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

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

Author(s): Wang, H.; Yasuda, M.; Kondo, Y.; Nakamura, T.; Tostevin, J.A.; Ogata, K.; Otsuka, T.; Poves, A.; Shimizu, N.; Yoshida, K.; Achouri, N.L.; Al, Falou H.; Atar, L.; Aumann, T.; Baba, H.; Boretzky, K.; Caesar, C.; Calvet, D.; Chae, H.; Chiga, N.; Corsi, A.; Crawford, H.L.; Delaunay, F.; Delbart, A.; Deshayes, Q.; Dombrádi, Zs.; Douma, C.; Elekes, Z.; Fallon, P.; Gasparic, I.; Gheller, J.-M.; Gibelin, J.; Gillibert, A.; Harakeh, M.N.; Hirayama, A.; Hoffman, C.R.; Holl, M.; Horvat, A.; Horvath, A.; Jongwon Hwang; Isobe, T.; Kahlbow, J.; Kalantar-Nayestanaki, N.; Kawase, S.; S. Kim; Kisamori, K.; Kobayashi, T.; Korper, D.; Koyama, S.; Kuti, I.; Lapoux, V.; Lindberg, S.; Marques, F.M.; Masuoka, S.; Mayer, J.; Miki, K.; Murakami, T.; Najafi, M.A.; Nakano, K.; Nakatsuka, N.; Nilsson, T.; Obertelli, A.; Orr, N.A.; Otsu, H.; Ozaki, T.; Panin, V.; Paschalis, S.; Revel, A.; Rossi, D.; Saito, A.T.; Saito, T.; Sasano, M.; Sato, H.; Satou, Y.; Scheit, H.; Schindler, F.; Schrock, P.; Shikata, M.; Shimizu, Y.; Simon, H.; Sohler, D.; Sorlin, O.; L. Stuhl; Takeuchi, S.; Tanaka, M.; Thoennessen, M.; Tornqvist, H.; Togano, Y.; Tomai, T.; Tscheuschner, J.; Tsubota, J.; Uesaka, T.; Yang, Z.; Yoneda, K.

Journal: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v.843

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. © 2023 The Author(s)