Search for exotic n-n correlations in weakly-bound nuclei

Monday 28 Jul 2014, 12:00 → 13:00 Asia/Tokyo

RIBF Bldg. 2F, Room 203 (RIKEN Wako)

A joint group seminar of Astrophysical Big Bang Laboratory and Theoretical Nuclear Physics Laboratory Date: Monday, July 28th, 12:00- Place: Room 203, RIBF building Title: Search for exotic n-n correlations in weakly-bound nuclei Speaker: Dr. Yuma Kikuchi (RIKEN Nishina Center) Abstract: Two-neutron halo nuclei have structure in which the two neutrons are weakly bound and and spread far away from the core nucleus. These two-neutron halo nuclei have been studied by using the core+n+n three-body models theoretically. The results of three-body model calculations show the importance of the correlation between halo neutrons and this n-n correlation is characterized as a spatially-correlated n-n pair, the so-called dineutron. The dineutron correlation suggested in two-neutron halo nuclei have studied from both theoretical and experimental sides. In this talk, I will introduce our theoretical approaches to extract the dineutron correlation in two-neutron halo nuclei 6He from the observables. I here discuss three types of 6He-induced reactions: Coulomb breakup, nuclear breakup, and neutron-knockout reactions, and then show the role of n-n correlation in these reactions. ------------------- Title: Cosmic-Ray Acceleration and Photon Production during the Afterglow Phase of Gamma-ray Bursts Speaker: Dr. Don Warren (North Carolina State University, Visitor of ABB Lab) Abstract: The afterglows of gamma-ray bursts offer insight into the bursts themselves, and understanding afterglows requires understanding the high-energy particles they produce. In this brief talk I will motivate and outline a three-year project to explore the connection between gamma-ray bursts and cosmic rays. I will also explain how the project fits in with the expertise of the Astrophysical Big Bang Laboratory here at RIKEN. ---