RESUMO
The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
RESUMO
Predictions are obtained for T=0 and T=1 deuteron-transfer intensities between self-conjugate N=Z nuclei on the basis of a simplified interacting boson model which considers bosons without orbital angular momentum but with full spin-isospin structure. These transfer predictions can be correlated with nuclear binding energies in specific regions of the mass table.
RESUMO
The ground state band in (46)Cr and the isospin T = 1 band in (46)V have been delineated up to Ipi = 10(+) (tentatively 12(+)). These observations complete the highest spin T = 1 isospin triplet known. Following the isobaric multiplet mass equation, a combination of level energies in (46)Cr, (46)Ti, and (46)V are taken to highlight the angular momentum dependence of the isovector and isotensor parts of the interaction. The results are compared with full- fp-space shell model calculations. The influence of the one-body and two-body contributions to the isovector energy difference are investigated.
RESUMO
Some examples of new phenomena expected at extreme values of neutron and proton number are discussed, including soft dipole modes and neutron-proton pairing. First results on the N = Z nucleus (62)Ga are presented in the context of the competition between T = 0 and 1 states in odd-odd, self-conjugate nuclei.
RESUMO
The BIOBELL simulation system is designed to simulate biochemical kinetics and nuclear magnetic resonance phenomena. The system uses portable software from the PORT Library and GASP system. The user language is illustrated. The implementation of the portable compiler - compiler and portable stiff ordinary differential equation solver are discussed. Guidelines for similar projects are given.