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.
| Original language | English |
|---|---|
| Article number | 136710 |
| Journal | Physics Letters B |
| Volume | 822 |
| DOIs | |
| State | Published - Nov 10 2021 |
Funding
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. 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, Innovaci?n 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.