Abstract
The J-PARC E15 experiment aims to search for the simplest kaonic nuclear bound state, K − pp , by the in-flight 3 He( K − , n ) reaction. In May 2013, the first physics data were taken at the K1.8BR beam-line in the J-PARC hadron hall. In this report, results of the semi-inclusive 3 He( K − , n ) and the exclusive 3 He( K − ,Λ pn ) channels are discussed.
Highlights
The K N interaction has been shown to be strongly attractive by extensive measurements of the kaonic hydrogen atom [1] and low-energy K N scattering [2]
The experimental setup consists of three parts: a high precision beam line spectrometer, a cylindrical detector system (CDS) around the liquid 3He target system, and a forward neutron TOF counter (NC) located about 15 m downstream from the center of the target
After the 3He(K−, n) reaction, particles produced from the K−pp were detected by CDS and the generated forward neutron was detected by using the NC
Summary
The K N interaction has been shown to be strongly attractive by extensive measurements of the kaonic hydrogen atom [1] and low-energy K N scattering [2]. As a key to deepen the understanding of the strongly attractive I = 0K N interaction, existence of deeply-bound K -nuclear states has been widely discussed in the recent years. The simplest K -nuclear bound system, K−pp, has been theoretically supported. The E15 experiment aims to search for the simplest K -nuclear bound state [4], K−pp, by reconstructing the complete kinematics of the reaction channels to discriminate all background processes. An exclusive measurement is performed with the in-flight 3He(K−, n) reaction at pk = 1.0 GeV/c. This reaction permits performing a missing-mass study using the produced neutron, and invariant-mass spectroscopy via the decay chain K−pp → p → p −p, simultaneously
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