Penning trap mass measurements on (99-109)$Cd with ISOLTRAP and implications on the rp process

Penning trap mass measurements on neutron-deficient Cd isotopes (99-109)Cd have been performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN, all with relative mass uncertainties below 3*10^8. A new mass evaluation has been performed. The mass of 99Cd has been determined for the first time which extends the region of accurately known mass values towards the doubly magic nucleus 100Sn. The implication of the results on the reaction path of the rp process in stellar X-ray bursts is discussed. In particular, the uncertainty of the abundance and the overproduction created by the rp-process for the mass A = 99 is demonstrated by reducing the uncertainty of the proton-separation energy of 100In Sp(100In) by a factor of 2.5.Comment: 14 pages, 9 figure

Comparison of low--energy resonances in 15N(alpha,gamma)19F and 15O(alpha,gamma)19Ne and related uncertainties

A disagreement between two determinations of Gamma_alpha of the astro- physically relevant level at E_x=4.378 MeV in 19F has been stated in two recent papers by Wilmes et al. and de Oliveira et al. In this work the uncertainties of both papers are discussed in detail, and we adopt the value Gamma_alpha=(1.5^{+1.5}_{-0.8})10^-9eV for the 4.378 MeV state. In addition, the validity and the uncertainties of the usual approximations for mirror nuclei Gamma_gamma(19F) approx Gamma_gamma(19Ne), theta^2_alpha(19F) approx theta^2_alpha(19Ne) are discussed, together with the resulting uncertainties on the resonance strengths in 19Ne and on the 15O(alpha,gamma)19Ne rate.Comment: 9 pages, Latex, To appear in Phys. Rev.

Désexcitation γ de niveaux du 41Ca

The y branching ratios have been measured for 41Ca levels at 3.200-3.369-3.400-3.495-3.527-3.614-3.676-3.730-3.845-3.945 and 3.976 MeV, by coincidence between protons and γ of the 40Ca(d, pγ) 41Ca reaction. Analysis of these data permits tentative assignements for spins and parities : 9/2 ± (3.2 MeV), 11/2 + (3.369 MeV), 3/2 + (3.495 MeV), 1/2 ± or 3/2 + (3.527 MeV), 3/2 — (3.614 MeV), I ≽ 5/2 (3.676 MeV), 5/2 + (3.73 MeV), 3/2 — or 5/2 ± (3.976 MeV). The method is discussed and compared to more sophisticated calculations.Le schéma de désexcitation γ des niveaux à 3,200-3,369-3,400-3,495-3,527-3,614-3,676-3,730-3,845-3,945 et 3,976 MeV du 41Ca a été étudié par coïncidence entre les protons et les γ de la réaction 40Ca(d, pγ) 41Ca. L'analyse des rapports d'embranchement mesurés permet de proposer des spins et parités pour certains niveaux : 9/2 ± (3,2 MeV), 11/2 + (3,369 MeV), 3/2 + (3,495 MeV), 1/2 ± ou 3/2 + (3,527 MeV), 3/2 — (3,614 MeV), I ≽ 5/2 (3,676 MeV), 5/2 + (3,73 MeV), 3/2 — ou 5/2 ± (3,976 MeV). La méthode d'analyse utilisée est discutée et comparée à des calculs plus élaborés