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INDIRECT DETERMINATION OF NEUTRON CAPTURE CROSS SECTIONS ON SPHERICAL AND NEAR-SPHERICAL NUCLEI USING THE SURROGATE METHOD Bethany L. Goldblum Berkeley Nuclear Research Center Department of Nuclear Engineering University of California, Berkeley
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T HE S URROGATE M ETHOD Nuclear Reactions Schematic 93 Mo * PnPn PP n Desired Reaction d Direct Reaction p 92 Mo 92 Mo(d,p ) 93 Mo 92 Mo(n, ) 94 Mo(d,p ) 95 Mo 94 Mo(n, )
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M ETHODOLOGY Absolute Surrogate Measurement Surrogate Ratio Measurement
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E XPERIMENTAL M ETHODS STARS-LiBerACE 11 MeV Deuteron Beam 92 Mo: 460 ± 5 μg/cm 2 Target- E spacing: 9 mm 94 Mo: 250 ± 6 μg/cm 2 Target- E spacing: 21 mm
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Discrete -ray Tagging Statistical -ray Tagging IDENTIFICATION OF THE NUMBER OF -CASCADES IN COINCIDENCE WITH THE SURROGATE REACTION EJECTILE
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Discrete -ray Tagging Statistical -ray Tagging IDENTIFICATION OF THE NUMBER OF -CASCADES IN COINCIDENCE WITH THE SURROGATE REACTION EJECTILE Energy (keV) 93 Mo: E peak = 943 keV E x = 8000-8100 keV
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IDENTIFICATION OF THE NUMBER OF -CASCADES IN COINCIDENCE WITH THE SURROGATE REACTION EJECTILE Discrete -ray Tagging Statistical -ray Tagging Energy (keV) 93 Mo: E = 6-7 MeV E x = 8000-8100 keV
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92 M o ( n, ) C ROSS S ECTION Absolute Surrogate Measurement
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92 M o ( n, ) C ROSS S ECTION Surrogate Ratio Measurement
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E VALUATION OF - DECAY TAGGING TECHNIQUES -decay probability of 93 Mo and 95 Mo
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E VALUATION OF - DECAY TAGGING TECHNIQUES Ratio of the Statistical to Discrete Tag
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CONCLUSIONS 1.First use of the surrogate method in the indirect determination of neutron-induced reaction cross sections on spherical and quasi-spherical nuclei 1.To improve the discrete tag, empirical data on nuclear level schemes could be used to sum parallel decay paths 2.To improve the statistical tag, the -ray energy range should be constrained to isolate primary -transitions 3.Discrete and statistical -decay tags likely capture similar information for more deformed nuclei B.L. Goldblum, et al., Phys. Rev C 85, 054616 (2012). 1.First use of the surrogate method in the indirect determination of neutron-induced reaction cross sections on spherical and quasi-spherical nuclei 1.To improve the discrete tag, empirical data on nuclear level schemes could be used to sum parallel decay paths 2.To improve the statistical tag, the -ray energy range should be constrained to isolate primary -transitions 3.Discrete and statistical -decay tags likely capture similar information for more deformed nuclei B.L. Goldblum, et al., Phys. Rev C 85, 054616 (2012).
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COLLABORATORS M. Wiedeking, L.A. Bernstein, D.L. Bleuel, F.S. Dietrich, R. Hatarik, S.R. Lesher, N.D. Scielzo P.T. Lake, I.-Y. Lee, S. Pachalis, M. Petri, L. Phair K. Alfonso, R. Vial, J. Vujic T. Reed J.M. Allmond
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