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Pairing forces govern population of doubly magic $$^{54}$$Ca from direct reactions

ペアリング相互作用が支配する直接反応による二重魔法核$$^{54}$$Caの生成

Browne, F.*; Chen, S.*; Doornenbal, P.*; Obertelli, A.*; 緒方 一介*; 宇都野 穣  ; 吉田 数貴  ; Achouri, N. L.*; 馬場 秀忠*; Calvet, D.*; Ch$^a$teau, F.*; 千賀 信幸*; Corsi, A.*; Cort$'e$s, M. L.*; Delbart, A.*; Gheller, J.-M.*; Giganon, A.*; Gillibert, A.*; Hilaire, C.*; 磯部 忠昭*; 小林 俊雄*; 久保田 悠樹*; Lapoux, V.*; Liu, H. N.*; 本林 透*; Murray, I.*; 大津 秀暁*; Panin, V.*; Paul, N.*; Rodriguez, W.*; 櫻井 博儀*; 笹野 匡紀*; Steppenbeck, D.*; Stuhl, L.*; Sun, Y. L.*; 栂野 泰宏*; 上坂 友洋*; Wimmer, K.*; 米田 健一郎*; Aktas, O.*; Aumann, T.*; Boretzky, K.*; Caesar, C.*; Chung, L. X.*; Flavigny, F.*; Franchoo, S.*; Gasparic, I.*; Gerst, R.-B.*; Gibelin, J.*; Hahn, K. I.*; Holl, M.*; Kahlbow, J.*; Kim, D.*; K$"o$rper, D.*; 小岩井 拓真*; 近藤 洋介*; Koseoglou, P.*; Lee, J.*; Lehr, C.*; Linh, B. D.*; Lokotko, T.*; MacCormick, M.*; Miki, K.*; Moschner, K.*; 中村 隆司*; Park, S. Y.*; Rossi, D.*; Sahin, E.*; Schindler, F.*; Simon, H.*; S$"o$derstr$"o$m, P.-A.*; Sohler, D.*; 武内 聡*; T$"o$rnqvist, H.*; Tscheuschner, J.*; Vaquero, V.*; Wagner, V.*; Wang, S.*; Werner, V.*; Xu, X.*; 山田 啓貴*; Yan, D.*; Yang, Z.*; 安田 昌弘*; Zanetti, L.*

Browne, F.*; Chen, S.*; Doornenbal, P.*; Obertelli, A.*; Ogata, Kazuyuki*; Utsuno, Yutaka; Yoshida, Kazuki; Achouri, N. L.*; Baba, Hidetada*; Calvet, D.*; Ch$^a$teau, F.*; Chiga, Nobuyuki*; Corsi, A.*; Cort$'e$s, M. L.*; Delbart, A.*; Gheller, J.-M.*; Giganon, A.*; Gillibert, A.*; Hilaire, C.*; Isobe, Tadaaki*; Kobayashi, Toshio*; Kubota, Yuki*; Lapoux, V.*; Liu, H. N.*; Motobayashi, Toru*; Murray, I.*; Otsu, Hideaki*; Panin, V.*; Paul, N.*; Rodriguez, W.*; Sakurai, Hiroyoshi*; Sasano, Masaki*; Steppenbeck, D.*; Stuhl, L.*; Sun, Y. L.*; Togano, Yasuhiro*; Uesaka, Tomohiro*; Wimmer, K.*; Yoneda, Kenichiro*; Aktas, O.*; Aumann, T.*; Boretzky, K.*; Caesar, C.*; Chung, L. X.*; Flavigny, F.*; Franchoo, S.*; Gasparic, I.*; Gerst, R.-B.*; Gibelin, J.*; Hahn, K. I.*; Holl, M.*; Kahlbow, J.*; Kim, D.*; K$"o$rper, D.*; Koiwai, Takuma*; Kondo, Yosuke*; Koseoglou, P.*; Lee, J.*; Lehr, C.*; Linh, B. D.*; Lokotko, T.*; MacCormick, M.*; Miki, K.*; Moschner, K.*; Nakamura, Takashi*; Park, S. Y.*; Rossi, D.*; Sahin, E.*; Schindler, F.*; Simon, H.*; S$"o$derstr$"o$m, P.-A.*; Sohler, D.*; Takeuchi, Satoshi*; T$"o$rnqvist, H.*; Tscheuschner, J.*; Vaquero, V.*; Wagner, V.*; Wang, S.*; Werner, V.*; Xu, X.*; Yamada, Hiroki*; Yan, D.*; Yang, Z.*; Yasuda, Masahiro*; Zanetti, L.*

理化学研究所RIビームファクトリーにて、中性子過剰核$$^{55}$$Scからの1陽子ノックアウト反応によって$$^{54}$$Caを生成し、そのエネルギー準位と反応断面積をガンマ線分光および不変質量分光によって得た。その結果を歪曲波インパルス近似による核反応計算と大規模殻模型による核構造計算を組み合わせた理論値と比較した。実験の準位と断面積は理論計算によってよく再現された。$$^{54}$$Caの正パリティ状態については、基底状態の生成断面積が励起状態のものに比べて圧倒的に大きいという結果が得られた。これは、$$^{55}$$Scでは中性子魔法数34が消滅し$$^{54}$$Caではその魔法数が存在するというこれまでの知見と一見矛盾するが、対相関による分光学的因子のコヒーレンスから理解することができる。

Direct proton-knockout reactions of $$^{55}$$Sc were studied at the RIKEN Radioactive Isotope Beam Factory. Populated states of $$^{54}$$Ca were investigated through $$gamma$$-ray and invariant-mass spectroscopy. Level energies were calculated from the nuclear shell model employing a phenomenological inter-nucleon interaction. Theoretical cross sections to states were calculated from distorted-wave impulse approximation estimates multiplied by the shell model spectroscopic factors. Despite the calculations showing a significant amplitude of excited neutron configurations in the ground-state of $$^{55}$$Sc, valence proton removals populated predominantly the ground-state of $$^{54}$$Ca. This counter-intuitive result is attributed to pairing effects leading to a dominance of the ground-state spectroscopic factor. Owing to the ubiquity of the pairing interaction, this argument should be generally applicable to direct knockout reactions from odd-even to even-even nuclei.

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