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- Adlarson, Patrik, et al.
(författare)
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Search for eta-mesic He-4 with the WASA-at-COSY detector
- 2013
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 87:3, s. 035204-
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Tidskriftsartikel (refereegranskat)abstract
- An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively.
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2. |
- Bright, TB, et al.
(författare)
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Radiative proton capture to discrete states in N-31 at 98 and 176 MeV
- 1997
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Ingår i: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 621:3, s. 754-766
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A high resolution magnetic pair spectrometer for medium energy photons has been used for studies of the exclusive (p,gamma) reaction on C-12 at 98 and 176 MeV, We present angular distributions of the differential cross section for transitions to the groun
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