BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:iCalendar-Ruby BEGIN:VEVENT CATEGORIES:Lectures & Presentations DESCRIPTION:INPP Seminar | Two-neutron halos and the neutron-neutron scatte ring length\, Nov. 1\n\nThe Institute of Nuclear and Particle Physics Semin ar series presents Matthias Göbel discussing "Two-neutron halos and the neu tron-neutron scattering length"on Nov. 1 at 4 p.m. in Lindley 321.\n\n \n\n Göbel is from Technical University\, Darmstadt.\n\n \n\nIn-person seminars will be in Lindley 321. For remote seminars\, connection info for the video conference (TEAMS or ZOOM) and abstract of the talk will be communicated b y email before the seminar. The emails are sent to the inpp-seminar mailing list. To be added to this mailing list\, contact Prakash.\n\n \n\nThe host is Daniel Phillips.\n\n \n\nAbstract:\n\nTwo-neutron halos are exotic nucl ear systems with two neutrons well separated from a more tightly bound core . They offer interesting opportunities to study nuclear physics away from s tability. These halos\, which can be well described using halo effective fi eld theory (halo EFT)\, are not only exciting systems on their own but also offer new possibilities to study the fundamental neutron-neutron interacti ons.\n\n \n\nThe s-wave neutron-neutron scattering length\, the leading-ord er parameter of this interaction\, is not yet well known. Precision experim ents conducted in the late ‘90s and early ‘00s produced a range of values f rom -16.3(4) fm to -18.7(7) fm. I will talk about a new experiment proposal approved at RIKEN to measure the final neutron-neutron relative-energy dis tribution of the high-energy knockout reaction He-6(p\, p’ alpha)nn. The sc attering length can then be deduced from this distribution by comparing it to theoretical predictions parameterized by the scattering length. I will f ocus on our theoretical efforts to calculate this distribution in a systema tic manner with robust uncertainty estimates using halo effective field the ory [Phys. Rev. C 104 (2021) 2\, 024001]. Our work emphasized accurate desc ription of the neutron-neutron final-state interaction and found that the d istribution is quite sensitive to the variation of the scattering length: v arying this parameter by 2 fm changes characteristic parts of the distribut ion by 10%.\n\n \n\nIn the last part of my talk I will show that the neutro n-neutron relative-energy distribution also provides opportunities to learn about different s-wave two-neutron halo nuclei\, such as Li-11\, Be-14\, B -17\, B-19\, and C-22. I will show that this distribution can be predicted by an approach that exploits the universality of two-neutron halos as Borro mean three-body bound states beyond the classical regime. DTEND:20221101T210000Z DTSTAMP:20241123T070831Z DTSTART:20221101T200000Z GEO:39.326188;-82.101779 LOCATION:Lindley Hall\, 321 SEQUENCE:0 SUMMARY:INPP Seminar | Two-neutron halos and the neutron-neutron scattering length\, Nov. 1 UID:tag:localist.com\,2008:EventInstance_40926950916700 URL:https://calendar.ohio.edu/event/inpp_seminar_nov_1 END:VEVENT END:VCALENDAR