Search for the Delta++ component in C-12 ground state using C-12(gamma, pi+ p) reaction

Bystritsky, V.M.; Fix, A.I.; Glavanakov, I.V.; Grabmayr, P.; Krechetov, Yu.F.; Saigushkin, O.K.; Schuvalov, E.N.; Tabachenko, A.N.

doi:10.1016/S0375-9474(02)00625-5

Search for the Delta++ component in C-12 ground state using C-12(gamma, pi+ p) reaction

V.M. Bystritsky
(
- Dubna, JINR
)
,
A.I. Fix
(
- Tomsk Polytechnic U.
)
,
I.V. Glavanakov
(
- Tomsk Polytechnic U.
)
,
P. Grabmayr
(
- Tubingen U.
)
,
Yu.F. Krechetov
(
- Tomsk Polytechnic U.
)

Dec, 2001

31 pages

Published in:

Nucl.Phys.A 705 (2002) 55-72

e-Print:

nucl-ex/0112013 [nucl-ex]

DOI:

10.1016/S0375-9474(02)00625-5

View in:

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Abstract:

The differential cross section for the

^{12}

C

(\gamma,\pi^{+}p)

reaction has been measured in the

\Delta

(1232) resonance region at high recoil momenta of the residual nuclear system. The data are analyzed under the assumption that the formation of the

\pi^+p

pairs may be interpreted as a

\gamma\Delta^{++}\to\pi^+p

process which takes place on a

\Delta^{++}

preexisting in the target nucleus. Estimates of the

\Delta^{++}

momentum distribution

\rho_{\Delta^{++}}(\bar{p})

=0.17 fm

^3

for a mean momentum

\bar{p}=300\pm49

MeV/c as well as the number of

\Delta

isobars per nucleon

N_\Delta=0.017

were obtained for

^{12}

C.

Note:

25 pages LaTeX2e, 7 eps figures

25.20.Lj
21.30.+y
Nuclear reactions
12 C( γ , pπ + )
E =420,500 MeV bremsstrahlung
Measured
E p
pπ -coin.
σ ( E , θ )
12 C deduced Δ resonance component

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