Polaronic neutron in dilute α matter: A p-wave Bose polaron

作     者：Hiroyuki Tajima Hajime Moriya Tomoya Naito Wataru Horiuchi Eiji Nakano Kei Iida 

作者机构：Department of Physics Graduate School of Science The University of Tokyo Tokyo 113-0033 Japan RIKEN Nishina Center Wako 351-0198 Japan Research Center for Nuclear Physics Osaka University Ibaraki 567-0047 Japan Interdisciplinary Theoretical and Mathematical Science Program (iTHEMS) RIKEN Wako 351-0198 Japan Department of Physics Osaka Metropolitan University Osaka 558-8585 Japan Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP) Osaka Metropolitan University Osaka 558-8585 Japan Department of Physics Hokkaido University Sapporo 060-0810 Japan Department of Mathematics and Physics Kochi University Kochi 780-8520 Japan 

出 版 物：《Physical Review C》 (Phys. Rev. C)

年 卷 期：2025年第111卷第2期

页      面：025802-025802页

核心收录：

基　　金：RIKEN Japan Society for the Promotion of Science, JSPS, (JP23K03426, JP23H04526, JP22K20372, JP24K06925, JP18H05406, JP23K26538, JP24K17057, JP22K13981, JP23K22485, JP23K25864, JP22H01158, JP23H01845, JP22H01214) Japan Society for the Promotion of Science, JSPS 

摘      要：We theoretically investigate quasiparticle properties of a neutron immersed in an alpha condensate, which is one of the possible states of dilute symmetric nuclear matter. The resonant p-wave neutron-alpha scattering, which plays a crucial role in forming halo nuclei, is considered. This system is similar to a Bose polaron near the p-wave Feshbach resonance that can be realized in cold-atomic experiments. Calculating the self-energy within the field-theoretical approach, we give an analytical formula for the effective mass of a polaronic neutron as a function of alpha condensation density. Moreover, two adjacent neutrons in a medium, each of which behaves like a stable polaron having an enhanced effective mass, can form a bound dineutron, with the help of S01 neutron-neutron attraction. This is in contrast to the case of the vacuum, where a dineutron is known to be unbound. Our result is useful for understanding many-body physics in astrophysical environments as well as the formation of multinucleon clusters in neutron-halo nuclei.