[en] For decades the reaction ⁷Be(p,γ)⁸B has been one of the major sources of uncertainties in estimating the ⁸B solar neutrino flux and has played a critical role in revealing the so-called 'Solar Neutrino Problem'. A summary of the current status of this reaction is given

[en] The ⁷Be(p, γ)⁸B reaction has been studied at GSI via the Coulomb Dissociation of ⁸B at 254 A MeV, using the large acceptance spectrometer KAOS to detect the outgoing fragments. We have studied experimentally the E2 contribution to the Coulomb Dissociation by measuring the angular correlations of the breakup fragments. The resulting astrophysical S₁₇ factor is compared to the results of other direct and indirect measurements

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[en] Until now, the Sharp-Bardeen–Cooper–Schrieffer (SBCS) particle-number projection method, in the isovector neutron–proton pairing case, has been developed in the particle representation. However, this formalism is sometimes complicated and cumbersome. In this work, the formalism is developed in the quasiparticle representation. An expression of the projected ground state wave function is proposed. Expressions of the energy as well as the expectation values of the total particle-number operator and its square are deduced. It is shown that these expressions are formally similar to their homologues in the pairing between like-particles case. They are easier to handle than the ones obtained using the particle representation and are more adapted to numerical calculations. The method is then numerically tested within the schematic one-level model, which allows comparisons with exact results, as well as in the case of even–even nuclei within the Woods–Saxon model. In each case, it is shown that the particle-number fluctuations that are inherent to the BCS method are completely eliminated by the projection. In the framework of the one-level model, the values of the projected energy are clearly closer to the exact values than the BCS ones. In realistic cases, the relative discrepancies between projected and unprojected values of the energy are small. However, the absolute deviations may reach several MeV. (author)

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[en] The ⁷Be(p,γ)⁸B cross section has been re-measured using radioactive targets. The zero-energy astrophysical S-factor is found significantly lower than the previously adopted value. (author)

[en] The one-proton and two-proton separation energies are studied for "ordinary" and rare-earth proton-rich nuclei by including the isovector neutron–proton (np) pairing correlations using the BCS approximation. Even–even as well as odd nuclei are considered. In the latter case, the wave function is defined using the blocked-level technique. The single-particle energies used are those of a deformed Woods–Saxon mean field. It is shown that the np isovector pairing effects on the one-proton and two-proton separation energies are non-negligible. However, the only isovector BCS approximation seems to be inadequate for a good description of these quantities when including the np pairing effects: either a particle-number projection or the inclusion of the isoscalar pairing effect seems to be necessary. Another possible improvement would be a more realistic choice of the pairing strengths. (author)

[en] The abundance of ¹⁸F in Nova explosions is an important issue for the understanding of this astrophysical phenomenon. For this reason it is necessary to study the nuclear reactions that produce or destroy this isotope in novae. Among these latter processes, the ¹⁸F(p,α)¹⁵O is one of the main ¹⁸F destruction channels. We report here on the preliminary results of the first experiment that applies the Trojan Horse Method to a Radioactive Ion Beam induced reaction. The experiment was performed using the CRIB apparatus of the Center for Nuclear Study of The Tokyo University.

[en] New levels were attributed to ⁸¹₃₁Ga₅₀ and ⁸³₃₂Ge₅₁ which were fed by the β-decay of their respective mother nuclei ⁸¹₃₀Zn₅₁ and ⁸³₃₁Ga₅₂ produced by fission at the 'PARRNe' ISOL set-up installed at the Tandem accelerator of the Institut de Physique NucleLeaire, Orsay. We show that the low energy structure of ⁸¹₃₁Ga₅₀ and ⁸³₃₂Ge₅₁ can easily be explained within the natural hypothesis of a strong energy gap at N = 50 and a doubly-magic character for ⁷⁸Ni