Agent-Based Modeling for Investigating Adaptivity of

Misperception is a term which is generally used in a negative sense. However, when information promoting a certain kind of behavior is obtained, it can happen that the diversity of the behavior is enhanced by the misperceptions of the individual in the population, resulting in a situation in which misperception works advantageously for the population. This paper presents this view in terms of four hypotheses, dealing with (1) the basic adaptivity of misperception, (2) basic properties of communication, (3) the adaptivity of misperception in communication, and (4) the behavioral specificity of information in the adaptivity of misperception. A simple agent model for the resourcesearching problem is constructed. Direct misperception, which is misperception in the direct acquisition of information from the surrounding environment, and indirect misperception, which occurs when information is obtained through communication, are considered. Their effects are investigated by simulation experiments. It is shown that misperception enhances the diversity of agent behavior and can contribute to adaptivity. It is also shown that exact communication may decrease the diversity of agent behavior, and that adaptivity is decreased when false information is shared. A tendency for the adaptivity of misperception to decrease when the behavioral specificity in information terms is low is demonstrated. We believe that study of the adaptivity of misperception as a factor generating diversity will lead to new findings in cognitive science, memetics

Status of J-PARC E07: Systematic study of double strangeness nuclei with hybrid emulsion method

© 2019 Author(s). J-PARC E07 is the most complex emulsion experiment to date investigating double hypernuclei with a hybrid emulsion method. This experiment aims to detect 104 Ξ- stop events, ten times more events than the past experiments. Thus, an unequivocal identification of several new double hypernuclei is expected. The beam exposure has been completed at the K1.8 beam line of the J-PARC hadron facility in June 2017. The photographic development of all emulsion sheets has also been completed in February 2018. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics is comparable to that of E373 and so far 10 events of 3-vertices topology have been detected. A typical event of double Λ hypernucleus and a twin Λ hypernucleus are introduced. We plan to complete the main part of the emulsion scanning within a year

Comparison of

Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(K−, π0) 3ΛH reaction. In this contribution, we will demonstrate our capability to provide 3ΛH binding energy information by deriving the production cross section ratio, σ3ΛH/σ4ΛH. The production cross section data for 3ΛH and 4ΛH are already available as the pilot run of E73 experiment and data analysis is in progress

Summary of the

The possible existence of deeply-bound $\bar K$-nuclear bound states, kaonic nuclei, has been widely discussed as products of the strongly attractive $\bar K$N interaction in I = 0 channels. Investigations of those exotic states will provide us unique information of the $\bar K$N interaction below the threshold, which is still not fully understood so far. Recently, we observed the simplest kaonic nuclei, $\bar K$NN, having a much deeper binding energy than normal nuclei via inflight (K−, N) reactions at the J-PARC E15 experiment. For further studies, we have proposed a series of experimental programs for the systematic investigation of light kaonic nuclei, from $\bar K$N (Λ(1405)) to $\bar K$NNNN. We will measure the $\bar K$NNN (A = 3) system at the new experiment approved as J-PARC E80, as a first step toward a comprehensive study