[en] A model and a computer program have been developed to calculate the temperature distribution in the target which will be used in the SPIRAL project at GANIL. The results of the numerical simulation are compared with measurements performed with several types of targets. (author)

No abstract available

[en] Excitation functions of the ⁷⁸Kr(d, α)⁷⁶Br, ⁷⁸Kr(d, n)⁷⁹Rb and ⁷⁸Kr(d, x)⁷⁹Kr reactions were measured for the first time in the energy range up to 13 MeV using the stacked gas cell technique and activation method. Highly enriched ⁷⁸Kr was used as target material. The maximum cross section of the ⁷⁸Kr(d, α)⁷⁶Br reaction at 13 MeV amounts to 21 mb and the calculated yield of ⁷⁶Br over the energy range E_d = 13 → 4 MeV to only 59 kBq/μA h. Due to the very low expected yield of ⁷⁶Br and the high cost of the target gas, this route is not suitable for production of ⁷⁶Br compared with the other well investigated production routes. (orig.)

[en] The effects of the surface energy constant and the surface asymmetry constant in the charged particle emission cross section, have been examined by using the proximity potentials Prox₇₇, BW₉₁, AW₉₅. The charged particle emission cross-section for the reactions ^78,82,86Kr+¹²C have been calculated. Good consistency between the results of this work and the experimental data have been obtained using appropriate values of these constants. (author)

No abstract available

[en] The α decays of the two neutron-deficient nuclei ¹⁷²Hg and ¹⁷³Hg were observed for the first time using the ⁷⁸Kr(⁹⁶Ru,2n) and ⁸⁰Kr(⁹⁶Ru,3n) reactions, respectively. The reaction products were dispersed according to their mass-to-charge state ratios in the Argonne Fragment Mass Analyzer and implanted in a double-sided silicon strip detector, where their subsequent decays were studied using spatial and time correlations between implants and decays. A half-life of 250(_-90⁺³⁵⁰) μs and an energy of 7350(12) keV were deduced for the α decay of ¹⁷²Hg. In ¹⁷³Hg the half-life was measured to be 0.93(_-0.26^+0.57) ms and the corresponding energy is 7211(11) keV. In addition, the half-life and energy of the α decay of ¹⁷⁴Hg were measured more precisely. The reduced widths deduced for these Hg isotopes indicate that the observed decays correspond to unhindered Δl=0 transitions. The α-decay Q values are compared with the values calculated using mass tables by Moeller and Nix, and by Liran and Zeldes. The latter mass tables show better agreement with the data. copyright 1999 The American Physical Society

[en] Full text: A technique based on measuring the perturbations of γ-γ correlations following heavy-ion induced reactions has been used to study gyromagnetic ratios at low and high spin in several nuclear near A=80. The nuclei of interest, ⁷⁸Kr and ⁸¹Sr, were populated following ²⁸Si induced reactions on a natural iron foil that served as both the target and as a ferromagnetic host in which the spins of the excited nuclei were perturbed by intense hyperfine fields. In the A=80 region, the nuclei are soft and have states at similar excitation energies that are associated with different nuclear deformations. For example, in ⁸¹Sr rotational bands with prolate and oblate deformations co-exist. This paper will discuss these and related structures in the light of the new gyromagnetic ratio data

No abstract available

No abstract available

[en] Excitation functions were measured by the stacked-foil technique for ⁶⁴Ni(p,α)⁶¹Co and ⁸⁶Sr(p,α)⁸³Rb reactions from threshold up to 18.5 MeV. Thin samples of 95% enriched ⁶⁴Ni were prepared by electrodeposition on gold foils, and those of 96.3% enriched ⁸⁶SrCO₃ via sedimentation on Cu backing. The radioactivity of the activation products was determined via high resolution γ-ray spectrometry. Statistical model calculations taking into account preequilibrium effects were performed for the experimentally measured competing reactions induced by protons on the target nuclei ⁶⁴Ni, ⁷⁸Kr, and ⁸⁶Sr. The strong (p,n) channel is described well by the calculation. In the case of weaker channels some discrepancies occurred between the experimental and theoretical data, in particular for ⁷⁸Kr as target. Regarding the (p,α) process, an attempt was made to include direct three-nucleon pickup component. For the neutron deficient target nuclei ⁷⁸Kr and ⁸⁶Sr the direct reaction contribution to the (p,α) cross section appears to be small, presumably due to large (p,n) thresholds. Inclusion of this component in the (p,α) reaction on the neutron rich target nuclide ⁶⁴Ni, however, led to a better agreement between the experimental and theoretical data