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We investigate isospin breaking in low-energy pion-nucleon scattering in the framework of chiral perturbation theory. This work extends the systematic analysis of Fettes et al. Phys. Lett. B 451 , 233 (1999) to the energy range above threshold. Various relations, which identically vanish in the...
We consider the interaction of two Skyrmions in the framework of the sudden approximation. The widely used product Ansatz is investigated. Its failure in reproducing an attractive central potential is associated with terms that violate G parity. We discuss the construction of alternative Ansätze...
The ground state half-lives of the gold isotope 196 Au , the mercury isotopes 1 9 5 , 1 9 7 , 2 0 3 Hg , the lead isotope 203 Pb , and the half-lives of two isomers in 199 Hg and 204 Pb have been measured with high precision using the photoactivation technique. The γ -ray activity was counted...
We study the properties of the 1 S 0 pairing gap in low-density neutron matter. Different corrections to the lowest-order scattering length approximation are explored, resulting in a strong suppression with respect to the BCS result.
The problem of the motion of the center of mass in nuclear many-body systems is revisited. In the first part of the work, the counterterms needed to fulfill the translational and Galilean invariances are solved through the exact albeit perturbative expansion underlying the random-phase...
We suggest that the ultrarelativistic collisions of heavy ions provide the simplest situation for the study of strong interactions which can be understood from first principles and without any model assumptions about the microscopic structure of the colliding nuclei. We argue that the...
An upper limit of 5 keV on the width of the 12 O ground state due to 2 He emission is calculated using R -matrix formulas. This limit is much less than a recently published estimate.
The 3 4 , 3 5 Al β decays have been studied at the CERN online mass separator ISOLDE by β-γ, β-γ-γ, and β - n - γ measurements in order to corroborate the low-level description of 34 Si and to obtain the first information on the level structure of the N = 21 isotope 35 Si . Earlier...
We propose a collective Hamiltonian which incorporates quadrupole terms, octupole terms classified according to the irreducible representations of the octahedron group, a quadrupole-octupole interaction, as well as a term for the bandhead energy linear in K (the projection of angular momentum on...
In the framework of the Glauber approximation, using a simple suggested approach for the three-body force effect and taking into account D - s t a t e and phase variation effects, p - , p ¯ - , and π - - d elastic scattering differential cross sections at different energies are calculated. In...
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