HEPData Search

Showing 3 of 3 results

Observation of a (Sigma)He-4 bound state in the He-4(K-,pi-) reaction at 600-MeV/c.

Nagae, T. ; Miyachi, T. ; Fukuda, T. ; et al.

Phys.Rev.Lett. 80 (1998) 1605-1609, 1998.

Inspire Record 468090 DOI 10.17182/hepdata.19553

We have observed a clear peak below the Σ+-production threshold in the 4He(K−,π−) reaction at 600MeV/c and θKπ=4∘. This is confirmation of the existence of the bound state of Σ4He, which was reported in the 4He(stoppedK−,π−) reaction. As in the case of stopped kaons, no such peak was found in the 4He(K−,π+) spectrum. Quantitatively reliable parameters for this level have been established. The binding energy and the width of the bound state are 4.4±0.3(stat)±1(syst) MeV and 7.0±0.7(stat)−0.0+1.2(syst) MeV, respectively.

1 data table

Table 1

$HE4/S represents the HE4/SIGMA+ bound state.

K+ elastic scattering from C and Li-6 at 715-MeV/c

Michael, R. ; Barakat, M.B. ; Bart, S. ; et al.

Phys.Lett.B 382 (1996) 29-34, 1996.

Inspire Record 328538 DOI 10.17182/hepdata.28355

Elastic differential cross sections for K + mesons scattered from nat C and 6 Li targets have been measured at an incident momentum of 715 MeV/c and at angles of 7° to 42° in the laboratory frame. The experimental cross sections agree, within errors, with two different parameter-free impulse approximation calculations. To reduce the effects of the systematic errors, the ratio of the experimental cross sections for nat C to 6 Li is compared to the theoretical values, and these ratios do not agree with theory. This discrepancy suggests either a density-dependent alteration of K + -nucleon amplitudes or a failure of the optical potential calculations to describe these nuclides adequately.

2 data tables

Table 1

No description provided.

Table 2

No description provided.