Ion Optics for quasi-free $(p,pα)$ reactions with Grand Raiden Spectrometer
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911350874177536 |
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| author | Miyagawa, Taichi Tanaka, Junki |
| author_facet | Miyagawa, Taichi Tanaka, Junki |
| contents | The quasi-free $(p,pα)$ reaction is a powerful tool to probe preformed $α$ clusters in nuclei, but it requires accurate reconstruction of both momentum and scattering angles at the reaction point. In this work, ion-optical analysis for $(p,pα)$ measurements with the Grand Raiden spectrometer is presented. An under-focus optical setting was adopted to preserve sensitivity to the vertical scattering angle while maintaining high momentum resolution. The focal-plane geometry was determined independently as a purely geometrical reference. Momentum calibration was performed using elastic scattering of $^{206}$Pb$(p,p)$ at a fixed spectrometer angle. Scattering angles were reconstructed using ion-optical relations, and residual higher-order effects were corrected by a multidimensional fit. The dominant contributions to the reconstruction were found to arise from terms up to third order within the experimental acceptance. This ion-optical framework enables consistent event-by-event reconstruction of the reaction kinematics and provides a reliable basis for quasi-free $(p,pα)$ analyses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00846 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ion Optics for quasi-free $(p,pα)$ reactions with Grand Raiden Spectrometer Miyagawa, Taichi Tanaka, Junki Instrumentation and Detectors Nuclear Experiment The quasi-free $(p,pα)$ reaction is a powerful tool to probe preformed $α$ clusters in nuclei, but it requires accurate reconstruction of both momentum and scattering angles at the reaction point. In this work, ion-optical analysis for $(p,pα)$ measurements with the Grand Raiden spectrometer is presented. An under-focus optical setting was adopted to preserve sensitivity to the vertical scattering angle while maintaining high momentum resolution. The focal-plane geometry was determined independently as a purely geometrical reference. Momentum calibration was performed using elastic scattering of $^{206}$Pb$(p,p)$ at a fixed spectrometer angle. Scattering angles were reconstructed using ion-optical relations, and residual higher-order effects were corrected by a multidimensional fit. The dominant contributions to the reconstruction were found to arise from terms up to third order within the experimental acceptance. This ion-optical framework enables consistent event-by-event reconstruction of the reaction kinematics and provides a reliable basis for quasi-free $(p,pα)$ analyses. |
| title | Ion Optics for quasi-free $(p,pα)$ reactions with Grand Raiden Spectrometer |
| topic | Instrumentation and Detectors Nuclear Experiment |
| url | https://arxiv.org/abs/2601.00846 |