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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.06772 |
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| _version_ | 1866908477552590848 |
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| author | Ali, Sk M. Maher, C. Zegers, R. G. T. Scott, M. Bazin, D. Bowry, M. Brown, B. A. Campbell, C. M. Gade, A. Gales, S. Garg, U. Harakeh, M. N. Kwan, E. Langer, C. Loelius, C. Morse, C. Noji, S. Redpath, T. Sakai, H. Sasano, M. Sullivan, C. Weisshaar, D. |
| author_facet | Ali, Sk M. Maher, C. Zegers, R. G. T. Scott, M. Bazin, D. Bowry, M. Brown, B. A. Campbell, C. M. Gade, A. Gales, S. Garg, U. Harakeh, M. N. Kwan, E. Langer, C. Loelius, C. Morse, C. Noji, S. Redpath, T. Sakai, H. Sasano, M. Sullivan, C. Weisshaar, D. |
| contents | The isovector response in $^{12}$B was investigated via the $^{12}$C($^{10}\mathrm{Be}$,$^{10}\mathrm{B}$+$γ$)$^{12}$B$^\ast$ reaction at $100 A \, \mathrm{MeV}$. By utilizing the $γ$-decay properties of the 1.74 MeV $0^{+}$ and 0.718 MeV $1^{+}$ states in $^{10}\mathrm{B}$, the separate extraction of the non-spin-transfer ($ΔS=0$) and spin-transfer ($ΔS=1$) isovector responses up to an excitation energy of 50 MeV in $^{12}$B in a single measurement is demonstrated. The experimental setup employed the S800 spectrometer to detect and analyze the $^{10}\mathrm{B}$ ejectiles and the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) for obtaining the Doppler-reconstructed spectrum for $γ$-rays emitted in-flight by $^{10}\mathrm{B}$. A $^{12}$C foil was placed at the pivot point of the spectrograph. The $^{12}$B reaction product was not detected. Contributions from transitions associated with the transfer of different units of angular momentum in the non-spin- and spin-transfer responses were analyzed using a multipole decomposition analysis. The extracted non-spin-dipole ($ΔS=0$, $ΔL=1$) and spin-dipole ($ΔS=1$, $ΔL=1$) responses were found to be consistent with available data from other charge-exchange probes, validating the non-spin- and spin-transfer filters used. While statistical uncertainties and experimental resolutions were relatively large due to the modest intensity of the $^{10}\mathrm{Be}$ secondary beam, the results show that, with the much higher intensities that will be available at new rare-isotope beam facilities, the ($^{10}\mathrm{Be}$,$^{10}\mathrm{B}$+$γ$) reaction and its $ΔT_{z}=-1$ partner, the ($^{10}$C,$^{10}\mathrm{B}$+$γ$) reaction, are powerful tools for elucidating the isovector non-spin- and spin-transfer responses in nuclei. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06772 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extraction of the non-spin- and spin-transfer isovector responses via the $^{12}\mathrm{C}(^{10}\mathrm{Be},{}^{10}\mathrm{B}+γ)^{12}\mathrm{B}$ reaction Ali, Sk M. Maher, C. Zegers, R. G. T. Scott, M. Bazin, D. Bowry, M. Brown, B. A. Campbell, C. M. Gade, A. Gales, S. Garg, U. Harakeh, M. N. Kwan, E. Langer, C. Loelius, C. Morse, C. Noji, S. Redpath, T. Sakai, H. Sasano, M. Sullivan, C. Weisshaar, D. Nuclear Experiment The isovector response in $^{12}$B was investigated via the $^{12}$C($^{10}\mathrm{Be}$,$^{10}\mathrm{B}$+$γ$)$^{12}$B$^\ast$ reaction at $100 A \, \mathrm{MeV}$. By utilizing the $γ$-decay properties of the 1.74 MeV $0^{+}$ and 0.718 MeV $1^{+}$ states in $^{10}\mathrm{B}$, the separate extraction of the non-spin-transfer ($ΔS=0$) and spin-transfer ($ΔS=1$) isovector responses up to an excitation energy of 50 MeV in $^{12}$B in a single measurement is demonstrated. The experimental setup employed the S800 spectrometer to detect and analyze the $^{10}\mathrm{B}$ ejectiles and the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) for obtaining the Doppler-reconstructed spectrum for $γ$-rays emitted in-flight by $^{10}\mathrm{B}$. A $^{12}$C foil was placed at the pivot point of the spectrograph. The $^{12}$B reaction product was not detected. Contributions from transitions associated with the transfer of different units of angular momentum in the non-spin- and spin-transfer responses were analyzed using a multipole decomposition analysis. The extracted non-spin-dipole ($ΔS=0$, $ΔL=1$) and spin-dipole ($ΔS=1$, $ΔL=1$) responses were found to be consistent with available data from other charge-exchange probes, validating the non-spin- and spin-transfer filters used. While statistical uncertainties and experimental resolutions were relatively large due to the modest intensity of the $^{10}\mathrm{Be}$ secondary beam, the results show that, with the much higher intensities that will be available at new rare-isotope beam facilities, the ($^{10}\mathrm{Be}$,$^{10}\mathrm{B}$+$γ$) reaction and its $ΔT_{z}=-1$ partner, the ($^{10}$C,$^{10}\mathrm{B}$+$γ$) reaction, are powerful tools for elucidating the isovector non-spin- and spin-transfer responses in nuclei. |
| title | Extraction of the non-spin- and spin-transfer isovector responses via the $^{12}\mathrm{C}(^{10}\mathrm{Be},{}^{10}\mathrm{B}+γ)^{12}\mathrm{B}$ reaction |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2505.06772 |