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[en] Experiments aimed at laser cooling and trapping of radioactive atoms are nowadays operational at several laboratories. They open up a bridge between atomic and nuclear physics, allowing new precise spectroscopic measurements and detailed analysis of nuclear decay processes. A magneto-optical trap (MOT) for francium atoms is almost operational at the INFN Legnaro laboratories; its characterization and optimization are under way. Measurements of francium production rate as a function of target temperature, primary beam intensity and energy have been carried out. Preliminary tests with other stable alkali atoms, aimed at an improvement of the MOT collection efficiency, are reported

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[en] Experimentally measured excitation functions produced via different emission channels have been compared with theoretical predictions based on statistical model code PACE-4 and interpreted in terms of CF and/or ICF. EFs for several residues "1"8"8Au, "1"8"9Pt, "1"8"8Pt, "1"8"7Ir, "1"8"5Ir and "1"8"4Ir etc. have been measured for the system "1"8O + "1"7"5Lu using the recoil catcher activation technique at energies ranging from 4-6 MeV/nucleon. Theoretical model code PACE-4 gives only the CF cross section and does not take into account the ICF processes. This code is based on the Hauser- Feshbach theory of compound nucleus (CN) decay and uses statistical approach of CN deexcitation

[en] We have measured small angle correlations between light particles (p,d,t,α) at an energy of 140 for the ¹⁶O+²⁷Al and ¹⁸O+²⁷Al systems. The correlation functions were measured at a laboratory angle of 20 degrees with the Stony Brook LINAC. As for earlier work, the p-p and p-d results from both systems are well fit by a model which assumes statistical emission from an equilibrated compound nucleus. The d-α and α-α results from the two systems can be reproduced if a small amount of decaying excited ⁶Li or ⁸Be are included in the simulation. Finally, the relative two particle yields and deduced ⁸Be yield, which are very different for the two systems, will be compared to predictions based on statistical emission

[en] We measured the static electric quadrupole moment (Q₂+) and B(E2,0₁⁺→2₁⁺) of the first excited state of ¹⁸O at 1.98 MeV. The values obtained were (-0.19+-0.02 b)e (for the positive sign of the interference term involving the 2₂⁺ state) and (0.0048+-0.0002 b²)e² for Q₂+ and B(E2,0₁⁺→2₁⁺), respectively. For these values the ratio (absolute value of Q₂⁺)/[B(E2,0₁⁺→2₁⁺)]¹/² is about 3, whereas for no other nucleus does it exceed unity by more than 30%

[en] Double Gamow-Teller excitations are searched for, using the ²⁴Mg(¹⁸O,¹⁸Ne)²⁴Ne reaction at 100 and 76 MeV/nucleon. The present results provide evidence for a strong suppression of double Gamow-Teller excitations. (K.A.)

[en] A ¹⁸O⁸⁺ beam of 104.0 MeV provided by HI-13 tandem accelerator at CIAE was used to bombard enriched (97.7%) ¹⁷⁰Er target of thickness 245 μg/cm² on carbon backing of 80 μg/cm. The reaction products were detected by the G120L Q3D magnetic spectrometer followed by a focal plane gas filled detector, which consists of a ΔE-E ionization chamber and two position sensitive counters. The Q-value of ¹⁷⁰Er(¹⁸O, ²⁰Ne) the author obtained was (4.70 +- 0.14) MeV. The unknown mass excess of ¹⁶⁸Dy was deduced to be (-58.56 +- 0.14) MeV by means of the known masses of ¹⁷⁰Er, ¹⁸O, ²⁰Ne and the reaction Q-value. This is the first experimental value

[en] The interference effects for the 110 and 197 keV γ-ray lines of the nuclear reactions ¹⁹F(p,p^'γ )¹⁹F and ¹⁸O(p,γ)¹⁹F were studied quantitatively. For this, thick liquid targets were examined by proton induced gamma-ray emission (PIGE) using an external proton beam of 3.4 MeV energy. Several grades of dilutions were prepared from 76.3% ¹⁸O enriched H₂O and from 1000 ppm F standard NaF solution. From this, a data base was obtained in order to extrapolate the 110 and 197 keV γ-ray yields of the ¹⁸O(p,γ)¹⁹F reaction for a target of water containing 0.2% ¹⁸O. As a result it was obtained that, for fluorine in oxygen-rich materials, the reaction ¹⁹F(p,p^'γ)¹⁹F allows minimum detection limits of (1.06±0.12) and (1.85±0.2) at.ppm for the 110 and 197 keV γ-rays, respectively