Study of bound states in¹⁰Be by one neutron removal reactions of¹¹Be

Abstract

The bound states of 10 Be have been studied by removing single neutrons from 11 Be nuclei. A 2.8 MeV u -1 beam of 11 Be was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in 10 Be were identified by Made open access 12 September 2017Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in 10 Be. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the + 2 2 state is observed, which which may indicate the presence of multi-step processes at our beam energy.

Clusters in light nuclei: history and recent developments

“…From the experimental point of view, the spectroscopic factors for five bound states in 10 Be were obtained at ISOLDE via one-neutron transfer reactions (d,t) and (p,d) in inverse kinematics with the use of a radioactive beam of 11 Be [396]. Differential cross sections were analyzed within the DWBA framework, and the obtained spectroscopic factors were compared to values already reported in the literature.…”

Analysis of spectroscopic factors in Be11 and Be12 in the Nilsson strong-coupling limit

“…The lightest example of a so-called "Island of Inversion" is that at N = 8, where the removal of p 3/2 protons from 14 C results in a quenching of the N =8 shell gap [1][2][3][4]. This is evident with the sudden drop of the E(2 + ) energy in 12 Be relative to the neighboring eveneven isotopes, and the inversion of the ground state of 11 Be from the expected 1/2 − to the observed positive parity 1/2 + state.…”

“…In this work we analyze spectroscopic factors, obtained from studies of the 11 Be(d, p) 12 Be [13,14], 10 Be(d, p) 11 Be [15,16], 12 Be one neutron knockout (−1n) [17,18] and 11 Be(p, d) 10 Be [19] reactions, in the Nilsson strong coupling limit. We use the formalism reviewed in Ref.…”