Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Wang, H. and Yasuda, M. and Kondo, Y. and Nakamura, T. and Tostevin, J.A. and Dombrádi, Zs. and Elekes, Z. and Horváth, Á. and Kuti, I. and Sohler, D. and Stuhl, L. (2023) Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne. PHYSICS LETTERS B, 843. No-138038. ISSN 0370-2693

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Abstract

Detailed γ -ray spectroscopy of the exotic neon isotope 28Ne has been performed for the first time using the one-neutron removal reaction from 29Ne on a liquid hydrogen target at 240 MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for 28Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N = 20 and N = 28 shell gaps. Only a weak, possible f -wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f -wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

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