Physics Letters B (Nov 2021)
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
Affiliations
- M. Holl
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada; TRIUMF, Vancouver, BC, V6T 2A3, Canada
- R. Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada; TRIUMF, Vancouver, BC, V6T 2A3, Canada; Corresponding author.
- Z.H. Sun
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- G. Hagen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- J.A. Lay
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Apartado 1065, E-41080 Sevilla, Spain; Instituto Interuniversitario Carlos I de Física Teórica y Computacional (iC1), Apdo. 1065, E-41080 Sevilla, Spain
- A.M. Moro
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Apartado 1065, E-41080 Sevilla, Spain; Instituto Interuniversitario Carlos I de Física Teórica y Computacional (iC1), Apdo. 1065, E-41080 Sevilla, Spain
- P. Navrátil
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- T. Papenbrock
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- M. Alcorta
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- D. Connolly
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- B. Davids
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- A. Diaz Varela
- Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada
- M. Gennari
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- G. Hackman
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- J. Henderson
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- S. Ishimoto
- High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
- A.I. Kilic
- Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada
- R. Krücken
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- A. Lennarz
- TRIUMF, Vancouver, BC, V6T 2A3, Canada; McMaster University, Hamilton, ON, L8S 481, Canada
- J. Liang
- McMaster University, Hamilton, ON, L8S 481, Canada
- J. Measures
- Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
- W. Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1321, USA
- O. Paetkau
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- A. Psaltis
- McMaster University, Hamilton, ON, L8S 481, Canada
- S. Quaglioni
- Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, CA 94551, USA
- J.S. Randhawa
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada
- J. Smallcombe
- TRIUMF, Vancouver, BC, V6T 2A3, Canada
- I.J. Thompson
- Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, CA 94551, USA
- M. Vorabbi
- TRIUMF, Vancouver, BC, V6T 2A3, Canada; National Nuclear Data Center, Bldg. 817, Brookhaven National Laboratory, Upton, NY 11973-5000, USA
- M. Williams
- TRIUMF, Vancouver, BC, V6T 2A3, Canada; Department of Physics, University of York, York YO10 5DD, United Kingdom
- Journal volume & issue
-
Vol. 822
p. 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.
