Few Nucleon Studies at TUNL 1. The Nd A y Puzzle: (a) Refinement of NN 3 P J Phase Shifts: high-precision np and pp A y measurements (b) Complete Picture.

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Presentation transcript:

Few Nucleon Studies at TUNL 1. The Nd A y Puzzle: (a) Refinement of NN 3 P J Phase Shifts: high-precision np and pp A y measurements (b) Complete Picture of Energy Dependence of Discrepancy: new Nd A y measurements 2. The A y Puzzle in the 4N system: measurements with polarized 3 He target 3. Discrepancies in nd Breakup: new cross-section measurements

Nd A y Puzzle: Refinement of 3 P J np Phase Shifts Proposal: Measurement of A y (  ) for np Elastic Scattering at 7.6 and 18.5 MeV PI: W. Tornow Participants C.R. Howell, Duke Univ. J.H. Kelley, NC State Univ. R.L. Walter, Duke Univ. A. Crowell (Postdoc) J. Deng (Graduate Student) M. Kiser (Graduate Student) R. Macri (Graduate Student/Postdoc) B.J. Crowe (NC Central University) R.S. Pedroni (NC A&T State University) G.J. Weisel, Penn State at Altoona

Status of Low-Energy np 3 P J Phase Shifts (1988) (1994) Experimental Details: 7.6 MeV 18.5 MeV Number data points: Accuracy (±3%): ± ± Accelerator: tandem tandem Neutron Source: 2 H(d,n) 2 H(d,n) Target Area: NSSA NSSA Counting time: 120 days 40 days

Nd A y Puzzle: Refinement of 3 P J pp Phase Shifts Proposal: Measurement of A y (  ) for pp Elastic Scattering at 6.14 and 15.6 MeV PIs: H.J. Karwowski and E.J. Ludwig Participants T.C. Black, UNC-Wilmington T.B. Clegg, UNC-Chapel Hill M.S. Boswell (Graduate Student) T.V. Daniels (Graduate Student) B.M. Fisher (Graduate Student) D. Gupta (Postdoc) T. Katabuchi (Postdoc) D.S. Leonard (Graduate Student)

Status of Low-Energy pp 3 P J Phase Shifts

Experimental Details of pp Ay Measurements Experimental Details: 6.14 MeV 15.6 MeV Number data points: Accuracy (±5%): ± ± Accelerator: tandem tandem Target Area: Gas Jet Gas Jet

Nd A y Puzzle: Complete Energy dependence of nd A y Discrepancy Proposal: Measurement of A y (  ) for nd Elastic Scattering at 0.65, 19.0, 28.0 and 35.0 MeV PIs: W. Tornow and G.J. Weisel (Penn State at Altoona) Participants C.R. Howell, Duke Univ. J.H. Kelley, NC State Univ. D.M. Markoff, NC State Univ. R.L. Walter, Duke Univ. A. Crowell (Postdoc) J. Deng (Graduate Student) M. Kiser (Graduate Student) R. Macri (Graduate Student/Postdoc) B.J. Crowe (NC Central University) R.S. Pedroni (NC A&T State University) H. Witała (Jagellonian Univ., Cracow, Poland) W. Glöckle (Univ. of Bochum, Bochum, Germany)

3NF in NNLO EFT Calculations E. Epelbaum, A. Nogga, W. Gleockle, H. Kamada, Ulf-G. Mei  ner and H. Witała, arXiv:nucl-th/ v1 13 Aug NF TPE OPEContact E n = 3 MeV

EFT Calculations E n = 3 MeV NLONNLO E n = 10 MeV E n = 65 MeV

Energy Dependence of Discrepancy in Nd A y Puzzle

Experimental Details of LE nd A y Measurements Experimental Parameters Tandem Accelerator NTOF Target Room E n = 650 keV 7 Li(p,n) source reaction  A y = ±0.001 Counting time: 25 days

Experimental Details of HE nd A y Measurements Experimental Parameters Tandem Accelerator Neutron Shielded Source Area E n = 19, 28 and 35 MeV 2 H(d,n) and 3 H(d,n) source reactions  A y = ±0.005 Counting times: 40 days at 19 MeV 60 days at 28 MeV 60 days at 35 MeV

LE pd A y Measurements PIs: H.J. Karwowski and E.J. Ludwig Participants T.C. Black, UNC at Wilmington T.B. Clegg, UNC-Chapel Hill M.S. Boswell (Graduate Student/MS work) T.V. Daniels (Graduate Student) B.M. Fisher (Graduate Student) D. Gupta (Postdoc) T. Katabuchi (Postdoc) D.S. Leonard (Graduate Student) A. Kievsky, INFN, Sezione di Pisa M. Viviani, INFN, Sezione di Pisa Experimental Details: 650 keV 1.0 MeV Number data points: Accuracy : ± ± Accelerator: tandem tandem Target Area: Gas Jet Gas Jet

Proposal to Measure A 0y for p 3 He Elastic-Scattering with a Polarized 3 He Target PI: T.B. Clegg Participants H.J. Karwowski, UNC-Chapel Hill E.J. Ludwig, UNC-Chapel Hill M.S. Boswell (Graduate Student) T.V. Daniels (Graduate Student/MS project) B.M. Fisher (Ph.D. thesis project) D. Gupta (Postdoc) T. Katabuchi (Postdoc) D.S. Leonard (Graduate Student) A. Kievsky, INFN, Sezione di Pisa M. Viviani, INFN, Sezione di Pisa

The A y Puzzle in the 4N system

p 3 He Elastic Scattering: Comparison of A y0 and A 0y

Sensitivity of p 3 He to NN 3 P J Potential

Verification of Selected Neutron-Deuteron Breakup Cross-Section Data PIs: C.R. Howell W. Tornow and R.L. Walter Participants A. Crowell (Postdoc) J. Deng (Ph.D. thesis project) M. Kiser (Graduate Student) R. Macri (Graduate Student/Postdoc) C. Jackson (NC A&T State University) R.S. Pedroni (NC A&T State University) B.J. Crowe (NC Central University) W. von Witsch (Univ. of Bonn) H. Witała (Jagellonian Univ., Cracow, Poland) W. Glöckle (Univ. of Bochum, Bochum, Germany)

1. Space Star Anomaly 2. nn FSI Main Discrepancies in nd Breakup  1 S 0 a nn 3. 0° proton energy spectrum  1 S 0 a nn (a)  - + d  n + n + p  a nn = ± 0.3 ± 0.3 fm (PSI, 1984 and 1987 and LAMPF, 1998) (b) n +d  n + n + p TUNL: a nn = ± 0.5 fm (1999) Bonn: a nn = ± 0.4 fm (2000)  4. nn QFS (recent data from von Witsch’s group in Bonn) 

Space Star Anomaly d 5  /d  1 d  2 dS (mb/sr 2 MeV) nd data, TUNL 1996 nd data, Erlangen Univ pd data, Univ. Cologne 1991

Energy Dependence

Current Setup: coincidence geometry

Proposed Setup: recoil geometry Systematic Differences with present setup: (1) Measured cross section only depends on relative efficiency of one neutron det. (2) Only modest correction for neutron attenuation (3) Need correction for neutron loss when both neutrons are in solid angle of det. (4) Can perform simultaneous measurements of identical configurations using recoil-geometry setup with coincidence-geometry setup behind it.