JACEE (Japanese-American Collaborative Emulsion Experiment)
is a series of balloon-borne lead-emulsion chambers
designed to directly measure the primary composition and spectra
of cosmic rays at energies in the region of 1 TeV - 1000 TeV.
The chamber package is flown for several days at a
high enough altitude
that atmospheric effects are eliminated.
Cosmic ray events (from the galaxy and beyond) interact in the
chamber, producing a visible trail or shower in x-ray films and
emulsion plates (sandwiched between the lead sheets).
Once the package is recovered and the films developed,
the events interacting in the chambers are catalogued, and their
charge and energy determined. From the charge and energy flux, the
spectrum for each species is derived.
The following pages describe the aspects of JACEE in greater detail:
- Balloon Flights
- JACEE-14 flew in December 1995 -
January 1996. Information will be made available here as it comes in.
- JACEE-13 was completed in
Antarctica, January 1995; a news log and flight information are available.
As data is analyzed from this flight, we hope to display it here.
Other recent flights, JACEE-11/12 (1993)
and JACEE-10 (1990),
in Antarctica have pushed the exposure time to more than one week per
- General information on scientific ballooning is available from
Facility and also Goddard
Space Flight Center.
- A tutorial of the procedure, from initial cataloguing to the final
- Selected JACEE publications.
- The members of the collaboration.
The custom hardware and software designed for JACEE.
- Darkroom Techniques (How To Do It)
- An attempt to archive valuable darkroom knowledge sitting in a little black notebook.
- 1995 Annual Progress Report to NSF
- Describes work done under a grant from NSF's Office of
Polar Programs: accomplishments during the past year and plans for the
The JACEE collaboration is also involved in
high energy interaction
studies. In layman's terms, we use the cosmic radiation
as a high energy accelerator with random particle species and energy.
Work described here is supported in part by NSF grant
Search the site (and nearby ones)
J. Grindlay, S. Meyer and M. Salamon prepared a
White Paper describing the value of the U. S. scientific balloon
Link to internal documents
of little interest outside the collaboration. To access these
documents, your computer must be at a collaborating institution. If
there are any problems, please contact the
Link to documents
at Louisiana State University, one of our collaborating institutions.
More info on particle astrophysics at UW.