LICĂ, R.; BENZONI, G.; RODRÍGUEZ, 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-ORYŃCZAK, N.; COSTACHE, C.; CRESPI, F.C.L.; CRESWELL, J.; FERNANDEZ-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.; MĂRGINEAN, N.; MĂRGINEAN, 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.; SAED-SAMII, N.; SÁNCHEZ-TEMBLEQUE, V.; STANOIU, M.; TENGBLAD, O.; THUERAUF, M.; TURTURICA, A.; VAN DUPPEN, P.; WARR, N.

doi:10.1103/PhysRevC.97.024305

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Phys.Rev.C. 2018, vol. 97, n° 2, p. 024305

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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, $^{148,150}$Ba, 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 $^{150}$Ba and presents an extension of the $\beta$-decay scheme of $^{148}$Cs. 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 $^{148}$Ba and $T_{1/2}=3.4(2)$ ns for $^{150}$Ba. The systematics of low-spin states, together with the experimental determination of the $B(E2:2^+ \rightarrow 0^+$) transition probabilities, indicate an increasing collectivity in $^{148–150}$Ba, 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.< Réduire

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Evolution of deformation in neutron-rich Ba isotopes up to $A=150$

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