Proton inelastic scattering reveals deformation in ⁸He

M. Holl; R. Kanungo; Z.H. Sun; G. Hagen; J.A. Lay; A.M. Moro; P. Navrátil; T. Papenbrock; M. Alcorta; D. Connolly; B. Davids; A. Diaz Varela; M. Gennari; G. Hackman; J. Henderson; S. Ishimoto; A.I. Kilic; R. Krücken; A. Lennarz; J. Liang; J. Measures; W. Mittig; O. Paetkau; A. Psaltis; S. Quaglioni; J.S. Randhawa; J. Smallcombe; I.J. Thompson; M. Vorabbi; M. Williams

doi:10.1016/j.physletb.2021.136710

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Proton inelastic scattering reveals deformation in ⁸He

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Proton inelastic scattering reveals deformation in ⁸He

M. Holl, R. Kanungo, Z.H. Sun, G. Hagen, J.A. Lay, A.M. Moro, P. Navrátil, T. Papenbrock, M. Alcorta, D. Connolly, …

Physics Letters B, Vol.822, 136710

10/11/2021

DOI: https://doi.org/10.1016/j.physletb.2021.136710

Abstract

A measurement of proton inelastic scattering of 8He at 8.25A MeV at TRIUMF shows a resonance at 3.54(6) MeV with a width of 0.89(11) MeV. The energy of the state is in good agreement with coupled cluster and no-core shell model with continuum calculations, with the latter successfully describing the measured resonance width as well. Its differential cross section analyzed with phenomenological collective excitation form factor and microscopic coupled reaction channels framework consistently reveals a large deformation parameter β2 = 0.40(3), consistent with no-core shell model predictions of a large neutron deformation. This deformed double-closed shell at the neutron drip-line opens a new paradigm.

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Title: Proton inelastic scattering reveals deformation in ⁸He
Creators: M. Holl - Saint Mary's University
R. Kanungo - Saint Mary's University
Z.H. Sun - Oak Ridge National Laboratory
G. Hagen - University of Tennessee at Knoxville
J.A. Lay - Universidad de Sevilla
A.M. Moro - Universidad de Sevilla
P. Navrátil - TRIUMF
T. Papenbrock - University of Tennessee at Knoxville
M. Alcorta - TRIUMF
D. Connolly - TRIUMF
B. Davids - TRIUMF
A. Diaz Varela - University of Guelph
M. Gennari - TRIUMF
G. Hackman - TRIUMF
J. Henderson - TRIUMF
S. Ishimoto - High Energy Accelerator Research Organization
A.I. Kilic - University of Guelph
R. Krücken - TRIUMF
A. Lennarz - TRIUMF
J. Liang - McMaster University
J. Measures - McMaster University
W. Mittig - Michigan State University
O. Paetkau - High Energy Accelerator Research Organization
A. Psaltis - McMaster University
S. Quaglioni - High Energy Accelerator Research Organization
J.S. Randhawa - Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada
J. Smallcombe - McMaster University
I.J. Thompson - Lawrence Livermore National Laboratory
M. Vorabbi - High Energy Accelerator Research Organization
M. Williams - TRIUMF
Publication Details: Physics Letters B, Vol.822, 136710
Publisher: Elsevier
Date published: 10/11/2021
Date accepted: 04/10/2021
Grants: European Nuclear Science and Application Research 2, 654002, European Union (Belgium, Brussels) - EU
National Research Council Canada (Canada, Ottawa) - NRC
Grant note: The authors thank the TRIUMF ISAC beam delivery team and the cyclotron operations team. The support from NSERC, Canada Foundation for Innovation and Research Nova Scotia is gratefully acknowledged. TRIUMF receives funding via a contribution through the National Research Council Canada. The support from RCNP for the target is gratefully acknowledged. It was partly supported by the grant-in-aid program of the Japanese government under the contract number 23224008 and 14J03935. The use of the S3 detector provided by C.Y. Wu of LLNL is much appreciated. Computing support from Westgrid and Compute Canada is gratefully acknowledged. This work was supported by the Office of Nuclear Physics, US Department of Energy, under grants DE-FG02-96ER40963 and DE-SC0018223, and at Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344, as well as by the Field Work Proposal ERKBP72 at Oak Ridge National Laboratory (ORNL). Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) programme. This research used resources of the Oak Ridge Leadership Computing Facility located at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under contract no. DE-AC05-00OR22725. J.A.L. and A.M.M. are supported by the Spanish Ministerio de Ciencia, Innovación y Universidades (including FEDER funds) under project FIS2017-88410-P and by the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002. Discussions with R.B. Wiringa is gratefully acknowledged.
Identifiers: 99783829902346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Proton inelastic scattering reveals deformation in ⁸He

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