Λ spin-orbit splitting deduced from dwia analysis of the 89 y (π + ,k + ) Λ 89 y reaction
DESCRIPTION
Λ spin-orbit splitting deduced from DWIA analysis of the 89 Y (π + ,K + ) Λ 89 Y reaction. T. Motoba (Osaka E-C U.) D.J. Millener (Brookhaven N.L.) D. Lanskoy (Moscow State U.) Y. Yamamoto (Tsuru U.). (π+,K+) reaction characteristics. - PowerPoint PPT PresentationTRANSCRIPT
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Λ spin-orbit splitting deduced from DWIA analysis of
the 89Y(π+,K+) Λ89Y reaction
T. Motoba (Osaka E-C U.)D.J. Millener (Brookhaven N.L.)D. Lanskoy (Moscow State U.)
Y. Yamamoto (Tsuru U.)
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(π+,K+) reaction characteristics
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T.Motoba, H. Bando, R. Wunsch, J.Zofka, Phys. Rev.C38 (1988)
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H. Hotchi et al,Phys. Rev. C64044302 (2001).
Great achievementgood resolution Γ=1.65 MeV
Ls splitting (ΔE): (f )=1.70 MeV (d)=1.63 (p)= 1.37
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High resolution γ-ray mesurements
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How to understand “large” splitting of subpeaks observed in heavy systems
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ΔE is not proportional to (2l+1)
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XS ratio is determined as
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EXP vs. DWIA CAL(WS, VLS=4.3MeV)
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Take core-excited states seriously : up to the level of p-shell
hypernuclei
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CONCLUSION (1)Reproduce cross section ratios among a series of pronounced peaks and sub-peaks.
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CONCLUSION(2) Observed energy spacing between doublet li
ke sub-peaks (3L-3R) are reproduced wit
h δ(f)=0.20 MeV, which leads to δ(d)=0.15 M
eV and δ(p)=0.09 MeV.
(cf. Λ 13 C:δ(p)=0.152+-0.07 MeV)
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CONCLUSION
(3) even the GS peak should consists of two components. (See the exp. GS peak The present analysis leads to the prediction that.)
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CONCLUSION (4) Right partner(s) contain parity-mixing
contributions :example for 3R: [1p1/2f7/2hole] Λ ( d3/2 )
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New insight into (π+,K+) spectra for other medium-heavy hypernuclei
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END
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