Search for the 1/2_2 intruder bandhead in 35P

ORAL

Abstract

Particle-hole sd-pf cross-shell intruder configurations have been observed in the low-lying level scheme of N = 20 even-even nuclei near the Island of Inversion centered around 32Mg. However, the expected 1/2_2 intruder bandhead has not yet been identified in the odd-even nucleus 35P. Previous attempts to identify this state suffered from a large background in the region of interest arising from contaminants in the target.

We will report on a recent measurement using the 36S(d, 3He)35P reaction in inverse kinematics with the Helical Orbit Spectrometer (HELIOS) at ATLAS (ANL). Thanks to the unique capabilities of HELIOS, enhanced with a recoil detector setup, it is possible to perform the reaction in nearly background free conditions.

An analysis of the reconstructed 3He spectrum in HELIOS did not show a peak that could be associated with the 1/2_2 intruder state in the region of interest with an intensity greater than 5% of the ground-state. This result provides an additional constraint to state-of-the-art theoretical descriptions to further understand the evolution of shell structure in the region.

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Presenters

  • Marco Salathe

    Nuclear Science Division, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab

Authors

  • Marco Salathe

    Nuclear Science Division, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab

  • Heather Crawford

    Nuclear Science Division, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab, Lawrence Berkeley Natl Lab, Argonne Natl Lab, Los Alamos Natl Lab, University of Connecticut, iThemba LABS, University of Maryland, Lawrence Berkeley National Laboratory