Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.06401 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917468657680384 |
|---|---|
| author | Bozza, Riccardo Maria di Risi, Vigilante Oliviero, Veronica Ricciardi, Giulia Vissani, Francesco |
| author_facet | Bozza, Riccardo Maria di Risi, Vigilante Oliviero, Veronica Ricciardi, Giulia Vissani, Francesco |
| contents | The interpretation of the SN1987A neutrino data continues to be hindered by significant absolute timing uncertainties and a well-known tension in the angular distributions. We perform a quantitative, high-precision alignment of the Kamiokande-II and Baksan data with the IMB clock, using for the first time the relative time offset (RTO) and reducing the temporal uncertainty by two orders of magnitude to the sub-second level. The chi-square analysis shows that Baksan's absolute timestamps require an advancement of 30.4 s, while those of Kamiokande-II require a delay of about 6.4 s. The knowledge of the unified timeline provides a necessary and rigorous basis for testing whether the first Kamiokande-II event arose from the neutronization burst - a possibility motivated by its angular properties. Our analysis favors an accretion phase electron anti-neutrino origin over a neutronization-burst origin, with a likelihood ratio of 3-6, depending on the specific MSW oscillation scenario. This result corroborates the standard interpretation - that only inverse beta decay events were detected. Our framework yields the most stringent constraints to date on the SN1987A chronology and establishes a precision benchmark for future Galactic supernova observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_06401 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The temporal distribution of SN1987A neutrino events Bozza, Riccardo Maria di Risi, Vigilante Oliviero, Veronica Ricciardi, Giulia Vissani, Francesco High Energy Physics - Phenomenology High Energy Astrophysical Phenomena High Energy Physics - Experiment The interpretation of the SN1987A neutrino data continues to be hindered by significant absolute timing uncertainties and a well-known tension in the angular distributions. We perform a quantitative, high-precision alignment of the Kamiokande-II and Baksan data with the IMB clock, using for the first time the relative time offset (RTO) and reducing the temporal uncertainty by two orders of magnitude to the sub-second level. The chi-square analysis shows that Baksan's absolute timestamps require an advancement of 30.4 s, while those of Kamiokande-II require a delay of about 6.4 s. The knowledge of the unified timeline provides a necessary and rigorous basis for testing whether the first Kamiokande-II event arose from the neutronization burst - a possibility motivated by its angular properties. Our analysis favors an accretion phase electron anti-neutrino origin over a neutronization-burst origin, with a likelihood ratio of 3-6, depending on the specific MSW oscillation scenario. This result corroborates the standard interpretation - that only inverse beta decay events were detected. Our framework yields the most stringent constraints to date on the SN1987A chronology and establishes a precision benchmark for future Galactic supernova observations. |
| title | The temporal distribution of SN1987A neutrino events |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.06401 |