Ray Workshop Ultra High Energy Cosmic Ray
Workshop - Program

Workshop on "Observing Giant Cosmic Ray Airshowers for > 1020 eV
Particles from Space"
 November 13, 14 and 15th 1997 Center for Adult Education University
of Maryland

-------------------------------------------------------------------
...but the most attractive offering as an introduction to these
high energy species was given at this URL:

 http://csr.phys.ualberta.ca/~alta/stud/booklet/part3.html









brian whatcott <inet@intellisys.net>
Altus OK