[en] A brief description of He-Jet coupled to a medium current mass separator source are given and then the results obtained since the facility is in operation. Up to now seven new neutron-deficient isotopes with N<82 and Z>50 have been identified and most of their β-decay properties have been recently published. The location of these isotopes in the chart of nuclides are shown. In this paper the new experimental results are given mainly and to extract some structural effects by analyzing the evolution of low-lying energy levels along particular systematics (the Eu-Sm and the La-Ba regions are considered)

[en] Levels in /sup 136,138,140/Sm were populated by the beta decay of Eu, following (HI,pxn) reactions and on-line mass separation. Members of the γ band were observed in all three daughter nuclei. Spectroscopic calculations were made using the triaxial rotor model, with all parameters derived microscopically from a Woods-Saxon deformed shell model. Comparison with the data supports the characterization of these nuclei in terms of a triaxial intrinsic shape. Improved decay schemes for /sup 132,134,136/Nd are given. 3 refs., 7 figs

[en] The remote region of deformation in the very light rare earth region has been investigated by observation of the decay of ¹³⁸Eu and ¹³⁶Eu. These nuclei were produced with ⁴⁸Ti beams incident on ⁹²Mo targets and mass separated on-line at the UNISOR facility. Fifteen gamma rays associated with a 12 +- 1 s activity attributed to ¹³⁸Eu decay have been identified and ten of these placed in a decay scheme. The 2+→0+ transition in ¹³⁶Sm has also been identified. These results are compared to IBM2 and cranking model predictions

[en] The remote region of deformation in the very light rare earth region has been investigated by observation of the decay of /sup 138/Eu and /sup 136/Eu. These nuclei were produced with /sup 48/Ti beams incident on /sup 92/Mo targets and mass separated on-line at the UNISOR facility. Fifteen gamma rays associated with a 12+-1 s activity attributed to /sup 138/ decay have been identified and ten of these placed in a decay scheme. The 2+→0+ transition in /sup 136/Sm has also been identified. These results are compared to IBM2 and cranking model predictions

[en] Activities produced via fusion-evaporation reactions with ³²S, ³⁵Cl and ³⁶Ar beams in thin ¹¹²Sn and ¹⁰⁶Cd targets have been transported using a He-jet coupled to a mass separator. Gamma-ray and X-ray techniques have been used to study the excited levels of ¹³⁸Sm, ¹³⁶Sm and ¹³⁴Nd, ¹³²Nd fed in the β-decay of ¹³⁸Eu(12 s), ¹³⁶Eu(3.7 s), ¹³⁴Pm (21 s) and ¹³²Pm (5 s). Results are presented through systematics and discussed in the framework of recent self-consistent calculations including the γ degree of freedom

[en] Spectroscopic data for all nuclei with mass number A=136 have been evaluated and the corresponding level schemes from radioactive decay and reaction studies are presented. No excited states are known in ¹³⁶In, ¹³⁶Eu, or ¹³⁶Gd and ¹³⁶Tb remains unidentified. Discrepancies between experiments on isomeric decays in ¹³⁶Sb and ¹³⁶La suggest the need for futher experimental investigation. The decay of ¹³⁶Eu has only been observed in a mixed source. The energy of the 17.5 s isomer in ¹³⁶Cs was determined since the last evaluation, however, the branching ratio remains unknown. This work supersedes the earlier full evaluation of A=136 by A.A. Sonzogni (2002So05), and benefited tremendously from all previous evaluations of A=136.

[en] Proton rich exotic nuclei of rare-earth have been identified and their low-energy structure studied with the system of He-jet fed on-line mass separator recently put into operation at the SARA accelerator. In order to investigate the triaxial stability of the deformed ground states in the e-e exotic Samarium isotopes, lattice Hartree-Fock + BCS calculations have been performed

[en] Fusion-evaporation reactions with ³²S, ³⁵Cl and ³⁶Ar beams on ⁹²Mo, ¹⁰⁶Cd and ¹¹²Sn targets have been used to search for new activities. The reaction products transported via a He-Jet system coupled to a mass-separator for mass identification have been studied by γ-ray and X-ray spectroscopy techniques. Decay schemes of at least seven new isotopes have been derived. Data are presented through systematics and compared to recent theoretical calculations

[en] The 1987 evaluation of A = 136 has been revised using experimental decay and reaction data received by January 13, 1993

[en] The β-delayed proton and γ-ray decays of the two new isotopes ^134,135Eu and of ¹³⁶Eu, ^134,135,136Sm, ^134,135,136Pm and ¹³⁵Nd were studied. This is the first observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5±0.2 s and 1.5±0.2 s were measured for ¹³⁴Eu and ¹³⁵Eu respectively. For ¹³⁶Eu evidence for two isomers with half-lives of 3.7±0.3 s and ≅ 3.0 s was obtained. Beta-delayed proton emission was assigned to the decays of ¹³⁴Eu, ¹³⁵Sm and ¹³⁶Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3)x10^-4 for ¹³⁶Eu and (2±1)x10^-4 for ¹³⁵Sm were measured. Beta-delayed proton emission to the 0⁺ ground and to the 2⁺ excited states in ¹³⁴Nd was observed following the ¹³⁵Sm decay. The ¹³⁵Eu activity was identified by Sm K_α X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0⁺→1⁺ β-transitions to the 118.9 keV level in ¹³⁴Pm and 114.4 keV level in ¹³⁶Pm were identified. The low-spin β-decays of ¹³⁶Pm and ¹³⁵Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for ¹³⁴,¹³⁵,¹³⁶Sm, ^134,135,136Pm and ¹³⁶Eu. (orig.)