Xenon-gas ionization chamber to improve particle identification of heavy ion beams with Z>70
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913422404222976 |
|---|---|
| author | Yoshimoto, Masahiro Fukuda, Naoki Matsumura, Riku Nishimura, Daiki Otsu, Hideaki Shimizu, Yohei Sumikama, Toshiyuki Suzuki, Hiroshi Takahashi, Hiroyuki Takeda, Hiroyuki Tanaka, Junki Yoshida, Koichi |
| author_facet | Yoshimoto, Masahiro Fukuda, Naoki Matsumura, Riku Nishimura, Daiki Otsu, Hideaki Shimizu, Yohei Sumikama, Toshiyuki Suzuki, Hiroshi Takahashi, Hiroyuki Takeda, Hiroyuki Tanaka, Junki Yoshida, Koichi |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_08679 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Xenon-gas ionization chamber to improve particle identification of heavy ion beams with Z>70 Yoshimoto, Masahiro Fukuda, Naoki Matsumura, Riku Nishimura, Daiki Otsu, Hideaki Shimizu, Yohei Sumikama, Toshiyuki Suzuki, Hiroshi Takahashi, Hiroyuki Takeda, Hiroyuki Tanaka, Junki Yoshida, Koichi Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment 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. |
| title | Xenon-gas ionization chamber to improve particle identification of heavy ion beams with Z>70 |
| topic | Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2401.08679 |