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Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Hadron Structure and Spectroscopy XI

HK 64.3: Vortrag

Freitag, 18. März 2016, 14:45–15:00, S1/01 A5

Search for η-nucleus bound states by missing mass spectroscopy,∗∗ — •Stefan Friedrich1 and Yoshiki Tanaka2 for the EtaPrime collaboration — 1II. Physikalisches Institut, Justus-Liebig-Universität Gießen — 2University of Tokyo

In a search for η-mesic states in 11C the 12C(p,d) reaction has been studied at a proton beam energy of 2.5 GeV, using the fragment separator FRS at GSI in spectrometer mode, as proposed in [1,2]. Applying several Bρ settings of the FRS, the missing-mass spectrum was measured by analyzing the momentum of the ejectile deuterons through particle tracking with two multi-wire drift chambers in the dispersive focal plane, covering an excitation energy range in 11C of -90 MeV to +30 MeV with respect to the η production threshold. Particle identification was achieved by momentum and time-of-flight measurements. Backward elastic scattering in the D(p,d)p reaction was used for momentum calibration. Background processes such as multi-pion production were studied in the D(p,d)X reaction. The current status of the data analysis will be discussed. Upper limits for the population cross section of η11C states will be presented and compared to theoretical predictions [1,2].
H. Nagahiro et al., Phys. Rev. C 87 (2013) 045201
K. Itahashi et al., Prog. Theo. Phys. 128 (2012) 601
Funded by Grant-in-Aid for Young Scientists (A) (No.25707018) from JSPS
∗∗Experiment performed in the framework of the Super-FRS collaboration for FAIR

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