First evidence for the J$>$1 components of the pygmy dipole resonance in neutron-rich nuclei
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908622475231232 |
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| author | Li, R. Litvinova, E. Harakeh, M. N. Verney, D. Matea, I. Ayoubi, L. Al Falou, H. Al Bednarczyk, P. Benzoni, G. Bozkurt, V. Bracco, A. Ciemała, M. Crespi, F. C. L. Deloncle, I. Ebata, S. Gottardo, A. Hadyńska-Klęk, K. Jovancevic, N. Kankainen, A. Kmiecik, M. Maj, A. Martínez, T. Nanal, V. Stezowski, O. |
| author_facet | Li, R. Litvinova, E. Harakeh, M. N. Verney, D. Matea, I. Ayoubi, L. Al Falou, H. Al Bednarczyk, P. Benzoni, G. Bozkurt, V. Bracco, A. Ciemała, M. Crespi, F. C. L. Deloncle, I. Ebata, S. Gottardo, A. Hadyńska-Klęk, K. Jovancevic, N. Kankainen, A. Kmiecik, M. Maj, A. Martínez, T. Nanal, V. Stezowski, O. |
| contents | Gamma ($γ$) decay shapes the synthesis of heavy elements in neutron-rich nuclear environments of neutron star mergers, supplying the Universe with heavy elements. The low-energy pygmy dipole resonance (PDR) influences nuclear reaction rates of the rapid nucleosynthesis through enhanced $γ$ transitions. However, since it is difficult to reproduce astrophysical conditions in laboratories, PDR was previously observed only in $J = 1$ spin states. Here we report the first experimental observation of $J > 1$ components of PDR, identified in the $β$-delayed $γ$ decay of the J$^π$ = 3$^{-}$ spin-parity isomer of $^{80}$Ga. The data analysis, combined with decay information and theoretical calculations allows the identification of resonant structures below the neutron emission threshold of the neutron-rich germanium $^{80}$Ge as J$^π = (2,3)^-$ components of the PDR built on the low-lying J$^π$ = 2$^+$ quadrupole state. Our findings extend the concept of PDR beyond dipole states, with implications for nuclear structure theory and experiment, as well as the element production in the cosmos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_27125 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First evidence for the J$>$1 components of the pygmy dipole resonance in neutron-rich nuclei Li, R. Litvinova, E. Harakeh, M. N. Verney, D. Matea, I. Ayoubi, L. Al Falou, H. Al Bednarczyk, P. Benzoni, G. Bozkurt, V. Bracco, A. Ciemała, M. Crespi, F. C. L. Deloncle, I. Ebata, S. Gottardo, A. Hadyńska-Klęk, K. Jovancevic, N. Kankainen, A. Kmiecik, M. Maj, A. Martínez, T. Nanal, V. Stezowski, O. Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory Gamma ($γ$) decay shapes the synthesis of heavy elements in neutron-rich nuclear environments of neutron star mergers, supplying the Universe with heavy elements. The low-energy pygmy dipole resonance (PDR) influences nuclear reaction rates of the rapid nucleosynthesis through enhanced $γ$ transitions. However, since it is difficult to reproduce astrophysical conditions in laboratories, PDR was previously observed only in $J = 1$ spin states. Here we report the first experimental observation of $J > 1$ components of PDR, identified in the $β$-delayed $γ$ decay of the J$^π$ = 3$^{-}$ spin-parity isomer of $^{80}$Ga. The data analysis, combined with decay information and theoretical calculations allows the identification of resonant structures below the neutron emission threshold of the neutron-rich germanium $^{80}$Ge as J$^π = (2,3)^-$ components of the PDR built on the low-lying J$^π$ = 2$^+$ quadrupole state. Our findings extend the concept of PDR beyond dipole states, with implications for nuclear structure theory and experiment, as well as the element production in the cosmos. |
| title | First evidence for the J$>$1 components of the pygmy dipole resonance in neutron-rich nuclei |
| topic | Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory |
| url | https://arxiv.org/abs/2510.27125 |