Intruder configurations in Ne at the transition into the island of inversion; Detailed structure study of Ne

Wang, H.*; Yasuda, Masahiro*; Kondo, Yosuke*; Nakamura, Takashi*; Tostevin, J. A.*; Ogata, Kazuyuki*; Otsuka, Takaharu*; Poves, A.*; Shimizu, Noritaka*; Yoshida, Kazuki   ; Achouri, N. L.*; Al Falou, H.*; Atar, L.*; Aumann, T.*; Baba, Hidetada*; Boretzky, K.*; Caesar, C.*; Calvet, D.*; Chae, H.*; Chiga, Nobuyuki*; Corsi, A.*; Crawford, H. L.*; Delaunay, F.*; Delbart, A.*; Deshayes, Q.*; Dombrdi, Zs.*; Douma, C.*; Elekes, Z.*; Fallon, P.*; Gapari, I.*; Gheller, J.-M.*; Gibelin, J.*; Gillibert, A.*; Harakeh, M. N.*; Hirayama, Akihiro*; Hoffman, C. R.*; Holl, M.*; Horvat, A.*; Horvth, *; Hwang, J. W.*; Isobe, Tadaaki*; Kahlbow, J.*; Kalantar-Nayestanaki, N.*; Kawase, Shoichiro* ; Kim, S.*; Kisamori, Keiichi*; Kobayashi, Toshio*; Krper, D.*; Koyama, Shumpei*; Kuti, I.*; Lapoux, V.*; Lindberg, S.*; Marqus, F. M.*; Masuoka, Shoichiro*; Mayer, J.*; Miki, Kenjiro*; Murakami, Tetsuya*; Najafi, M. A.*; Nakano, Keita*; Nakatsuka, Noritsugu*; Nilsson, T.*; Obertelli, A.*; Orr, N. A.*; Otsu, Hideaki*; Ozaki, Tomoyuki*; Panin, V.*; Paschalis, S.*; Revel, A.*; Rossi, D.*; Saito, Atsumi*; Saito, Tatsuhiro*; Sasano, Masaki*; Sato, Hiromi*; Sato, Yoshiteru*; Scheit, H.*; Schindler, F.*; Schrock, P.*; Shikata, Mizuki*; Shimizu, Yohei*; Simon, H.*; Sohler, D.*; Sorlin, O.*; Stuhl, L.*; Takeuchi, Satoshi*; Tanaka, M.*; Thoennessen, M.*; Trnqvist, H.*; Togano, Yasuhiro*; Tomai, Takato*; Tscheuschner, J.*; Tsubota, Junichi*; Uesaka, Tomohiro*; Yang, Z.*; Yoneda, Kenichiro*

Detailed -ray spectroscopy of the exotic neon isotope Ne has been performed using the one-neutron removal reaction from Ne. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for Ne 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.