학술논문
Intruder configurations in $^{29}$Ne at the transition into the island of inversion: Detailed structure study of $^{28}$Ne
Document Type
Working Paper
Author
Wang, H.; Yasuda, M.; Kondo, Y.; Nakamura, T.; Tostevin, J. A.; Ogata, K.; Otsuka, T.; Poves, A.; Shimizu, N.; Yoshida, K.; Achouri, N. L.; Falou, H. Al; 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.; Gašparić, I.; Gheller, J. -M.; Gibelin, J.; Gillibert, A.; Harakeh, M. N.; Hirayama, A.; Hoffman, C. R.; Holl, M.; Horvat, A.; Horváth, Á.; Hwang, J. W.; 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, F. M.; Masuoka, S.; Mayer, J.; Miki, K.; Murakami, T.; Najafi, M. A.; Nakano, K.; Nakatsuka, N.; Nilsson, T.; Obertelli, A.; Santos, F. de Oliveira; 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.; Stuhl, L.; Takeuchi, S.; Tanaka, M.; Thoennessen, M.; Törnqvist, H.; Togano, Y.; Tomai, T.; Tscheuschner, J.; Tsubota, J.; Uesaka, T.; Yang, Z.; Yoneda, K.
Source
Phys.Lett.B 843 (2023) 138038
Subject
Language
Abstract
Detailed $\gamma$-ray spectroscopy of the exotic neon isotope $^{28}$Ne has been performed for the first time using the one-neutron removal reaction from $^{29}$Ne 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 $^{28}$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.