A new beam asymmetry measurement from pion photoproduction on the neutron using CLAS

for the; CLAS collaboration

doi:10.1088/1674-1137/33/12/057

Chinese Physics C> 2009, Vol. 33> Issue(12) : 1369-1372 DOI: 10.1088/1674-1137/33/12/057

A new beam asymmetry measurement from pion photoproduction on the neutron using CLAS

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Abstract：
We present a preliminary analysis of the photon beam asymmetry observable
(Σ) from the photoproduction reaction channel γn→pπ^－ in the invariant mass range 1.6—2.3 GeV. The measurement was obtained using the near-4π CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, USA, employing a linearly polarised photon beam with an energy range 1.1—2.3 GeV, incident on a liquid deuterium target. The measurement will provide new data to address the poorly established neutron excitation spectrum and will greatly expand the sparse world data-set both in energy and angle.

References

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. Burkert V, Lee T S H. Int. J. of Mod. Phys. E, 2004, 13:10352. Dugger M et al. Phys. Rev. C, 2007, 76: 0252113. Dugger M et al. Phys. Rev. C, accepted May 20094. Bradford R et al. Phys. Rev. C, 2006, 73: 0352025. Bradford R et al. Phys. Rev. C, 2007, 75: 0352056. Barker I, Donnachie A, Storrow J. Nucl. Phys. B,1975, 95:3477. Chiang W-T, Tabakin F. Phys. Rev. C, 1997, 55: 20548. Alspector J et al. Phys. Rev. Lett., 1972, 28: 14039. Abrahamian L et al. Sov. J. Nucl. Phys., 1980, 32: 6910. Adamyan F et al. J. Phys. G, 1989, 15: 179711. Sober D et al. Nucl. Instr. and Meth. A, 2000, 440: 26312. Mecking B et al. Nucl. Instr. and Meth. A, 2003, 503: 513

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for the and CLAS collaboration. A new beam asymmetry measurement from pion photoproduction on the neutron using CLAS[J]. Chinese Physics C, 2009, 33(12): 1369-1372. doi: 10.1088/1674-1137/33/12/057

for the and CLAS collaboration. A new beam asymmetry measurement from pion photoproduction on the neutron using CLAS[J]. Chinese Physics C, 2009, 33(12): 1369-1372. doi: 10.1088/1674-1137/33/12/057 shu

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Received: 2009-08-07
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

A new beam asymmetry measurement from pion photoproduction on the neutron using CLAS

for the
CLAS collaboration

Received Date: 2009-08-07
Accepted Date: 1900-01-01
Available Online: 2009-12-05

Abstract:

We present a preliminary analysis of the photon beam asymmetry observable
(Σ) from the photoproduction reaction channel γn→pπ^－ in the invariant mass range 1.6—2.3 GeV. The measurement was obtained using the near-4π CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, USA, employing a linearly polarised photon beam with an energy range 1.1—2.3 GeV, incident on a liquid deuterium target. The measurement will provide new data to address the poorly established neutron excitation spectrum and will greatly expand the sparse world data-set both in energy and angle.