Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Wang, H.; Yasuda, M.; Kondo, Y.; Nakamura, T.; Tostevin, J.A.; Ogata, K.; Otsuka, T.; Poves, A.; Shimizu, N.; Yoshida, K.; 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.; Dombrádi, Zs.; Douma, C.; Elekes, Z.; Fallon, P.; Gašparić, Igor; Gheller, J.-M.; Gibelin, J.; Gillibert, A.; Harakeh, M.N.; Hirayama, A.; Hoffman, C.R.; Holl, M.; 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.; Kutir, I.; Lapoux, V.; Lindberg, S.; Marqués, F.M.; Masuoka, S.; Mayer, J.; Miki, K.; Murakami, T.; Najafi, M.A.; Nakano, K.; Nakatsuka, N.; Nilsson, T.; Obertelli, A.; Orr, N.A.; Otsu, H.; Ozaki, T.; Panin, V.; Paschalis, S.; Revel, A.; Rossi, D.; Saito, A.T.; Saito, T.; 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.; Yoneda, K. (2023) Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne. Physics Letters B, 843 . ISSN 0370-2693

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Abstract

Detailed ?-ray spectroscopy of the exotic neon isotope Ne-28 has been performed for the first time using the one-neutron removal reaction from Ne-29 on a liquid hydrogen target at 240 MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for Ne-28 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.

Item Type:	Article
Uncontrolled Keywords:	in-beam γ-ray spectroscopy; island of inversion; shell evolution
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields NATURAL SCIENCES > Physics > Nuclear Physics NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions:	Division of Experimental Physics
Depositing User:	Josipa Karadžole
Date Deposited:	05 May 2026 06:50
URI:	https://fulir.irb.hr:/id/eprint/11888
DOI:	10.1016/j.physletb.2023.138038

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