Editing Rossi X-ray Timing Explorer (section)

=== High Energy X-ray Timing Experiment (HEXTE) ===
The High-Energy X-ray Timing Experiment (HEXTE) is a scintillator array for the study of temporal and temporal/spectral effects of the hard X-ray (20 to 200 keV) emission from galactic and extragalactic sources.<ref name="Experiment3">{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1995-074A-03 |title=Experiment: High Energy X-ray Timing Experiment (HEXTE) |publisher=NASA |date=28 October 2021 |access-date=28 November 2021}} {{PD-notice}}</ref> The HEXTE consisted of two clusters each containing four [[phoswich detector|phoswich scintillation detectors]]. Each cluster could "rock" (beam switch) along mutually orthogonal directions to provide background measurements 1.5° or 3.0° away from the source every 16 to 128 seconds. In addition, the input was sampled at 8 [[microsecond]]s so as to detect time-varying phenomena. Automatic gain control was provided by using an {{SimpleNuclide|americium|241|link=yes}} radioactive source mounted in each detector's field of view. The HEXTE's basic properties were:<ref>{{cite web |url=http://heasarc.gsfc.nasa.gov/docs/xte/HEXTE.html |title=High Energy X-ray Timing Experiment (HEXTE) |publisher=NASA |date=1999-09-14 |access-date=2012-02-03}} {{PD-notice}}</ref>

* Energy range: 15–250 keV;
* Energy resolution: 15% at 60 keV;
* Time sampling: 8 microseconds;
* Field of view: 1° [[Full width at half maximum|FWHM]];
* Detectors: 2 clusters of 4 NaI/CsI [[scintillation counter]]s;
* Collecting area: 2 × {{cvt|800|cm2}};
* Sensitivity: 1-Crab = 360 count/second per HEXTE cluster;
* Background: 50 count/second per HEXTE cluster.

The HEXTE was designed and built by the [http://cass.ucsd.edu Center for Astrophysics & Space Sciences (CASS)] at the [[University of California, San Diego]]. The HEXTE principal investigator was [https://web.archive.org/web/20081229041202/http://mamacass.ucsd.edu/people/rrothschild.html Dr. Richard E. Rothschild].