Radiation-tolerant polarized solid target
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866913982454956032 |
|---|---|
| author | Tateishi, K. Saito, Y. Takahashi, D. Sekiguchi, K. Aradono, K. Hirasawa, K. Maeda, Y. Nagao, Y. Nishibata, H. Otsuka, S. Sakai, H. Sugahara, H. Suzuki, K. Uesaka, T. Wakasa, T. Watanabe, A. |
| author_facet | Tateishi, K. Saito, Y. Takahashi, D. Sekiguchi, K. Aradono, K. Hirasawa, K. Maeda, Y. Nagao, Y. Nishibata, H. Otsuka, S. Sakai, H. Sugahara, H. Suzuki, K. Uesaka, T. Wakasa, T. Watanabe, A. |
| contents | Polarized targets evolved into indispensable tools in particle and nuclear physics. However, the polarized solid target is degraded by high-intense beam irradiation, known as radiation damage due to target heating and radical generation. We demonstrated a radiation-tolerant polarized solid target operating at room temperature. An annealing allows the spontaneous repair of the damage by reducing unwanted radicals. Using a single crystal of $\it p$-terphenyl doped with 0.01 mol\% pentacene-$\it d$$_{14}$, Dynamic Nuclear Polarization using photoexcited triplet electrons (Triplet-DNP) was applied to proton spins at room temperature and in 0.39 T. For the proof of concept, a deuteron beam with an energy of 135 MeV/u and the intensities of 10$^7$-10$^9$ counts per second (cps) was irradiated. The proton polarization was determined to be 3.0\% $\pm$0.2\%$\rm{(stat.)}$ $\pm$0.1\%$\rm {(sys.)}$ from a scattering asymmetry. The polarization was almost not attenuated up to 10$^9$ cps, but the target crystal was yellowed. The visible-light absorption spectroscopy suggested irreversible radiation damage due to missing protons by the knock-out reaction. The room-temperature polarized solid target allows impractical experiments with the conventional target system, leading to a next-generation spin-dependent accelerator science. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06549 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Radiation-tolerant polarized solid target Tateishi, K. Saito, Y. Takahashi, D. Sekiguchi, K. Aradono, K. Hirasawa, K. Maeda, Y. Nagao, Y. Nishibata, H. Otsuka, S. Sakai, H. Sugahara, H. Suzuki, K. Uesaka, T. Wakasa, T. Watanabe, A. Instrumentation and Detectors Nuclear Experiment Polarized targets evolved into indispensable tools in particle and nuclear physics. However, the polarized solid target is degraded by high-intense beam irradiation, known as radiation damage due to target heating and radical generation. We demonstrated a radiation-tolerant polarized solid target operating at room temperature. An annealing allows the spontaneous repair of the damage by reducing unwanted radicals. Using a single crystal of $\it p$-terphenyl doped with 0.01 mol\% pentacene-$\it d$$_{14}$, Dynamic Nuclear Polarization using photoexcited triplet electrons (Triplet-DNP) was applied to proton spins at room temperature and in 0.39 T. For the proof of concept, a deuteron beam with an energy of 135 MeV/u and the intensities of 10$^7$-10$^9$ counts per second (cps) was irradiated. The proton polarization was determined to be 3.0\% $\pm$0.2\%$\rm{(stat.)}$ $\pm$0.1\%$\rm {(sys.)}$ from a scattering asymmetry. The polarization was almost not attenuated up to 10$^9$ cps, but the target crystal was yellowed. The visible-light absorption spectroscopy suggested irreversible radiation damage due to missing protons by the knock-out reaction. The room-temperature polarized solid target allows impractical experiments with the conventional target system, leading to a next-generation spin-dependent accelerator science. |
| title | Radiation-tolerant polarized solid target |
| topic | Instrumentation and Detectors Nuclear Experiment |
| url | https://arxiv.org/abs/2508.06549 |