Keshelashvili,%20I.
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Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron

The A2 collaboration Aguar-Bartolome, P. ; Annand, J.R.M. ; Arends, H.J. ; et al.
Phys.Rev.C 88 (2013) 044601, 2013.
Inspire Record 1237227 DOI 10.17182/hepdata.64391

The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. In the present experiment, this reaction was searched for in the 3pi^0 p final state, by assuming K^0_S -> pi^0 pi^0 and Sigma^+ -> pi^0 p. The experimental results include total and differential cross sections as well as the polarization of the recoil hyperon. The new data significantly improve empirical knowledge about the g p -> K^0 Sigma^+ reaction in the measured energy range. The results are compared to previous measurements and model predictions. It is demonstrated that adding the present g p -> K^0 Sigma^+ results to existing data allowed a better description of this reaction with various models.

4 data tables
Table 1

The differential cross section for photon energies 1125, 1175 and 1225 MeV.

Table 2

The differential cross section for photon energies 1275, 1325, 1375 and 1425 MeV.

Table 3

The recoil polarization of the SIGMA+ for photon energy 1125, 1175 and 1225 MeV.

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Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)

The Crystal Ball at MAMI collaboration McNicoll, E.F. ; Prakhov, S. ; Strakovsky, I.I. ; et al.
Phys.Rev.C 82 (2010) 035208, 2010.
Inspire Record 860725 DOI 10.17182/hepdata.56733

The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 =< W >= 1.87 GeV). Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz Microtron MAMI-C and momentum analyzed by the Glasgow Tagging Spectrometer were used for the eta-meson production. Our accumulation of 3.8 x 10^6 gp-->etap-->3pi0p-->6gp events allows a detailed study of the reaction dynamics. The gp-->etap differential cross sections were determined for 120 energy bins and the full range of the production angles. Our data show a dip near W = 1680 MeV in the total cross section caused by a substantial dip in eta production at forward angles. The data are compared to predictions of previous SAID and MAID partial-wave analyses and to thelatest SAID and MAID fits that have included our data.

121 data tables
Table 1

Total cross section for the reaction GAMMA P --> ETA P.

Table 2

Differential cross section for the reaction GAMMA P --> ETA P at a photon energy of 710.4 MeV. The errors in the table are statistical only and there is an overall systematic uncertainty of 4.3 PCT.

Table 3

Differential cross section for the reaction GAMMA P --> ETA P at a photon energy of 714.5 MeV. The errors in the table are statistical only and there is an overall systematic uncertainty of 4.3 PCT.

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Neutron-proton charge-exchange amplitudes at 585-MeV

Chiladze, D. ; Carbonell, J. ; Dzyuba, A. ; et al.
2008.
Inspire Record 803150 DOI 10.17182/hepdata.52344

The differential cross section and deuteron analysing powers of the dp -> {pp}n charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using a deuteron beam of energy 1170 MeV, data were obtained for small momentum transfers to a {pp} system with low excitation energy. A good quantitative understanding of all the measured observables is provided by the impulse approximation using known neutron-proton amplitudes. The proof of principle achieved here for the method suggests that measurements at higher energies will provide useful information in regions where the existing np database is far less reliable.

6 data tables
Table 1

Differential cross section for the unpolarized DEUT P --> P P N reaction integrated over momentum transfer Q < 100 MeV.

Table 2

Unpolarized differential cross section for the DEUT P --> P P N reaction of (P P) excitation energies < 3 MeV.

Table 3

Spherical tensor analysing powers t20 and t22 for EPP 0.1 to 1.0 MeV and cos(theta) > 0.5.

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Observation of inverse diproton photodisintegration at intermediate energies

Komarov, V. ; Azaryan, T. ; Chiladze, D. ; et al.
Phys.Rev.Lett. 101 (2008) 102501, 2008.
Inspire Record 787271 DOI 10.17182/hepdata.50532

The reaction pp->{pp}_s\gamma, where {pp}_s is a proton pair with an excitation energy E_{pp}<3 MeV, has been observed with the ANKE spectrometer at COSY-Juelich for proton beam energies of T_p=0.353, 0.500, and 0.550 GeV. This is equivalent to photodisintegration of a free 1S_0 diproton for photon energies E\gamma ~ T_p/2. The differential cross sections measured for c.m. angles 0 deg.<\theta_{pp}<20 deg. exhibit a steep increase with angle that is compatible with E1 and E2 multipole contributions. The ratio of the measured cross sections to those of np->d\gamma is on the 10^{-3}-10^{-2} level. The increase of the pp->{pp}_s\gamma cross section with T_p might reflect the influence of the Delta(1232) excitation.

3 data tables
Table 1

Differential cross section in the centre of mass system for individual protons of kinetic energy 0.353 GeV. Errors shown are statistics plus uncertainties in background estimation.

Table 2

Differential cross section in the centre of mass system for individual protons of kinetic energy 0.500 GeV. Errors shown are statistics plus uncertainties in background estimation.

Table 3

Differential cross section in the centre of mass system for individual protons of kinetic energy 0.550 GeV. Errors shown are statistics plus uncertainties in background estimation.


Precision measurement of the quasi-free p n --> d Phi reaction close to threshold.

Maeda, Y. ; Hartmann, M. ; Keshelashvili, I. ; et al.
Phys.Rev.Lett. 97 (2006) 142301, 2006.
Inspire Record 720728 DOI 10.17182/hepdata.31513

The quasi-free pn->dphi reaction has been studied at the Cooler Synchrotron COSY-Juelich, using the internal proton beam incident on a deuterium cluster-jet target and detecting a fast deuteron in coincidence with the K+K- decay of the phi-meson. The energy dependence of the total and differential cross sections are extracted for excess energies up to 80 MeV by determining the Fermi momentum of the target neutron on an event-by-event basis. Though these cross sections are consistent with s-wave production, the kaon angular distributions show the presence of p waves at quite low energy. Production on the neutron is found to be stronger than on the proton but not by as much as for the eta-meson.

3 data tables
Table 1

Differential cross section dependence on the angle of the K+ from the PHI decay in the PHI rest frame.

Table 2

Differential cross section dependence on the polar angle of the PHI in the overall rest frame.

Table 3

Total cross section as a function of the excess energy.