How Robust is the N = 34 Subshell Closure? First Spectroscopy of 52Ar

Liu, H. N.; Obertelli, A.; Doornenbal, P.; Bertulani, C. A.; Hagen, G.; Holt, J. D.; Jansen, G. R.; Morris, T. D.; Schwenk, A.; Stroberg, R.; Achouri, N.; 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.; Motobayashi, T.; Murray, I.; Otsu, H.; Panin, V.; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Stuhl, L.; Sun, Y. L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L. X.; Flavigny, F.; Franchoo, S.; Gašparić, I.; Gerst, R. -B.; Gibelin, J.; Hahn, K. I.; Kim, D.; 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.; Sohler, D.; 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.

doi:10.1103/PhysRevLett.122.072502

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How Robust is the N = 34 Subshell Closure? First Spectroscopy of ⁵²Ar

MPS-Authors

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Schwenk, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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引用

Liu, H. N., Obertelli, A., Doornenbal, P., Bertulani, C. A., Hagen, G., Holt, J. D., Jansen, G. R., Morris, T. D., Schwenk, A., Stroberg, R., Achouri, N., 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., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Chung, L. X., Flavigny, F., Franchoo, S., Gašparić, I., Gerst, R.-.-B., Gibelin, J., Hahn, K. I., Kim, D., 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., Sohler, D., 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. (2019). How Robust is the N = 34 Subshell Closure? First Spectroscopy of ⁵²Ar. Physical Review Letters, 122(7):. doi:10.1103/PhysRevLett.122.072502.

引用: https://hdl.handle.net/21.11116/0000-0004-F206-4

要旨

The first $\gamma$-ray spectroscopy of $^{52}$Ar, with the neutron number N =
34, was measured using the $^{53}$K(p,2p) one-proton removal reaction at
$\sim$210 MeV/u at the RIBF facility. The 2$^{+}_{1}$ excitation energy is
found at 1656(18) keV, the highest among the Ar isotopes with N $>$ 20. This
result is the first experimental signature of the persistence of the N = 34
subshell closure beyond $^{54}$Ca, i.e., below the magic proton number Z = 20.
Shell-model calculations with phenomenological and
chiral-effective-field-theory interactions both reproduce the measured
2$^{+}_{1}$ systematics of neutron-rich Ar isotopes, and support a N = 34
subshell closure in $^{52}$Ar.