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Structure of unbound neutron-rich 9He studied using single-neutron transfer

T. Al Kalanee et al.
Phys. Rev. C 88, 034301 – Published 3 September 2013
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  • INTRODUCTION
  • EXPERIMENT
  • ANALYSIS
  • RESULTS
  • DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    The 8He(d,p) reaction was studied in inverse kinematics at 15.4A MeV using the MUST2 Si-CsI array in order to shed light on the level structure of 9He. The well known 16O(d,p)17O reaction, performed here in reverse kinematics, was used as a test to validate the experimental methods. The 9He missing mass spectrum was deduced from the kinetic energies and emission angles of the recoiling protons. Several structures were observed above the neutron-emission threshold and the angular distributions were used to deduce the multipolarity of the transitions. This work confirms that the ground state of 9He is located very close to the neutron threshold of 8He and supports the occurrence of parity inversion in 9He.

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    • Received 29 April 2013

    DOI:https://doi.org/10.1103/PhysRevC.88.034301

    ©2013 American Physical Society

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    Issue

    Vol. 88, Iss. 3 — September 2013

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    Images

    • Figure 1
      Figure 1
      Schematic diagram of the experimental setup. Trapezium shapes represent MUST2 modules.Reuse & Permissions
    • Figure 2
      Figure 2
      Experimental missing mass spectrum for the 16O(d,p)17O reaction in inverse kinematics. Dashed line (brown): three-body phase space. Thin solid line (green): background from reactions of the beam with the carbon of the CD2 target. Inset: sample angular distribution for the first excited state, compared to a DWBA calculation.Reuse & Permissions
    • Figure 3
      Figure 3
      Experimental missing mass spectrum for the (p,8He)p reaction which is described with three states: ground state (red), first excited (green), and second excited (blue) states. The solid gray line models the acceptance cutoff. The solid black line denotes the sum of the three-, five-, and seven-body phase space contributions, whose respective breakup energies are noted. The dotted line indicates the physical background due to reactions of the beam with the plastic scintillator. The thin solid line is the sum of all contributions. The region around the threshold is shown in the inset.Reuse & Permissions
    • Figure 4
      Figure 4
      Angular distributions for the ground state (a) and the two first excited states of 9He [(c) and (d)] compared to L=0,1,2 (respectively red, green, and blue) DWBA calculations. (b) Angular distribution of the g.s. compared to CCBA calculations.Reuse & Permissions
    • Figure 5
      Figure 5
      Summary of all experimental results for 9He, up to 5 MeV excitation energy. Solid lines represent states with well defined resonance. Dashed lines or hashed areas represent low-lying structures described by virtual s-wave states (see text for details).Reuse & Permissions
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