First observation of 28O

Kondo, Y. and Achouri, N. L. and Falou, H. Al and Atar, L. and Aumann, T. and Baba, H. and Boretzky, K. and Caesar, C. and Calvet, D. and Chae, H. and Chiga, N. and Corsi, A. and Delaunay, F. and Delbart, A. and Deshayes, Q. and Dombrádi, Zs. and Douma, C. A. and Ekström, A. and Elekes, Z. and Forssén, C. and Gašparić, I. and Gheller, J.-M. and Gibelin, J. and Gillibert, A. and Hagen, G. and Harakeh, M. N. and Hirayama, A. and Hoffman, C. R. and Holl, M. and Horvat, A. and Horváth, Á. and Hwang, J. W. and Isobe, T. and Jiang, W. G. and Kahlbow, J. and Kalantar-Nayestanaki, N. and Kawase, S. and Kim, S. and Kisamori, K. and Kobayashi, T. and Körper, D. and Koyama, S. and Kuti, I. and Lapoux, V. and Lindberg, S. and Marqués, F. M. and Masuoka, S. and Mayer, J. and Miki, K. and Murakami, T. and Najafi, M. and Nakamura, T. and Nakano, K. and Nakatsuka, N. and Nilsson, T. and Obertelli, A. and Ogata, K. and de Oliveira Santos, F. and Orr, N. A. and Otsu, H. and Otsuka, T. and Ozaki, T. and Panin, V. and Papenbrock, T. and Paschalis, S. and Revel, A. and Rossi, D. and Saito, A. T. and Saito, T. Y. and Sasano, M. and Sato, H. and Satou, Y. and Scheit, H. and Schindler, F. and Schrock, P. and Shikata, M. and Shimizu, N. and Shimizu, Y. and Simon, H. and Sohler, D. and Sorlin, O. and Stuhl, L. and Sun, Z. H. and Takeuchi, S. and Tanaka, M. and Thoennessen, M. and Törnqvist, H. and Togano, Y. and Tomai, T. and Tscheuschner, J. and Tsubota, J. and Tsunoda, N. and Uesaka, T. and Utsuno, Y. and Vernon, I. and Wang, H. and Yang, Z. and Yasuda, M. and Yoneda, K. and Yoshida, S. (2023) First observation of 28O. Nature, 620 (7976). pp. 965-970. ISSN 0028-0836

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Abstract

Subjecting a physical system to extreme conditions is one of the means often used to obtain a better understanding and deeper insight into its organization and structure. In the case of the atomic nucleus, one such approach is to investigate isotopes that have very different neutron-to-proton (N/Z) ratios than in stable nuclei. Light, neutron-rich isotopes exhibit the most asymmetric N/Z ratios and those lying beyond the limits of binding, which undergo spontaneous neutron emission and exist only as very short-lived resonances (about 10−21 s), provide the most stringent tests of modern nuclear-structure theories. Here we report on the first observation of 28O and 27O through their decay into 24O and four and three neutrons, respectively. The 28O nucleus is of particular interest as, with the Z = 8 and N = 20 magic numbers1,2, it is expected in the standard shell-model picture of nuclear structure to be one of a relatively small number of so-called ‘doubly magic’ nuclei. Both 27O and 28O were found to exist as narrow, low-lying resonances and their decay energies are compared here to the results of sophisticated theoretical modelling, including a large-scale shell-model calculation and a newly developed statistical approach. In both cases, the underlying nuclear interactions were derived from effective field theories of quantum chromodynamics. Finally, it is shown that the cross-section for the production of 28O from a 29F beam is consistent with it not exhibiting a closed N = 20 shell structure.

Item Type: Article
Subjects: STM Academic > Multidisciplinary
Depositing User: Unnamed user with email support@stmacademic.com
Date Deposited: 14 Nov 2023 07:36
Last Modified: 14 Nov 2023 07:36
URI: http://article.researchpromo.com/id/eprint/1793

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