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Neutron knockout from 68,70Ni ground and isomeric states

Recchia, F., Weisshaar, D., Gade, A., Tostevin, Jeffrey, Janssens, R. V. F., Albers, M., Bader, V. M., Baugher, T., Bazin, D., Berryman, J. S. , Brown, B. A., Campbell, C. M., Carpenter, M. P., Chen, J., Chiara, C. J., Crawford, H. L., Hoffman, C. R., Kondev, F. G., Korichi, A., Langer, C., Lauritsen, T., Liddick, S. N., Lunderberg, E., Macchiavelli, A. O., Noji, S., Stroberg, S. R., Suchyta, S., Williams, S., Wimmer, K. and Zhu, S. (2018) Neutron knockout from 68,70Ni ground and isomeric states In: 12th International Spring Seminar on Nuclear Physics, 15-19 May 2017, Ischia, Italy.

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Abstract

Neutron-rich isotopes are an important source of new information on nuclear physics. Specifically, the spin-isospin components in the nucleon-nucleon (NN) interaction, e.g., the proton-neutron tensor force, are expected to modify shell structure in exotic nuclei. These potential changes in the intrinsic shell structure are of fundamental interest. The study of the excitation energy of states corresponding to specific configurations in even-even isotopes, together with the single-particle character of the first excited states of odd-A, neutron-rich Ni isotopes, probes the evolution of the neutron orbitals around the Fermi surface as a function of the neutron number a step forward in the understanding of the region and the nature of the NN interaction at large N/Z ratios. In an experiment carried out at the National Superconducting Cyclotron Laboratory, new spectroscopic information was obtained for 68Ni and the distribution of single-particle strengths in 67 , 69Ni was characterized by means of single-neutron knockout from 68 , 70Ni secondary beams. The spectroscopic strengths, deduced from the measured partial cross sections to the individual states tagged by their de-exciting gamma rays, is used to identify and quantify configurations that involve neutron excitations across the N = 40 harmonic oscillator shell closure. The de- excitation rays were measured with the GRETINA tracking array. The results challenge the validity of the most current shell-model Hamiltonians and effective interactions, highlighting shortcomings that cannot yet be explained. These results suggest that our understanding of the low-energy states in such nuclei is not complete and requires further investigation.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Recchia, F.UNSPECIFIEDUNSPECIFIED
Weisshaar, D.UNSPECIFIEDUNSPECIFIED
Gade, A.UNSPECIFIEDUNSPECIFIED
Tostevin, JeffreyJ.Tostevin@surrey.ac.ukUNSPECIFIED
Janssens, R. V. F.UNSPECIFIEDUNSPECIFIED
Albers, M.UNSPECIFIEDUNSPECIFIED
Bader, V. M.UNSPECIFIEDUNSPECIFIED
Baugher, T.UNSPECIFIEDUNSPECIFIED
Bazin, D.UNSPECIFIEDUNSPECIFIED
Berryman, J. S.UNSPECIFIEDUNSPECIFIED
Brown, B. A.UNSPECIFIEDUNSPECIFIED
Campbell, C. M.UNSPECIFIEDUNSPECIFIED
Carpenter, M. P.UNSPECIFIEDUNSPECIFIED
Chen, J.UNSPECIFIEDUNSPECIFIED
Chiara, C. J.UNSPECIFIEDUNSPECIFIED
Crawford, H. L.UNSPECIFIEDUNSPECIFIED
Hoffman, C. R.UNSPECIFIEDUNSPECIFIED
Kondev, F. G.UNSPECIFIEDUNSPECIFIED
Korichi, A.UNSPECIFIEDUNSPECIFIED
Langer, C.UNSPECIFIEDUNSPECIFIED
Lauritsen, T.UNSPECIFIEDUNSPECIFIED
Liddick, S. N.UNSPECIFIEDUNSPECIFIED
Lunderberg, E.UNSPECIFIEDUNSPECIFIED
Macchiavelli, A. O.UNSPECIFIEDUNSPECIFIED
Noji, S.UNSPECIFIEDUNSPECIFIED
Stroberg, S. R.UNSPECIFIEDUNSPECIFIED
Suchyta, S.UNSPECIFIEDUNSPECIFIED
Williams, S.UNSPECIFIEDUNSPECIFIED
Wimmer, K.UNSPECIFIEDUNSPECIFIED
Zhu, S.UNSPECIFIEDUNSPECIFIED
Date : 2018
Funders : Science and Technology Facilities Council (STFC)
Copyright Disclaimer : © Copyright 2018 IOP Publishing
Related URLs :
Depositing User : Clive Harris
Date Deposited : 22 Jan 2018 10:04
Last Modified : 22 Jan 2018 10:04
URI: http://epubs.surrey.ac.uk/id/eprint/845651

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