A New Measurement of the Intruder Configuration in 12Be

Abstract

A new ${}^{11}$Be($d,p$)${}^{12}$Be transfer reaction experiment was carried out in inverse kinematics at 26.9$A$ MeV, with special efforts devoted to the determination of the deuteron target thickness and of the required optical potentials from the present elastic scattering data. In addition, a direct measurement of the cross sections for the 0${}_2^{+}$ state was realized by applying an isomer-tagging technique. The s-wave spectroscopic factors of 0.20(0.04) and 0.41(0.11) were extracted for the 0${}_1^{+}$ and 0${}_2^{+}$ states, respectively, in ${}^{12}$Be. Using the ratio of these spectroscopic factors, together with the previously reported results for the p-wave components, the single-particle component intensities in the bound 0${}^{+}$ states of ${}^{12}$Be were deduced, allowing a direct comparison with the theoretical predictions. It is evidenced that the ground-state configuration of ${}^{12}$Be is dominated by the d-wave intruder, exhibiting a dramatic evolution of the intruding mechanism from ${}^{11}$Be to ${}^{12}$Be, with a persistence of the $N=8$ magic number broken.

References in corpus (10)

• Shell-model study of boron, carbon, nitrogen and oxygen isotopes based on monopole-based-universal interaction
• Structure of 12Be: intruder d-wave strength at N=8
• Single-neutron transfer from 11Be gs via the (p,d) reaction with a radioactive beam
• Halo nucleus Be-11: A spectroscopic study via neutron transfer
• Survey of excited state neutron spectroscopic factors for Z=8-28 nuclei
• Three-body structure of low-lying 12Be states
• Particle-particle random phase approximation applied to Beryllium isotopes
• Study of bound states in 12Be through low-energy 11Be(d,p)-transfer reactions
• The impact of the off-diagonal cross-shell interaction on ${}^{14}$C
• The dominance of the $\nu (0d_{5/2}{)}^2$ configuration in the $N=8$ shell in ${}^{12}$Be from the breakup reaction on a proton target at intermediate energy

Cited by in corpus (8)

• Experimental study of intruder components in light neutron-rich nuclei via single-nucleon transfer reaction
• Ab initio study of the beryllium isotopes ${}^7$Be to ${}^{12}$Be
• Observation of the near-threshold intruder $0^{-}$ resonance in ${}^{12}$Be
• Recent progress in configuration-interaction shell model
• STRASSE: A Silicon Tracker for Quasi-free Scattering Measurements at the RIBF
• Spectroscopic factor calculations in the \textit{ab initio} no-core shell model
• Structure Studies of ${}^{13}\text{Be}$ from the ${}^{12}$Be(d,p) reaction in inverse kinematics on a solid deuteron target
• Property investigation for different wedge-shaped CsI(Tl)s