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Border of the island of inversion: Unbound states in Ne-29

(SAMURAI21 Collaboration) Holl, M.; Lindberg, S.; Heinz, A.; Kondo, Y.; Nakamura, T.; Tostevin, J. A.; Wang, H.; Nilsson, T.; Achouri, N. L.; Al Falou, H.; 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.; Díaz Fernández, P.; Dombrádi, Z.; Douma, C. A.; Elekes, Z.; Fallon, P.; Gašparić, Igor; Gheller, J.-M.; Gibelin, J.; Gillibert, A.; Harakeh, M. N.; Hirayama, A.; Hoffman, C. R.; 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.; Marqués, F. M.; Masuoka, S.; Mayer, J.; Miki, K.; Murakami, T.; Najafi, M.; Nakano, K.; Nakatsuka, N.; Obertelli, A.; de Oliveira Santos, F.; Orr, N. A.; Otsu, H.; Ozaki, T.; Panin, V.; Paschalis, S.; Revel, A.; Rossi, D.; Saito, A. T.; Saito, T. Y.; 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.; Yasuda, M.; Yoneda, K. (2022) Border of the island of inversion: Unbound states in Ne-29. Physical review. C, 105 (3). ISSN 2469-9985

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The nucleus Ne-29 is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder f(7/2) state, which would place Ne-29 firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of Ne- 29 is reported. The states were populated in Ne-30(p, pn) and Na- 30(p, 2p) reactions at a beam energy of around 230 MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections, and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing assignments for the observed states. The lowest lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant l = 3 component, giving first evidence for f(7/2) single particle strength in Ne-29. The excitation energies and strengths of the observed states are compared to shell-model calculations using the SDPF-U-MIX interaction.

Item Type: Article
Uncontrolled Keywords: Nuclear structure ; direct reactions ; radioactive beams
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Depositing User: Igor Gašparić
Date Deposited: 04 Apr 2023 13:43
DOI: 10.1103/PhysRevC.105.034301

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