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How different is the core of $$^{25}$$F from $$^{24}$$O$$_{g.s.}$$ ?

Tang, T. L.*; Uesaka, Tomohiro*; Kawase, Shoichiro ; Beaumel, D.*; Dozono, Masanori*; Fujii, Toshihiko*; Fukuda, Naoki*; Fukunaga, Taku*; Galindo-Uribarri. A.*; Hwang, S. H.*; Inabe, Naoto*; Kameda, Daisuke*; Kawahara, T.*; Kim, W.*; Kisamori, Keiichi*; Kobayashi, Motoki*; Kubo, Toshiyuki*; Kubota, Yuki*; Kusaka, Kensuke*; Lee, C. S.*; Maeda, Yukishige*; Matsubara, Hiroaki*; Michimasa, Shinichiro*; Miya, Hioyuki*; Noro, Tetsuo*; Obertelli, A.*; Ogata, Kazuyuki*; Ota, Shinsuke*; Padilla-Rodal, E.*; Sakaguchi, Satoshi*; Sakai, Hideyuki*; Sasano, Masaki*; Shimoura, Susumu*; Stepanyan, S. S.*; Suzuki, Hiroshi*; Takaki, Motonobu*; Takeda, Hiroyuki*; Tokieda, Hiroshi*; Wakasa, Tomotsugu*; Wakui, Takashi*; Yako, Kentaro*; Yanagisawa, Yoshiyuki*; Yasuda, Jumpei*; Yokoyama, Rin*; Yoshida, Koichi*; Yoshida, Kazuki; Zenihiro, Juzo*

The structure of a neutron-rich $$^{25}$$F nucleus is investigated by a quasifree ($$p,2p$$) knockout reaction. The sum of spectroscopic factors of $$pi 0d_{5/2}$$ orbital is found to be 1.0 $$pm$$ 0.3. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus, and the core consists of $$sim$$35% $$^{24}$$O$$_{rm g.s.}$$, and $$sim$$65% excited $$^{24}$$O. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus. The result may infer that the addition of the $$0d_{5/2}$$ proton considerably changes the neutron structure in $$^{25}$$F from that in $$^{24}$$O, which could be a possible mechanism responsible for the oxygen dripline anomaly.

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Category:Physics, Multidisciplinary

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