تقرير
Xenon-gas ionization chamber to improve particle identification of heavy ion beams with Z>70
| العنوان: | Xenon-gas ionization chamber to improve particle identification of heavy ion beams with Z>70 |
|---|---|
| المؤلفون: | Yoshimoto, Masahiro, Fukuda, Naoki, Matsumura, Riku, Nishimura, Daiki, Otsu, Hideaki, Shimizu, Yohei, Sumikama, Toshiyuki, Suzuki, Hiroshi, Takahashi, Hiroyuki, Takeda, Hiroyuki, Tanaka, Junki, Yoshida, Koichi |
| سنة النشر: | 2024 |
| المجموعة: | High Energy Physics - Experiment Nuclear Experiment Physics (Other) |
| مصطلحات موضوعية: | Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment |
| الوصف: | In conventional ionization chambers (ICs) using P-10 (Ar+CH4) gas, as the atomic number (Z) of the ion beams increases in the energy region of 200-300 MeV/u, the Z resolution deteriorates rapidly when Z>70. This degradation is attributed to substantial energy loss straggling caused by charge state fluctuation when the beams traverse a gas medium. The energy loss straggling increases when the beams cannot attain charge state equilibrium in the IC gas. In this study, a xenon-based gas (Xe+CH4), exhibiting a sufficiently large charge state changing cross section, was used in the IC to reach charge state equilibrium. The responses of ICs with P-10 and the xenon-based gases were examined using 238U beams and cocktail radioactive isotope (RI) beams with Z=40-90 at the RI Beam Factory (RIBF). For 238U beams at 165-344 MeV/u, the P-10 gas IC yielded an energy resolution of 1.9-3.0% in full width at half maximum (FWHM), which proved inadequate for Z identification in the uranium region. In contrast, the xenon-based gas IC demonstrated a satisfactory energy resolution of 1.4-1.6%. When using cocktail RI beams, a Z resolution of 1.28 and 0.74 was achieved by the P-10 and the xenon-based gas ICs, respectively, for beams with Z=84-88 at 200 MeV/u. The contrast in Z resolutions between the P-10 and the xenon-based gas ICs was effectively elucidated by the energy loss straggling model, incorporating collisional straggling and straggling due to charge state changes in the IC gases. The xenon-based gas IC, with more than 3sigma Z separation across a broad Z range (Z=40-90), emerged as a practical solution for Z identification of heavy ion beams. Comment: 24 pages, 13 figures, 1 table |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/2401.08679Test |
| رقم الانضمام: | edsarx.2401.08679 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |