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NUSTAR 05 - 1 Neutron Knockout from Intermediate Energy Beams of 26,28 Ne J.R. Terry 1,2, D. Bazin 1, B.A.Brown 1,2, C.M. Campbell 1,2, J.A. Church 1,2,

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Presentation on theme: "NUSTAR 05 - 1 Neutron Knockout from Intermediate Energy Beams of 26,28 Ne J.R. Terry 1,2, D. Bazin 1, B.A.Brown 1,2, C.M. Campbell 1,2, J.A. Church 1,2,"— Presentation transcript:

1 NUSTAR 05 - 1 Neutron Knockout from Intermediate Energy Beams of 26,28 Ne J.R. Terry 1,2, D. Bazin 1, B.A.Brown 1,2, C.M. Campbell 1,2, J.A. Church 1,2, J.M. Cook 1,2, A.D. Davies 1,2, D.C. Dinca 1,2, J. Enders 1, A. Gade 1, T.Glasmacher 1,2, P.G. Hansen 1,2, J.L. Lecouey 1,W.F. Mueller 1,H. Olliver 1,2, B.M. Sherrill 1,2, J.A. Tostevin 3, K. Yoneda 1 1 National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA 2 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 3 School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK

2 NUSTAR 05 - 2 Neutron Knockout from Intermediate Energy Beams of 26,28 Ne Direct quantitative observation of negative parity intruder configuration in 28 Ne. First observation of the level structure of 27 Ne. Z N 28 Ne

3 NUSTAR 05 - 3 KNOCKOUT REACTION IN INVERSE KINEMATICS AT ENERGIES OF 60-100 MeV/nucleon A A-1 EE k A-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 NUSTAR 05 - 4 9 Be( 26 Ne, 25 Ne)X J.R. Terry, J.L. Lecouey, Nucl. Phys. A734 (2004) 469-472 E level JπJπ lb [%]σ sp [mb]σ obs [mb]C 2 S obs C 2 S th E th 01/2 + 048(7)41.746(7)1.1(2)1.3470 17035/2 + 222(6)21.521(6)1.0(3)2.3461.779 33165/2 + 221(3)19.320(3)1.0(2)1.8372.971

5 NUSTAR 05 - 5 S800 Spectrograph Segmented Germanium Detector Array SeGA Focal Plane Yellow arrow indicates beam path

6 NUSTAR 05 - 6 9 Be( 28 Ne, 27 Ne)X Inclusive Cross Section: 66.7(33) mb First observation of excited states in 27 Ne: three gamma transitions: 119(3), 765(5), 885(5) keV. 37.7(20) % of events have no observed coincident transition gamma rays Gamma-gamma analysis 885(5) 48.1(21) 765(5) 14.2(16) 0.830(17) %0.170(17) % E [keV] Branch [%] 119(3) keV 0 119 keV 9 Be( 28 Ne, 27 Ne)X 765 keV gated 885 keV gated

7 NUSTAR 05 - 7 l=0 l=3 l=2 l=3 l=0 l=2 l=3 765 keV885 keV Events with no coincident transition gamma Momentum Distributions 765 and 885 keV coincident events have momentum distributions characteristic of an l=2 neutron removal 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. Longitudinal Momentum Distribution [GeV/c]

8 NUSTAR 05 - 8 Results JπJπ l σ partial [mb] σ sp [mb]C 2 S obs (3/2,5/2) + 232.1(21)23.61.36(9) (3/2,5/2) + 29.5(11)23.60.40(5) 7/2 - 322.1(21)23(1)0.96(10) (1/2 + )(0)3.00(64)44.40.068(14) 83.0(17) %17.0(17) % 0.000 0.765(5) 0.885(5) X E [MeV] 27 Ne

9 NUSTAR 05 - 9 Comparison to USD 1 0 2 3/2 + 21.58 1/2 + 01.35 5/2 + 20.04 3/2 + 20.10 5/2 + 21.08 JπJπ lC2SC2SJπJπ lC2SC2S (1/2 + )(0)0.068(14) 7/2 - 30.96(10) (3,5)/2 + 20.40(5) (3,5)/2 + 21.36(9) S n =1.43 MeV USDExp

10 NUSTAR 05 - 10 NILSSON DIAGRAM FOR N,Z < 20 a = - 3.5 a = - 0.5 1 0 2 [200]1/2 + 1/2 + [202]3/2 + 3/2 + [330]1/2 - 3/2 - 3/2 + 5/2 + 7/2 - 1/2 - 5/2 - 5/2 +

11 NUSTAR 05 - 11 Comparison of the ( 28 Ne, 27 Ne) f 7/2 Spectroscopic Factor with fp-shell occupancies from the Monte Carlo Shell Model a) a) Y. Utsuno, T. Otsuka, T. Mizusaki and M. Honma, Phys. Rev. C 60, 054315 (1999)

12 NUSTAR 05 - 12 Outlook Complete analysis of 28 Ne Angular distributions of de-excitation gamma rays Analyze single-neutron removal from 30,32 Mg 30 Mg 32 Mg

13 NUSTAR 05 - 13 Neutron Knockout from Intermediate Energy Beams of 26,28 Ne J.R. Terry 1,2, D. Bazin 1, B.A.Brown 1,2, C.M. Campbell 1,2, J.A. Church 1,2, J.M. Cook 1,2, A.D. Davies 1,2, D.C. Dinca 1,2, J. Enders 1, A. Gade 1, T.Glasmacher 1,2, P.G. Hansen 1,2, J.L. Lecouey 1,W.F. Mueller 1,H. Olliver 1,2, B.M. Sherrill 1,2, J.A. Tostevin 3, K. Yoneda 1 1 National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA 2 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 3 School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK

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