Abstract
We have collected the first physics data of an experimental search for the simplest kaonic nuclear bound state, “ K − pp”, by the 3He( K − n) reaction at J-PARC. We confirmed that our spectrometer system works as designed and observed clear peak structure composed of the quasi-elastic K − “ n ” → K − n and the charge-exchange K − “ p ” → ¯ K 0 n reactions in the forward neutron spectrum.
Highlights
Recent theoretical studies show that an anti-kaon can be bound in nuclei to form so-called kaonic nuclei as a result of strongly attractive K N interaction in I = 0 channels [1]
We are carrying out an experimental search for the K− pp bound state at J-PARC (J-PARC E15 [5])
We describe our spectrometer system, its performance and a very preliminary result of the forward neutron spectrum obtained in our first physics data taking
Summary
Recent theoretical studies show that an anti-kaon can be bound in nuclei to form so-called kaonic nuclei as a result of strongly attractive K N interaction in I = 0 channels [1]. Among such a new form of nuclear matter, “K− pp" [2] is attracting great interest as the simplest one. By using a liquid 3He target and a large acceptance detector surrounding it, we can detect decay particles from “K− pp" to fully reconstruct the reaction kinematics. About 1% statistics of the full proposal was collected in this period with an integrated beam power of 15 kW × week, which corresponds to 5 ×109 kaons on the helium-3 target
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