Information related on experimental proposal for J-PARC

General

We aim to perform experiments with the K1.8 beam line of the 50 GeV proton-synchrotron facility at J-PARC. The high intensity pion beams by the slow beam extraction will be used. Our subjects are a copious production of the neutron-rich hypernuclei by the double-charge exchange (DCX) reactions (E10) and a detail study on the non-mesonic weak decay in the A=4 hypernuclei (E22).

Proposal status

Proposal submitted

Proposal re-submitted

• P10-1: Production of Neutron-Rich Lambda-Hypernuclei with the Double Charge-Exchange Reaction ( PDF )
• P10-2: Exclusive Study on the Lambda N Interaction in A=4 Lambda-Hypernuclei ( PDF )
• PAC presentation ( P10-1 by A. Sakaguchi, P10-2 by S. Ajimura )

The P10-1 proposal got the stage-1 approval as E10, and the P10-2 proposal also got the stage-1 approval as E22

FIFC meeting in 18/May/07

• Report on technical issues for E10 experiment ( PDF )
• FIFC presentation ( PDF )
• QandA ( PDF )

The E10 proposal got the stage-2 approval.

Information

Beam line

• Basics of secondary beam line written by Noumi ( PDF partly in Japanese )

Spectrometer

• SksPlus
  • Original design by Takahashi ( PDF in Japanese )
  • Optional designs ( PDF )
• SPES-II specification ( PDF )

Reactions

• Single charge exchange cross section (all in CM)
  • p(π^-,K⁰)Λ ( total, differential )
  • p(K^-,π⁰)Λ ( total, differential )
• Double charge exchange cross section (all in CM)
  • p(π^-,K⁺)Σ^- ( total, differential )
  • p(K^-,π⁺)Σ^- ( total, differential )
• No charge exchange (NCX) cross section (all in CM)
  • n(K^-,π^-)Λ ( total, differential )
  • ⁴He(K^-,π^-)_Λ⁴He(0⁺) and ⁴He(π⁺,K⁺)_Λ⁴He(0⁺) cross section calculated by T.Harada ( PDF )
• Summary of NCX/DCX cross sections (all in LAB)

  Reactions	Elementary Cross Section	Hypernuclei Formation
  NCX: (K-,π-) @ 0.9GeV/c	4 mb/sr	0.2 mb/sr
  (π+,K+) @ 1.05GeV/c	0.5 mb/sr	8 μb/sr
  DCX: (K-,π+) @ 0.8GeV/c	1 mb/sr	n.a.
  (π-,K+) @ 1.2GeV/c	70 μb/sr	10 nb/sr

LOI related

• Precise measurement of the non-mesonic weak decay of A=4, 5 Lambda hypernuclei ( PDF )
• Neutron-rich Lambda hypernuclei by the double-charge exchange reaction ( PDF )
• High-resolution reaction spectroscopy of S=-1 hypernuclei ( PDF )
• New generation spectroscopy of hadron many-body systems with strangeness S = -2 and -1 ( PDF )