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Neutron Knockout from Intermediate Energy Beams of 26,28 Ne

Neutron Knockout from Intermediate Energy Beams of 26,28 Ne.

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Neutron Knockout from Intermediate Energy Beams of 26,28 Ne

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  1. Neutron Knockout from Intermediate Energy Beams of 26,28Ne J.R. Terry1,2, D. Bazin1, B.A.Brown1,2, C.M. Campbell1,2, J.A. Church1,2, J.M. Cook1,2, A.D. Davies1,2, D.C. Dinca1,2, J. Enders1, A. Gade1, T.Glasmacher1,2, P.G. Hansen1,2, J.L. Lecouey1,W.F. Mueller1,H. Olliver1,2, B.M. Sherrill1,2, J.A. Tostevin3, K. Yoneda1 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA 2Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 3School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK

  2. 20 28 20 8 8 16 Neutron Knockout from Intermediate Energy Beams of 26,28Ne • Direct quantitative observation of negative parity intruder configuration in 28Ne. • First observation of the level structure of 27Ne. Z 28Ne N

  3. KNOCKOUT REACTION IN INVERSE KINEMATICS AT ENERGIES OF 60-100 MeV/nucleon E A A-1 kA-1 • Observables: • Cross section of nucleon-removal reaction • Population fraction to individual excited states by detection of coincident transition gamma rays • Longitudinal momentum distribution of reaction residue • Three-body reaction theory based on Sudden and Eikonal approximations: • Core-target and nucleon-target S-matrices calculated from Glauber theory • Core-nucleon interaction modeled by a two-body Wood-Saxon potential

  4. 9Be(26Ne,25Ne)X J.R. Terry, J.L. Lecouey, Nucl. Phys. A734 (2004) 469-472

  5. Segmented Germanium Detector Array SeGA S800 Spectrograph Focal Plane Yellow arrow indicates beam path

  6. 0.830(17) % 0.170(17) % E [keV] Branch [%] 885(5) 48.1(21) 119(3) keV 765(5) 14.2(16) 0 9Be(28Ne,27Ne)X Gamma-gamma analysis 765 keV gated Inclusive Cross Section: 66.7(33) mb First observation of excited states in 27Ne: three gamma transitions: 119(3), 765(5), 885(5) keV. 37.7(20) % of events have no observed coincident transition gamma rays 885 keV gated 119 keV 9Be(28Ne,27Ne)X

  7. Momentum Distributions 765 keV 885 keV l=3 765 and 885 keV coincident events have momentum distributions characteristic of an l=2 neutron removal l=2 l=0 Longitudinal Momentum Distribution [GeV/c] Events with no coincident transition gamma Momentum distribution for events with no coincident transition gamma ray is not consistent with any single-l valued distribution. Combination of l=0 and l=3, 12% and 88%, respectively, fits the data. l=3 l=3 l=2 l=0 Longitudinal Momentum Distribution [GeV/c]

  8. E [MeV] 83.0(17) % 17.0(17) % 0.885(5) 0.765(5) X 0.000 Results 27Ne

  9. 2 Sn=1.43 MeV 1 0 Comparison to USD USD Exp

  10. 5/2+ 1/2- 7/2- 5/2+ 3/2+ 5/2- 1/2+ 3/2+ 3/2- [330]1/2- [202]3/2+ [200]1/2+ NILSSON DIAGRAM FOR N,Z < 20 a = - 0.5 a = - 3.5 2 1 0

  11. Comparison of the (28Ne,27Ne) f7/2 Spectroscopic Factor with fp-shell occupancies from the Monte Carlo Shell Modela) a) Y. Utsuno, T. Otsuka, T. Mizusaki and M. Honma, Phys. Rev. C 60, 054315 (1999)

  12. Outlook • Complete analysis of 28Ne Angular distributions of de-excitation gamma rays • Analyze single-neutron removal from 30,32Mg 32Mg 30Mg

  13. Neutron Knockout from Intermediate Energy Beams of 26,28Ne J.R. Terry1,2, D. Bazin1, B.A.Brown1,2, C.M. Campbell1,2, J.A. Church1,2, J.M. Cook1,2, A.D. Davies1,2, D.C. Dinca1,2, J. Enders1, A. Gade1, T.Glasmacher1,2, P.G. Hansen1,2, J.L. Lecouey1,W.F. Mueller1,H. Olliver1,2, B.M. Sherrill1,2, J.A. Tostevin3, K. Yoneda1 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA 2Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 3School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK

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