학술논문
Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne
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article
Author
Wang, H; Yasuda, M; Kondo, Y; Nakamura, T; Tostevin, JA; Ogata, K; Otsuka, T; Poves, A; Shimizu, N; Yoshida, K; Achouri, NL; Falou, H Al; Atar, L; Aumann, T; Baba, H; Boretzky, K; Caesar, C; Calvet, D; Chae, H; Chiga, N; Corsi, A; Crawford, HL; Delaunay, F; Delbart, A; Deshayes, Q; Dombrádi, Zs; Douma, C; Elekes, Z; Fallon, P; Gašparić, I; Gheller, J-M; Gibelin, J; Gillibert, A; Harakeh, MN; Hirayama, A; Hoffman, CR; Holl, M; Horvat, A; Horváth, Á; Hwang, JW; Isobe, T; Kahlbow, J; Kalantar-Nayestanaki, N; Kawase, S; Kim, S; Kisamori, K; Kobayashi, T; Körper, D; Koyama, S; Kuti, I; Lapoux, V; Lindberg, S; Marqués, FM; Masuoka, S; Mayer, J; Miki, K; Murakami, T; Najafi, MA; Nakano, K; Nakatsuka, N; Nilsson, T; Obertelli, A; Orr, NA; Otsu, H; Ozaki, T; Panin, V; Paschalis, S; Revel, A; Rossi, D; Saito, AT; Saito, T; Sasano, M; Sato, H; Satou, Y; Scheit, H; Schindler, F; Schrock, P; Shikata, M; Shimizu, Y; Simon, H; Sohler, D; Sorlin, O; Stuhl, L; Takeuchi, S; Tanaka, M; Thoennessen, M; Törnqvist, H; Togano, Y; Tomai, T; Tscheuschner, J; Tsubota, J; Uesaka, T; Yang, Z; Yoneda, K
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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.