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

反転の島へ移るNe原子核のintruder配位; Neの詳細な構造研究

Wang, H.*; 安田 昌弘*; 近藤 洋介*; 中村 隆司*; Tostevin, J. A.*; 緒方 一介*; 大塚 孝治*; Poves, A.*; 清水 則孝*; 吉田 数貴   ; Achouri, N. L.*; Al Falou, H.*; Atar, L.*; Aumann, T.*; 馬場 秀忠*; Boretzky, K.*; Caesar, C.*; Calvet, D.*; Chae, H.*; 千賀 信幸*; 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.*; 平山 晃大*; Hoffman, C. R.*; Holl, M.*; Horvat, A.*; Horvth, *; Hwang, J. W.*; 磯部 忠昭*; Kahlbow, J.*; Kalantar-Nayestanaki, N.*; 川瀬 頌一郎* ; Kim, S.*; 木佐森 慶一*; 小林 俊雄*; Krper, D.*; 小山 俊平*; Kuti, I.*; Lapoux, V.*; Lindberg, S.*; Marqus, F. M.*; 増岡 翔一朗*; Mayer, J.*; 三木 謙二郎*; 村上 哲也*; Najafi, M. A.*; 中野 敬太*; 中塚 徳継*; Nilsson, T.*; Obertelli, A.*; Orr, N. A.*; 大津 秀暁*; 尾崎 友志*; Panin, V.*; Paschalis, S.*; Revel, A.*; Rossi, D.*; 齊藤 敦美*; 齋藤 辰宏*; 笹野 匡紀*; 佐藤 広海*; 佐藤 義輝*; Scheit, H.*; Schindler, F.*; Schrock, P.*; 四方 瑞紀*; 清水 陽平*; Simon, H.*; Sohler, D.*; Sorlin, O.*; Stuhl, L.*; 武内 聡*; Tanaka, M.*; Thoennessen, M.*; Trnqvist, H.*; 栂野 泰宏*; 斗米 貴人*; Tscheuschner, J.*; 坪田 潤一*; 上坂 友洋*; Yang, Z.*; 米田 健一郎*

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*

Neからの1中性子除去反応を用いて、Neの詳細な線分光を行った。平行運動量分布の解析に基づき、Neの準位構造とスピンパリティを決定し、初めて負のパリティ状態を同定した。測定された断面積と運動量分布から、N=20とN=28のシェルギャップの消失の証拠となる有意なintruder p-wave強度が明らかになった。束縛状態については、弱いf-waveの可能性のある強度が観測された。いくつかの有効相互作用を用いた大規模殻模型計算では、実験的に観測された大きなp-wave強度と小さなf-wave強度は再現されず、Ne同位体に沿った反転の島への遷移の完全な理論的記述への挑戦が続いていることを示している。

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.