Evolution of deformation in neutron-rich Ba isotopes up to A=150
| Autor: | Lica, R., Benzoni, G., Rodriguez, T. R., Borge, M. J. G., Fraile, L. M., Mach, H., Morales, A. I., Madurga, M., Sotty, C. O., Vedia, V., De Witte, H., Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka-Orynczak, N., Costache, C., Crespi, F. C. L., Creswell, J., Fernandez-Martinez, G., Fynbo, H., Greenlees, P. T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Koster, U., Konki, J., Kroell, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I., Lund, M. V., Arginean, N. M., Marginean, R., Mihai, C., Mihai, R. E., Negret, A., Orduz, A., Patyk, Z., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Regis, J. M., Robledo, L. M., Rotaru, F. |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Lica, R, Benzoni, G, Rodriguez, T R, Borge, M J G, Fraile, L M, Mach, H, Morales, A I, Madurga, M, Sotty, C O, Vedia, V, De Witte, H, Benito, J, Bernard, R N, Berry, T, Bracco, A, Camera, F, Ceruti, S, Charviakova, V, Cieplicka-Orynczak, N, Costache, C, Crespi, F C L, Creswell, J, Fernandez-Martinez, G, Fynbo, H, Greenlees, P T, Homm, I, Huyse, M, Jolie, J, Karayonchev, V, Koster, U, Konki, J, Kroell, T, Kurcewicz, J, Kurtukian-Nieto, T, Lazarus, I, Lund, M V, Arginean, N M, Marginean, R, Mihai, C, Mihai, R E, Negret, A, Orduz, A, Patyk, Z, Pascu, S, Pucknell, V, Rahkila, P, Rapisarda, E, Regis, J M, Robledo, L M, Rotaru, F & IDS Collaboration 2018, ' Evolution of deformation in neutron-rich Ba isotopes up to A=150 ', Physical Review C (Nuclear Physics), vol. 97, no. 2, 024305 . https://doi.org/10.1103/PhysRevC.97.024305 |
| Popis: | The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character. |
| Databáze: | OpenAIRE |
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