A.I. L’vov, P.N. Lebedev Institute of Physics, Moscow, Russia and M.I. Levchuk, B.I. Stepanov...
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Transcript of A.I. L’vov, P.N. Lebedev Institute of Physics, Moscow, Russia and M.I. Levchuk, B.I. Stepanov...
A.I. L’vov,P.N. Lebedev Institute of Physics, Moscow, Russia
andM.I. Levchuk,
B.I. Stepanov Institute of Physics, Minsk, Belarus
On possible inconsistency of data on the total photoabsorption cross section for the
deuteron in the Δ region
There are two measurements of the total photoabsorption cross section on the deuteron in the first resonance region:1) Armstrong T.A. et al. The total deuteron hadronic cross section
in the energy range 0.265–4.215 GeV, Nucl. Phys. B41, 445 (1972). (Daresbury, England)
2) MacCormick M. et al. Total photoabsorption cross sections for from 200 to 800 MeV, Phys. Rev. C53, 41 (1996). (Mainz, Germany)
PDG2014
1 2 3H, H, and He
Partial channels in below 500 MeV
1) Deuteron photodisintegration ;2) Coherent photoproduction ;3) Incoherent photoproduction ; 4) Incoherent photoproduction ; 5) Incoherent photoproduction
d X
d pn 0 0d d 0 0d pn
d pp .d nn
Armstrong T.A. et al. Nucl. Phys. B41, 445 (1972)
Summing over five channels1) Deuteron photodisintegration.There is rich experimental information on this channel. We take the total cross section from experiments with tagged photons only and fit them using the following formula
Data are from Arends J. et al., Nucl. Phys. A412, 509 (1984) (○);Crawford R. et al., Nucl. Phys. A603, 303 (1996) (●);Blanpied G. et al., Phys. Rev. C61, 024604 (1999) (□).
2 3 41 2
6 5
( )1 ( )
Cd pn
C CC eC C
2) Coherent photoproduction . .There are data from MainzKrusche B. et al., Eur. Phys. J. A6, 309 (1999) (□);Siodlaczek U. et al, Eur. Phys. J. A10, 365 (2001) (●).We fit them using the following formula
0 0d d
0
2 31 2 3 4
26 5
( )1 ( )d d
D D D DD D
3) Incoherent photoproduction .There are data from Mainz obtained in the same experimentsKrusche B. et al., Eur. Phys. J. A6, 309 (1999) (○);Siodlaczek U. et al, Eur. Phys. J. A10, 365 (2001) (●).We fit them using the same formula
0 0d pn
0
2 31 2 3 4
26 5
( )1 ( )d pn
D D D DD D
4) Incoherent photoproduction .There are data from Benz P. et al, Nucl. Phys. B65, 158 (1973) (∎);Chiefari G. et al. Lett. Nuovo Cim. 13, 129 (1975) (Δ); Asai M. et al, Phys. Rev. C42, 837 (1990) (□).
We also use our modelL.M. et al. Phys. Rev. C74, 014004 (2006);L.M. Phys. Rev. C82, 044002 (2010).
d pp
5) Incoherent photoproduction .There are no data on this reaction.
d nn
Final results
Armstrong T.A. et al. Nucl. Phys. B41, 445 (1972) ();MacCormick M. et al. Phys. Rev. C53, 41 (1996) ().
A consequence for the Baldin sum rule
An assumption
is not quite true.One should use the following integral equation
where
2 2
( ).
2th
N XN N d
n d p
ˆ( ) [ ( ) ( )] ( ),d p n pnF eff
effˆ ( ) ( ) ( ) .N z N zF W p d p
Babusci D. et al. Phys. Rev. C57, 291 (1998)
L’vov A.I. & L.M. Nucl. Phys. A674, 449 (2000)
Thank you for your attention!