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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2509.09776 |
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| author | Pathirana, N. D. Zegers, R. G. T. Gao, B. Spyrou, A. Larsen, A. C. Berg, H. Bazin, D. Crawford, H. L. Gade, A. Gastis, P. Ginter, T. Guess, C. J. Guttormsen, M. Noji, S. Longfellow, B. Pereira, J. Riley, L. A. Weisshaar, D. Zamora, J. C. |
| author_facet | Pathirana, N. D. Zegers, R. G. T. Gao, B. Spyrou, A. Larsen, A. C. Berg, H. Bazin, D. Crawford, H. L. Gade, A. Gastis, P. Ginter, T. Guess, C. J. Guttormsen, M. Noji, S. Longfellow, B. Pereira, J. Riley, L. A. Weisshaar, D. Zamora, J. C. |
| contents | The $^{93}$Nb($t$,$^{3}$He) reaction at 115 MeV/u was studied to demonstrate that nuclear level densities and $γ$-ray strength functions can be extracted from charge-exchange reactions at intermediate energies using the Oslo technique. The matrix of excitation energy in $^{93}$Zr, reconstructed from the ($t$,$^{3}$He) reaction, versus the energy of $γ$ rays emitted by the excited $^{93}$Zr nuclei, was obtained in an experiment with the S800 Spectrograph operated in coincidence with the GRETINA $γ$-ray detector. The extracted level density and $γ$-ray strength function obtained by applying the Oslo method to this matrix were used to estimate the $^{92}$Zr($n$,$γ$)$^{93}$Zr cross section by combining the new results with other experimental data and theoretical calculations for $E$1 and $M$1 strength functions at higher energies. Good agreement with direct measurements of the $^{92}$Zr($n$,$γ$)$^{93}$Zr cross section was found. The contribution from the upbend in the extracted $γ$-ray strength function was important to achieve the consistency as the neutron-capture cross section without this contribution is significantly below the direct measurements otherwise. Since charge-exchange reactions at intermediate energies have long been used for extracting Gamow-Teller strengths, the successful demonstration of the charge-exchange Oslo method enables experiments in which ($n$,$γ$) cross sections and Gamow-Teller strengths can be measured simultaneously, which is of benefit for astrophysical studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_09776 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extraction of neutron-capture cross sections on $^{92}$Zr using the charge-exchange Oslo method Pathirana, N. D. Zegers, R. G. T. Gao, B. Spyrou, A. Larsen, A. C. Berg, H. Bazin, D. Crawford, H. L. Gade, A. Gastis, P. Ginter, T. Guess, C. J. Guttormsen, M. Noji, S. Longfellow, B. Pereira, J. Riley, L. A. Weisshaar, D. Zamora, J. C. Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory The $^{93}$Nb($t$,$^{3}$He) reaction at 115 MeV/u was studied to demonstrate that nuclear level densities and $γ$-ray strength functions can be extracted from charge-exchange reactions at intermediate energies using the Oslo technique. The matrix of excitation energy in $^{93}$Zr, reconstructed from the ($t$,$^{3}$He) reaction, versus the energy of $γ$ rays emitted by the excited $^{93}$Zr nuclei, was obtained in an experiment with the S800 Spectrograph operated in coincidence with the GRETINA $γ$-ray detector. The extracted level density and $γ$-ray strength function obtained by applying the Oslo method to this matrix were used to estimate the $^{92}$Zr($n$,$γ$)$^{93}$Zr cross section by combining the new results with other experimental data and theoretical calculations for $E$1 and $M$1 strength functions at higher energies. Good agreement with direct measurements of the $^{92}$Zr($n$,$γ$)$^{93}$Zr cross section was found. The contribution from the upbend in the extracted $γ$-ray strength function was important to achieve the consistency as the neutron-capture cross section without this contribution is significantly below the direct measurements otherwise. Since charge-exchange reactions at intermediate energies have long been used for extracting Gamow-Teller strengths, the successful demonstration of the charge-exchange Oslo method enables experiments in which ($n$,$γ$) cross sections and Gamow-Teller strengths can be measured simultaneously, which is of benefit for astrophysical studies. |
| title | Extraction of neutron-capture cross sections on $^{92}$Zr using the charge-exchange Oslo method |
| topic | Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory |
| url | https://arxiv.org/abs/2509.09776 |