Axionlike particles (ALPs) coupled to nucleons might be copiously emitted from a supernova (SN) core. We extend existing bounds on free-streaming ALPs the case in which these are so strongly interacting with nuclear matter trapped SN For ALPs, we also bound absence of an ALP-induced signal Kamiokande-II neutrino detector at time 1987A. find that combining different arguments, SNe exclude values ALP-nucleon coupling <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...

Axions coupled to nucleons might be copiously emitted from core-collapse supernovae (SNe). If the axion-nucleon coupling is strong enough, then axions would SN as a burst and, reaching Earth, may excite oxygen nuclei in water \ifmmode \check{C}\else \v{C}\fi{}herenkov detectors ($^{16}\mathrm{O}+a\ensuremath{\rightarrow}^{16}\mathrm{O}^{*}$). This process will followed by decay(s) of excited state resulting an emission photons and thus providing possibility for direct detection galactic...

We discuss the need of including tensor terms in effective Gogny interaction used mean-field calculations. show one illustrative case that, with usual term that is employed Skyrme (and allows us to separate like-nucleon and neutron-proton contributions), we can describe evolution N=28 neutron gap calcium isotopes. propose include a tensor-isospin finite-range interactions type. The parameters two allow treat separately contributions. Two parameterizations have been chosen reproduce different...

We present a study of the effects tensor-isospin term effective interaction in Hartree-Fock and Random Phase Approximation calculations. used finite-range forces Gogny type, we added to them which behaves, at large internucleonic distances, as analogous microscopic interactions. The strength this tensor force has been chosen reproduce experimental energy lowest 0$^-$ excited state $^{16}$O, shows sensitivity interaction. With these interactions, have studied ground states carbon, oxygen,...

Random Phase Approximation (RPA) is the theory most commonly used to describe excitations of many-body systems. In this article, secular equations are obtained by using three different approaches: equation motion method, Green function perturbation and time-dependent Hartree–Fock theory. Each approach emphasizes specific aspects overlooked other methods. Extensions RPA treat continuum part excitation spectrum also pairing between particles composing system presented. Theoretical approaches...

We present the first applications of second random-phase-approximation model with finite-range Gogny interaction. discuss advantages using such an interaction in this type calculations where two-particle--two-hole configurations are included. The results found work confirm well-known general features random-phase approximation spectra: find a large shift, several MeV, response centroids to lower energies respect corresponding values. As known, these indicate that effects...

We study the ground state properties of doubly closed shell nuclei $^{16}$O and $^{40}$Ca in framework Correlated Basis Function theory using dependent correlations, with central tensor components. The realistic Argonne $v_{14}$ $v'_{8}$ two-nucleon potentials three-nucleon Urbana class have been adopted. By means Fermi Hypernetted Chain integral equations, conjunction Single Operator approximation, we evaluate energy, one- two-body densities electromagnetic spin static responses for both...

We present a technique that treats, without approximations, the continuum part of excitation spectrum in random phase approximation calculations with finite-range interactions. The interaction used Hartree-Fock to generate single-particle basis is also calculations. show results for electric dipole and quadrupole excitations $^{16}\mathrm{O}$, $^{22}\mathrm{O}$, $^{24}\mathrm{O}$, $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ca}$, $^{52}\mathrm{Ca}$ nuclei. compare our those traditional discrete...

We demonstrate that the charge-distribution differences between isotopes of heavy-mass nuclei are most sensitive experimental quantities for extraction compression modulus nuclear matter. This analysis shows a larger than 200 MeV.

The electric dipole excitation of various nuclei is calculated with a Random Phase Approximation phenomenological approach. evolution the strength distribution in groups isotopes oxygen, calcium, zirconium, and tin studied. neutron excess produces $E1$ low-energy region. Indexes to measure collectivity are defined. We studied behavior proton transition densities determine isoscalar or isovector nature excitation. observed that medium-heavy has characteristics rather different than those...

A bstract In processes taking place at energies much higher than the weak scale, electroweak corrections can be taken into account by using evolution equations, that are analogous to DGLAP equations in QCD. We show isospin conservation these imposes modify expressions of splitting functions commonly used literature. These modifications have a profound impact on parton distribution functions.

We study the evolution of $(e,{e}^{\phantom{\rule{0.16em}{0ex}}\ensuremath{'}}p)$ cross section on nuclei with increasing asymmetry between number neutrons and protons. The calculations are done within framework distorted-wave impulse approximation, by adopting nonrelativistic relativistic models. compare results obtained three different approaches based mean-field description for proton bound-state wave function. In model phenomenological Woods-Saxon Hartree-Fock functions used; in...

The ground state properties of $N=Z$ doubly closed shell nuclei are studied within correlated basis function theory. A truncated version the Urbana ${v}_{14}$ realistic potential, with spin, isospin, and tensor components, is adopted, together state-dependent correlations. Fermi hypernetted chain integral equations used to evaluate density, distribution function, energy ${}^{16}\mathrm{O}$ ${}^{40}\mathrm{Ca}.$ nuclear matter single operator approximation extended finite systems, deal...

The proton momentum and density distributions of closed shell nuclei are calculated with a model treating short-range correlations up to first order in the cluster expansion. validity is verified by comparing results obtained using purely scalar those produced finite Fermi hypernetted chain calculations. State dependent used calculate ${}^{12}$C, ${}^{16}$O, ${}^{40}$Ca, ${}^{48}$Ca, effects their tensor components studied.

We present a model which describes the properties of odd-even nuclei with one nucleon more, or less, respect to magic number. In addition effects related unpaired nucleon, we consider those produced by excitation closed shell core. By using single-particle basis generated Hartree-Fock calculations, describe polarization doubly magic-core random phase approximation collective wave functions. every step calculation, and for all considered, use same finite-range nucleon-nucleon interaction....