Physics Letters B (Jul 2018)
Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg
- J. Henderson,
- G. Hackman,
- P. Ruotsalainen,
- S.R. Stroberg,
- K.D. Launey,
- J.D. Holt,
- F.A. Ali,
- N. Bernier,
- M.A. Bentley,
- M. Bowry,
- R. Caballero-Folch,
- L.J. Evitts,
- R. Frederick,
- A.B. Garnsworthy,
- P.E. Garrett,
- B. Jigmeddorj,
- A.I. Kilic,
- J. Lassen,
- J. Measures,
- D. Muecher,
- B. Olaizola,
- E. O'Sullivan,
- O. Paetkau,
- J. Park,
- J. Smallcombe,
- C.E. Svensson,
- R. Wadsworth,
- C.Y. Wu
Affiliations
- J. Henderson
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Lawrence Livermore National Laboratory, Livermore, CA 94550, USA; Corresponding author.
- G. Hackman
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- P. Ruotsalainen
- Department of Physics, University of Jyväskylä, FIN-40014 Finland
- S.R. Stroberg
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- K.D. Launey
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge 70803, USA
- J.D. Holt
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- F.A. Ali
- Department of Physics, College of Education, University of Sulaimani, P.O. Box 334, Sulaimani Kurdistan Region, Iraq; Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- N. Bernier
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver V6T 1Z1, Canada
- M.A. Bentley
- Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
- M. Bowry
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- R. Caballero-Folch
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- L.J. Evitts
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- R. Frederick
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- A.B. Garnsworthy
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- P.E. Garrett
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- B. Jigmeddorj
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- A.I. Kilic
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- J. Lassen
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- J. Measures
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
- D. Muecher
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- B. Olaizola
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- E. O'Sullivan
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- O. Paetkau
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- J. Park
- TRIUMF, Vancouver, BC V6T 2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver V6T 1Z1, Canada
- J. Smallcombe
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- C.E. Svensson
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
- R. Wadsworth
- Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
- C.Y. Wu
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- Journal volume & issue
-
Vol. 782
pp. 468 – 473
Abstract
Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be studied within a microscopic or ab initio framework without the use of effective charges; for example with the proper evolution of the E2 operator, or alternatively, through the use of an appropriate and manageable subset of particle–hole excitations. We present a precise determination of E2 strength in 22Mg and its mirror 22Ne by Coulomb excitation, allowing for rigorous comparisons with theory. No-core symplectic shell-model calculations were performed and agree with the new B(E2) values while in-medium similarity-renormalization-group calculations consistently underpredict the absolute strength, with the missing strength found to have both isoscalar and isovector components. The discrepancy between two microscopic models demonstrates the sensitivity of E2 strength to the choice of many-body approximation employed. Keywords: 22Mg, 22Ne, Ab initio, Collectivity, Coulomb excitation
