Structure of 12Be: intruder d-wave strength at N=8.

Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom.
Physical Review Letters (Impact Factor: 7.73). 02/2006; 96(3):032502. DOI: 10.1103/PhysRevLett.96.032502
Source: PubMed

ABSTRACT The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The bound states of ^{12}Be have been studied through a ^{11}Be(d,p)^{12}Be transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam of ^{11}Be was produced using the REX-ISOLDE facility at CERN. The outgoing protons were detected with the T-REX silicon detector array. The MINIBALL germanium array was used to detect gamma rays from the excited states in ^{12}Be. The gamma-ray detection enabled a clear identification of the four known bound states in ^{12}Be, and each of the states has been studied individually. Differential cross sections over a large angular range have been extracted. Spectroscopic factors for each of the states have been determined from distorted wave Born approximation (DWBA) calculations and have been compared to previous experimental and theoretical results.
    Physical Review C 10/2013; 88(4). · 3.72 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The nuclear shell structure that has served as a fundamental framework for understanding the arrangement of nucleons exhibits dramatic changes as the neutron to proton ratio in nuclei increases. This paper describes how reaction spectroscopy of the neutron- and proton-rich nuclei has brought about a new revolution towards a more global view of nuclear shells. The relationship between changes in shell structure and the discovery of exotic forms of nuclei such as nuclear halo and skin is discussed. It is shown that the well-known shell gaps (magic numbers) N = 8 and 20 disappear. The discovery of a new magic number at N = 16 at the limit of nuclear binding is discussed.
    Physica Scripta Volume T. 01/2013;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Recent developments of physics of nuclear clustering are discussed. Our discussions are mostly focussed on structural problems because the characteristic feature of the recent trends is just the remarkable developments in the various problems of structure physics. Representative subjects we discuss are (i) novel cluster structure in neutron-rich nuclei, (ii) cluster gas states, (iii) molecular states and superdeformation, (iv) coexistence mechanism of cluster and mean-field-type states, (v) cluster structure in unbound energy region, and (vi) ab initio theoretical approach to cluster structure. Various new phenomena and systems of clustering which we discuss in this paper imply the basic importance of clustering dynamics in nuclear many-body systems, which is nothing but the manifestation of the richness of nuclear many-body systems.
    Progress of Theoretical Physics Supplement 01/2012; · 1.25 Impact Factor

Full-text (2 Sources)

Available from
May 22, 2014