A study of K+d interactions from 865 to 1585 MeV/c

Abstract

K d part1al cross sections and calculate most of the others using relations derived from isospin conservation and data from other experiments.The most striking feature of the cross section data is the abrupt rise of the total single-pion-production cross section near 1000 MBV/c.We extract isospin-O KN partial cross sections and find a rapid increase of cro(KNrr) at the threshold for the quasi-two-body reactionAs in the case of the isospin-l K+N system,it appears that the structure around 1200 MeV/c in the I total cross section for the isospin-O K+N system is well reconstructed by the sum of three smoothly varying channel cross sectionscr (KN), cr (KNrc), and cr (KNrcrc). We study the reaction KN ~ K*N 0 0 0 near threshold and find that the production and decay angular distributions can be interpreted in terms of t-channel phenomena, specifically a superposition of ru, p, and rc exchange. As is true of the lsospin-l K6 and K*N * final states, the lsospln-O K N state has a behavior near threshold which is not very different from its behavior at much higher energy.

Evolution of N = 28 shell closure in relativistic continuum Hartree-Bogoliubov theory

“…Theoretically, a lot of approaches have been employed to describe properties of neutron-rich N ≃ 28 nuclei within the framework of shell model [43][44][45][46][47][48][49][50] and selfconsistent mean field theory [51][52][53][54][55][56][57][58][59][60][61]. In relativistic mean field (RMF) approach, the axial RMF theory suggested N = 28 shell closure is broken in 42 Si and 44 S [51].…”

“…In relativistic mean field (RMF) approach, the axial RMF theory suggested N = 28 shell closure is broken in 42 Si and 44 S [51]. The triaxial RMF theory predicted a shape evolution from prolate shapes for 42−44 S to triaxial shapes for 48−52 S, then an oblate shape for 54 S and to a spherical shape for 56 S [52]. Taking the pairing correlation into account, relativistic Hartree-Bogoliubov (RHB) theory based on harmonic oscillator basis predicted a strong suppression of the N = 28 shell gap for neutron-rich magnesium, silicon and sulfur isotopes [53].…”