25–29 Sept 2017
Salamanca, Spain
Europe/Zurich timezone

Determination of the η'-nucleus potential at low momenta*

28 Sept 2017, 17:30
20m
Aula 2.7

Aula 2.7

Talk Hadrons in matter including hypernuclei Hadrons in matter including hypernuclei

Speaker

Dr Mariana Nanova (II. Phys. Inst., University of Giessen , Germany)

Description

The real part of the $\eta^\prime$-nucleus potential has been determined at low momenta by analyzing the $\eta^\prime$ kinetic energy distribution and the excitation function in photoproduction of of $\eta^\prime$ mesons off C in coincidence with forward going protons. The forward going protons take over most of the momentum of the incoming photon beam and thus their detection allows the study of the $\eta^\prime$-nucleus interaction at very low relative momentum. This experimental approach was previously used in the determination of the $\omega$ -nucleus potential [1]. The present measurement extends earlier determinations of the $\eta^\prime$ -nucleus potential at higher average momenta [2,3], towards the production threshold. A comparison of the data with calculations by E. Paryev [4] yields a potential depth of about -40 MeV. In agreement with [5], this indicates that the deep $\eta^\prime$ - nucleus potentials of $\ge$ 100 MeV, predicted in [6], can be excluded also at low momenta. Within the experimental uncertainties, there is no indication of a momentum dependence of the $\eta^\prime$ - Carbon potential.

$[$1$]$ S. Friedrich et al., Phys. Lett. B 87 (2013) 045201

$[$2$]$ M. Nanova et al., Phys. Lett. B 727 (2013) 417

$[$3$]$ M. Nanova et al., Phys. Rev. C 94 (2016) 025205

$[$4$]$ E. Paryev, J. Phys. G 43 (2016) 015106

$[$5$]$ Y. Tanaka et al., Phys. Rev. Lett. 117 (2016) 202501

$[$6$]$ H. Nagahiro et al., Phys. Rev. C 74 (2006) 045203

$^\ast$Supported by DFG through SFB/TR16.

Primary author

Dr Mariana Nanova (II. Phys. Inst., University of Giessen , Germany)

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