1. Evolution of deformation in neutron-rich Ba isotopes up to A=150.
- Author
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Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., 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, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., Tengblad, Olof, Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., 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, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., and Tengblad, Olof
- Abstract
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.
- Published
- 2018