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. et al, 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 :	Name Email ORCID Recchia, F. Weisshaar, D. Gade, A. Tostevin, Jeffrey J.Tostevin@surrey.ac.uk 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. Zhu, S.
Date :	2018
Funders :	Science and Technology Facilities Council (STFC)
DOI :	10.1088/1742-6596/966/1/012048
Copyright Disclaimer :	© Copyright 2018 IOP Publishing. 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.
Related URLs :	Publisher
Depositing User :	Clive Harris
Date Deposited :	22 Jan 2018 10:04
Last Modified :	11 Dec 2018 11:23
URI:	http://epubs.surrey.ac.uk/id/eprint/845651

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