Abstract.
We have investigated the ability of AGATA triple clusters to measure the linear polarization of gamma rays, exploiting the azimuthal-angle dependence of the Compton scattering differential cross section. To this aim, partially polarized gamma rays have been produced by Coulomb excitation of the first excited state of 104Pd and 108Pd, which decay to the ground state by emission of gamma rays of 555.8 keV and 433.9 keV, respectively. Pulse-shape analysis and gamma-ray tracking techniques have been used to determine the position and time sequence of the interaction points inside the germanium crystals. Anisotropies in the detection efficiency have been taken into account using 661.6 keV gammas from a 137Cs radioactive source. We obtain an average analyzing power of 0.451(34) at 433.9 keV and 0.484(24) at 555.8 keV.
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References
S. Akkoyun et al., Nucl. Instrum. Methods A 668, 26 (2012)
AGATA Collaboration (E. Farnea et al.), Nucl. Instrum. Methods A 621, 341 (2010)
M.A. Deleplanque et al., Nucl. Instrum. Methods A 430, 292 (1999)
S. Paschalis et al., Nucl. Instrum. Methods A 709, 44 (2013)
A. Gadea et al., Nucl. Instrum. Methods A 654, 88 (2011)
A.M. Stefanini et al., Nucl. Phys. A 701, 217 (2002)
B. Melon et al., EPJ Web of Conferences 66, 11004 (2014)
B. Alikhani et al., Nucl. Instrum. Methods A 675, 144 (2012)
A. Khaplanov et al., Nucl. Instrum. Methods A 593, 459 (2008)
T. Czosnyka, D. Cline, C.Y. Wu, GOSIA Manual, NSRL Report, University of Rochester (1983)
A.J. Ferguson, Angular correlation methods in gamma-ray spectroscopy (North-Holland Publishing Company, 1965)
D.D. Watson, G.I. Harris, Nucl. Data Sheets 3, 25 (1967)
K. Alder, A. Winther, Electromagnetic Excitation (North-Holland Publishing Company, 1966)
N. Bree et al., Phys. Rev. C 78, 047301 (2008)
A.M. Hurst et al., Phys. Rev. Lett. 98, 072501 (2007)
M. Suffert et al., Physica 25, 659 (1959)
R. Venturelli, D. Bazzacco, LNL Annual Report 2004, (2005) p. 220
A. Lopez-Martens et al., Nucl. Instrum. Methods A 533, 454 (2004)
N.J. Hammond et al., Nucl. Instrum. Methods A 547, 535 (2005)
B. Schlitt et al., Nucl. Instrum. Methods A 337, 416 (1994)
P.A. Söderström et al., Nucl. Instrum. Methods A 638, 96 (2011)
L.W. Fagg, S. Hanna, Rev. Mod. Phys. 31, 711 (1959)
B.A. Logan, Nucl. Instrum. Methods 108, 603 (1973)
J. Simpson et al., Nucl. Instrum. Methods 204, 463 (1983)
A. von der Werth et al., Nucl. Instrum. Methods A 357, 458 (1995)
D. Miller et al., Nucl. Instrum. Methods A 581, 713 (2007)
R.G. Stokstad et al., Nucl. Phys. A 92, 319 (1967)
G.G. Seaman, J. de Boer, Nucl. Phys. A 139, 692 (1969)
J. de Boer, J. Eichler, Adv. Nucl. Phys. 1, 1 (1968)
L. Hasselgren et al., Nucl. Phys. A 264, 341 (1976)
L.E. Svensson et al., Nucl. Phys. A 584, 547 (1995)
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Communicated by D. Pierroutsakou
This paper is dedicated to the memory of Enrico Farnea, dear friend and excellent physicist.
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Bizzeti, P.G., Sona, P., Michelagnoli, C. et al. Analyzing power of AGATA triple clusters for gamma-ray linear polarization. Eur. Phys. J. A 51, 49 (2015). https://doi.org/10.1140/epja/i2015-15049-4
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DOI: https://doi.org/10.1140/epja/i2015-15049-4