Structure of 55Ti from relativistic one-neutron knockout

TL;DR

This study investigates the structure of 55Ti through relativistic one-neutron knockout reactions, providing new experimental data that confirms shell-model predictions about its ground state and orbital configurations.

Contribution

First-time observation of specific states in 55Ti and experimental validation of shell-model predictions regarding its ground state and N=34 gap.

Findings

Observation of the 955 keV nu p3/2-hole state in 55Ti

Confirmation that the ground state of 55Ti is 1/2-

Experimental data supports shell-model calculations with GXPF1A

Abstract

Results are presented from a one-neutron knockout reaction at relativistic energies on 56Ti using the GSI FRS as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive and exclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the orbital angular momentum of the populated states. First-time observation of the 955(6) keV nu p3/2-hole state in 55Ti is reported. The measured data for the first time proves that the ground state of 55Ti is a 1/2- state, in agreement with shell-model calculations using the GXPF1A interaction that predict a sizable N=34 gap in 54Ca.