Author/Authors :
K. Assamagan، نويسنده , , K. and Baker، نويسنده , , K. and Bayatyan، نويسنده , , G. and Carlini، نويسنده , , R. and Danagoulian، نويسنده , , S. and Eden، نويسنده , , T. and Egiyan، نويسنده , , K. and Ent، نويسنده , , R. and Fenker، نويسنده , , H. and Gan، نويسنده , , L. and Gasparian، نويسنده , , A. and Grigoryan، نويسنده , , N. N. Greenwood, A. Earnshaw، نويسنده , , Z. and Gueye، نويسنده , , P. and Hashimoto، نويسنده , , O. and Johnston، نويسنده , , K. and ، نويسنده ,
Abstract :
A time-zero fission fragment (FF) detector, based on the technique of low-pressure multiwire proportional chambers (LPMWPC), has been designed and constructed for the heavy hypernuclear lifetime experiment (E95-002) at Thomas Jefferson National Accelerator Facility. Its characteristics and the method of time-zero reconstruction were investigated using fission fragments from a 252Cf spontaneous fission source. The influence of the ionization energy loss was also studied. It is shown that Heptane, Hexane, and Isobutane gases at a pressure of 1–2 Torr are all suitable for such a FF detector. As desired by experiment, a timing resolution of about 200 ps (FWHM) for a chamber size of 21×21 cm2 was achieved.
