Low-lying states in 8B

TL;DR

This study investigates the low-lying energy states of 8B through scattering experiments and theoretical models, revealing new positive parity states and comparing findings with contemporary nuclear theories.

Contribution

The paper reports the discovery of a new 2+ state at 2.55 MeV and suggests a new 0+ state at 1.9 MeV in 8B, using R-matrix and shell model analyses.

Findings

Identification of a new 2+ state at 2.55 MeV

Tentative evidence for a 0+ state at 1.9 MeV

Comparison with theoretical models supports new state assignments

Abstract

Excitation functions of elastic and inelastic 7Be+p scattering were measured in the energy range between 1.6 and 2.8 MeV in the c.m. An R-matrix analysis of the excitation functions provides strong evidence for new positive parity states in 8B. A new 2+ state at an excitation energy of 2.55 MeV was observed and a new 0+ state at 1.9 MeV is tentatively suggested. The R-matrix and Time Dependent Continuum Shell Model were used in the analysis of the excitation functions. The new results are compared to the calculations of contemporary theoretical models.