Refined Topology of the N=20 Island of Inversion with High Precision Mass Measurements of ^{31-33}Na and ^{31-35}Mg.

• Tác giả: J Bergmann, M Brodeur, C Brown, J Cardona, A Czihaly, T Dickel, J Dilling, T Duguet, J-P Ebran, M Frosini, Z Hockenbery, J D Holt, A Jacobs, S Kakkar, B Kootte, A A Kwiatkowski, D Lunney, E M Lykiardopoulou, T Miyagi, A Mollaebrahimi, T Murboeck, P Navratil, T Otsuka, S Paul, W R Plaß, W S Porter, M P Reiter, A Scalesi, C Scheidenberger, N Shimizu, V Somà, C Walls, Y Wang
• Ngôn ngữ: eng
• Ký hiệu phân loại: 782.3235 *Services (Liturgy and ritual)
• Thông tin xuất bản: United States : Physical review letters , 2025
• Bộ sưu tập: NCBI
• ID: 473995

Tóm tắt

Mass measurements of ^{31-33}Na and ^{31-35}Mg using the TITAN MR-TOF-MS at TRIUMF's ISAC facility are presented, with the uncertainty of the ^{33}Na mass reduced by over 2 orders of magnitude. The excellent performance of the MR-TOF-MS has also allowed the discovery of a millisecond isomer in ^{32}Na. The precision obtained shows that the binding energy of the normally closed N=20 neutron shell reaches a minimum for ^{32}Mg but increases significantly for ^{31}Na, hinting at the possibility of enhanced shell strength toward the unbound ^{28}O. We compare the results with new ab initio predictions that raise intriguing questions of nuclear structure beyond the dripline.