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southwestern boundary of the N=40 island of inversion: First study of low-lying bound excited states in v 59 and v 61

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Title: southwestern boundary of the N=40 island of inversion: First study of low-lying bound excited states in v 59 and v 61

Author(s): Elekes, Z.; Juhász, M.M.; Sohler, D.; Sieja, K.; Yoshida, K.; Ogata, K.; Doornenbal, P.; Obertelli, A.; Achouri, N.L.; Baba, H.; Browne, F.; Calvet, D.; Château, F.; Chen, S.; Chiga, N.; Corsi, A.; Cortés, M.L.; Delbart, A.; Gheller, J.-M.; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V.; Liu, H.N.; Motobayashi, T.; Murray, I.; Otsu, H.; Panin, V.; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Laszlo STUHL; Sun, Y.L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L.X.; Dombrádi, Z.; Flavigny, F.; Franchoo, S.; Gašparić, I.; Gerst, R.-B.; Gibelin, J.; Kevin Insik Hahn; Da Hee KIM; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B.D.; Lokotko, T.; Maccormick, M.; Moschner, K.; Nakamura, T.; Park, S.Y.; Rossi, D.; Sahin, E.; Söderström, P.-A.; Takeuchi, S.; Törnqvist, H.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.; Sunflower Collaboration

Abstract: The low-lying level structure of V59 and V61 was investigated for the first time. The neutron knockout reaction and inelastic proton scattering were applied for V61 while the neutron knock-out reaction provided the data for V59. Four and five new transitions were determined for V59 and V61, respectively. Based on the comparison to our shell-model calculations using the Lenzi-Nowacki-Poves-Sieja (LNPS) interaction, three of the observed γ rays for each isotope could be placed in the level scheme and assigned to the decay of the first 11/2- and 9/2- levels. The (p,p′) excitation cross sections for V61 were analyzed by the coupled-channels formalism assuming quadrupole plus hexadecapole deformations. Due to the role of the hexadecapole deformation, V61 could not be unambiguously placed on the island of inversion. © 2022 American Physical Society.