$β$-decay Measurements Near the $N=40$ Island of Inversion to Quantify Cooling of Accreted Neutron Star Crusts
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| Format: | Preprint |
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2026
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| author | Hermansen, K. Ong, W. -J. Schatz, H. Browne, J. Chester, A. Childers, K. Jain, R. Liddick, S. Lyons, S. Miskovich, S. A. Möller, P. Montes, F. Owens-Fryar, J. Palmisano-Kyle, A. Richard, A. L. Rijal, N. Smith, M. Soltesz, D. Spyrou, A. Subedi, S. K. Wagner, L. |
| author_facet | Hermansen, K. Ong, W. -J. Schatz, H. Browne, J. Chester, A. Childers, K. Jain, R. Liddick, S. Lyons, S. Miskovich, S. A. Möller, P. Montes, F. Owens-Fryar, J. Palmisano-Kyle, A. Richard, A. L. Rijal, N. Smith, M. Soltesz, D. Spyrou, A. Subedi, S. K. Wagner, L. |
| contents | Understanding the thermal structure of the outer crust of accreting neutron stars is important to interpret astronomical X-ray observations. Ground-state to ground-state $β$-decay transitions of neutron-rich nuclei comprising the crust enable Urca neutrino cooling processes that affect this thermal structure. Here we constrain the ground-state to ground-state transition strengths for the decays of $^{57}$Sc, $^{57}$Ti, and $^{59}$Ti based on experimental data. The data were obtained by combining total absorption $γ$-spectroscopy data from the SuN detection system with $β$-delayed neutron emission data from the NERO detection system at Michigan State University's National Superconducting Cyclotron Laboratory. We find $\log ft=$5.8$^{+0.3}_{-0.2}$ and $\log ft=$5.34$^{+0.08}_{-0.24}$ for the decays of $^{57}$Ti and $^{59}$Ti, respectively, and find no evidence for ground-state feeding in the decay of $^{57}$Sc. The results indicate weaker transitions than predicted by theory and indicated by previous measurements, resulting in reduced efficiency of neutrino cooling in accreted neutron star crusts in systems that exhibit X-ray superbursts. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22669 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $β$-decay Measurements Near the $N=40$ Island of Inversion to Quantify Cooling of Accreted Neutron Star Crusts Hermansen, K. Ong, W. -J. Schatz, H. Browne, J. Chester, A. Childers, K. Jain, R. Liddick, S. Lyons, S. Miskovich, S. A. Möller, P. Montes, F. Owens-Fryar, J. Palmisano-Kyle, A. Richard, A. L. Rijal, N. Smith, M. Soltesz, D. Spyrou, A. Subedi, S. K. Wagner, L. Nuclear Experiment High Energy Astrophysical Phenomena Understanding the thermal structure of the outer crust of accreting neutron stars is important to interpret astronomical X-ray observations. Ground-state to ground-state $β$-decay transitions of neutron-rich nuclei comprising the crust enable Urca neutrino cooling processes that affect this thermal structure. Here we constrain the ground-state to ground-state transition strengths for the decays of $^{57}$Sc, $^{57}$Ti, and $^{59}$Ti based on experimental data. The data were obtained by combining total absorption $γ$-spectroscopy data from the SuN detection system with $β$-delayed neutron emission data from the NERO detection system at Michigan State University's National Superconducting Cyclotron Laboratory. We find $\log ft=$5.8$^{+0.3}_{-0.2}$ and $\log ft=$5.34$^{+0.08}_{-0.24}$ for the decays of $^{57}$Ti and $^{59}$Ti, respectively, and find no evidence for ground-state feeding in the decay of $^{57}$Sc. The results indicate weaker transitions than predicted by theory and indicated by previous measurements, resulting in reduced efficiency of neutrino cooling in accreted neutron star crusts in systems that exhibit X-ray superbursts. |
| title | $β$-decay Measurements Near the $N=40$ Island of Inversion to Quantify Cooling of Accreted Neutron Star Crusts |
| topic | Nuclear Experiment High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.22669 |