Proton-unbound states in $^{24}{\rm Al}$ relevant for the $^{23}{\rm Mg}(p,γ)$ reaction in novae
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Vyfers, E. C. Pesudo, V. Triambak, S. Kamil, M. Adsley, P. Brown, B. A. Jivan, H. Marin-Lambarri, D. J. Neveling, R. Ondze, J. C. Nzobadila Papka, P. Pellegri, L. Rebeiro, B. M. Singh, B. Smit, F. D. Steyn, G. F. |
| author_facet | Vyfers, E. C. Pesudo, V. Triambak, S. Kamil, M. Adsley, P. Brown, B. A. Jivan, H. Marin-Lambarri, D. J. Neveling, R. Ondze, J. C. Nzobadila Papka, P. Pellegri, L. Rebeiro, B. M. Singh, B. Smit, F. D. Steyn, G. F. |
| contents | Background: The nucleosynthesis of several proton-rich nuclei is determined by radiative proton-capture reactions on unstable nuclei in nova explosions. One such reaction is $^{23}{\rm Mg}(p,γ)^{24}{\rm Al}$, which links the NeNa and MgAl cycles in oxygen-neon (ONe) novae.
Purpose: To extract $^{23}{\rm Mg}(p,γ)$ resonance strengths from a study of proton-unbound states in $^{24}{\rm Al}$, produced via the $^{24}$Mg($^{3}$He,$t$) reaction.
Methods: A beam of $^3 {\rm He}^{2+}$ ions at 50.7 MeV was used to produce the states of interest in $^{24}$Al. Proton-triton angular correlations were measured with a $K=600$ QDD magnetic spectrometer and a silicon detector array, located at iThemba LABS, South Africa.
Results: We measured the excitation energies of the four lowest proton-unbound states in $^{24}$Al and place lower-limits on $Γ_p/Γ$ values for these four states. Together with shell-model calculations of partial gamma widths, the experimental data are also used to determine resonance strengths for the three lowest $^{23}{\rm Mg}(p,γ)^{24}{\rm Al}$ resonances.
Conclusions: The energy of the dominant first $^{23}{\rm Mg}(p,γ)$ resonance is determined to be $E_{r} = 478 \pm 4$ keV, with a resonance strength $ωγ= 19 \pm 9$ meV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_15935 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Proton-unbound states in $^{24}{\rm Al}$ relevant for the $^{23}{\rm Mg}(p,γ)$ reaction in novae Vyfers, E. C. Pesudo, V. Triambak, S. Kamil, M. Adsley, P. Brown, B. A. Jivan, H. Marin-Lambarri, D. J. Neveling, R. Ondze, J. C. Nzobadila Papka, P. Pellegri, L. Rebeiro, B. M. Singh, B. Smit, F. D. Steyn, G. F. Nuclear Experiment Background: The nucleosynthesis of several proton-rich nuclei is determined by radiative proton-capture reactions on unstable nuclei in nova explosions. One such reaction is $^{23}{\rm Mg}(p,γ)^{24}{\rm Al}$, which links the NeNa and MgAl cycles in oxygen-neon (ONe) novae. Purpose: To extract $^{23}{\rm Mg}(p,γ)$ resonance strengths from a study of proton-unbound states in $^{24}{\rm Al}$, produced via the $^{24}$Mg($^{3}$He,$t$) reaction. Methods: A beam of $^3 {\rm He}^{2+}$ ions at 50.7 MeV was used to produce the states of interest in $^{24}$Al. Proton-triton angular correlations were measured with a $K=600$ QDD magnetic spectrometer and a silicon detector array, located at iThemba LABS, South Africa. Results: We measured the excitation energies of the four lowest proton-unbound states in $^{24}$Al and place lower-limits on $Γ_p/Γ$ values for these four states. Together with shell-model calculations of partial gamma widths, the experimental data are also used to determine resonance strengths for the three lowest $^{23}{\rm Mg}(p,γ)^{24}{\rm Al}$ resonances. Conclusions: The energy of the dominant first $^{23}{\rm Mg}(p,γ)$ resonance is determined to be $E_{r} = 478 \pm 4$ keV, with a resonance strength $ωγ= 19 \pm 9$ meV. |
| title | Proton-unbound states in $^{24}{\rm Al}$ relevant for the $^{23}{\rm Mg}(p,γ)$ reaction in novae |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2311.15935 |