Investigating the 10Li continuum through 9Li(d,p)10Li reactions

A.M Moro,J Casal,M Gómez-Ramos

doi:10.1016/j.physletb.2019.04.015

A.M Moro, J Casal + Show 1 more

Open Access

https://doi.org/10.1016/j.physletb.2019.04.015

Copy DOI

Abstract

The continuum structure of the unbound system 10Li, inferred from the 9Li(d,p)10Li transfer reaction, is reexamined. Experimental data for this reaction, measured at two different energies, are analyzed with the same reaction framework and structure models. It is shown that the seemingly different features observed in the measured excitation energy spectra can be understood as due to the different incident energy and angular range covered by the two experiments. The present results support the persistence of the N=7 parity inversion beyond the neutron dripline as well as the splitting of the well-known low-lying p-wave resonance. Furthermore, they provide indirect evidence that most of the ℓ=2 single-particle strength, including possible d5/2 resonances, lies at relatively high excitations energies.

Highlights

Understanding the nuclear shell evolution as a function of the proton-neutron asymmetry is one of the major goals in nowadays nuclear physics
We reexamine the problem of the 10Li continuum, by presenting a joint and consistent analysis of the 9Li(d, p)10Li reactions measured at REX-ISOLDE [11] and TRIUMF [20], using in both cases the same reaction framework and structure models
From the upper panel of this figure, it becomes apparent that, for the angular range spanned by the REX-ISOLDE experiment, [11] the s- and p-wave contributions are of similar magnitude, and both contributions are visible in the excitation energy spectrum

Summary

Introduction

Understanding the nuclear shell evolution as a function of the proton-neutron asymmetry is one of the major goals in nowadays nuclear physics. Several experiments [4,11,31] suggest that its ground state consists of an = 0 virtual state, followed by a narrow p-wave resonance, whose energy sequence would point toward a persistence of the parity inversion observed in 11Be. an accurate knowledge of the 10Li system is crucial for a proper understanding of the 11Li nucleus, the archetypal three-body Borromean nucleus. We reexamine the problem of the 10Li continuum, by presenting a joint and consistent analysis of the 9Li(d, p)10Li reactions measured at REX-ISOLDE [11] and TRIUMF [20], using in both cases the same reaction framework and structure models.

Reaction framework

Numerical results

Evidence for d-wave resonances

Summary and conclusions