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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2508.00703 |
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| author | Riley, L. A. Conroy, I. Himmelreich, A. M. Heinze, M. Kosa, J. McNulty, B. Cottle, P. D. Spieker, M. Volya, A. Conley, A. L. Houlihan, D. Kelly, B. Kemper, K. W. Ali, Sk M. Beck, T. Gillespie, S. A. Hausmann, M. Noji, S. Pereira, J. Weisshaar, D. Chung-Jung, J. Farris, P. Gade, A. Grauvogel, G. Hill, A. M. Rahman, Z. Zegers, R. G. T. Longfellow, B. Pathirana, N. D. |
| author_facet | Riley, L. A. Conroy, I. Himmelreich, A. M. Heinze, M. Kosa, J. McNulty, B. Cottle, P. D. Spieker, M. Volya, A. Conley, A. L. Houlihan, D. Kelly, B. Kemper, K. W. Ali, Sk M. Beck, T. Gillespie, S. A. Hausmann, M. Noji, S. Pereira, J. Weisshaar, D. Chung-Jung, J. Farris, P. Gade, A. Grauvogel, G. Hill, A. M. Rahman, Z. Zegers, R. G. T. Longfellow, B. Pathirana, N. D. |
| contents | We have measured the $0_{g.s.}^+ \rightarrow 2_1^+$ transition in the neutron rich $N=28$ isotope $^{42}$Si using the probes of intermediate energy Coulomb excitation and inelastic proton scattering in inverse kinematics at the Facility for Rare Isotope Beams with beam particle rates of $\approx 5$ particles/s. The results of these two measurements allowed us to determine $M_n/M_p$, the ratio of the neutron and proton transition matrix elements for the $0_{g.s.}^+ \rightarrow 2_1^+$ transition. In addition, we have measured the $0_{\mathrm{g.s.}}^+ \rightarrow 2_1^+$ transition in the isotone $^{44}$S using inverse kinematics inelastic proton scattering. By comparing the $^{44}$S proton scattering result with a recent intermediate energy Coulomb excitation result on the same transition, we were able to determine $M_n/M_p$ for the $0_{g.s.}^+ \rightarrow 2_1^+$ transition in this nucleus as well. This work strengthens the evidence that $^{42}$Si has a stable quadrupole deformation in its ground state and that $^{44}$S does not. Both conclusions are further supported by shell model calculations carried out with the FSU interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_00703 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Determination of proton and neutron contributions to the $0_{g.s.}^+ \rightarrow 2_1^+$ excitations in $^{42}$Si and $^{44}$S using inelastic proton scattering in inverse kinematics and intermediate energy Coulomb excitation Riley, L. A. Conroy, I. Himmelreich, A. M. Heinze, M. Kosa, J. McNulty, B. Cottle, P. D. Spieker, M. Volya, A. Conley, A. L. Houlihan, D. Kelly, B. Kemper, K. W. Ali, Sk M. Beck, T. Gillespie, S. A. Hausmann, M. Noji, S. Pereira, J. Weisshaar, D. Chung-Jung, J. Farris, P. Gade, A. Grauvogel, G. Hill, A. M. Rahman, Z. Zegers, R. G. T. Longfellow, B. Pathirana, N. D. Nuclear Experiment We have measured the $0_{g.s.}^+ \rightarrow 2_1^+$ transition in the neutron rich $N=28$ isotope $^{42}$Si using the probes of intermediate energy Coulomb excitation and inelastic proton scattering in inverse kinematics at the Facility for Rare Isotope Beams with beam particle rates of $\approx 5$ particles/s. The results of these two measurements allowed us to determine $M_n/M_p$, the ratio of the neutron and proton transition matrix elements for the $0_{g.s.}^+ \rightarrow 2_1^+$ transition. In addition, we have measured the $0_{\mathrm{g.s.}}^+ \rightarrow 2_1^+$ transition in the isotone $^{44}$S using inverse kinematics inelastic proton scattering. By comparing the $^{44}$S proton scattering result with a recent intermediate energy Coulomb excitation result on the same transition, we were able to determine $M_n/M_p$ for the $0_{g.s.}^+ \rightarrow 2_1^+$ transition in this nucleus as well. This work strengthens the evidence that $^{42}$Si has a stable quadrupole deformation in its ground state and that $^{44}$S does not. Both conclusions are further supported by shell model calculations carried out with the FSU interaction. |
| title | Determination of proton and neutron contributions to the $0_{g.s.}^+ \rightarrow 2_1^+$ excitations in $^{42}$Si and $^{44}$S using inelastic proton scattering in inverse kinematics and intermediate energy Coulomb excitation |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2508.00703 |