Introduction

 Experiment E12-15-008 will measure 40ΛK and 48ΛK hypernuclei to investigate the isospin dependence of the ΛNN interaction at Jefferson Lab Hall A.

 Left figure shows a schematic of the experimental setup. An electron beam of Ee = 4.5 GeV will be incident on a target to produce Λ hypernuclei through the (e,e'K+) reaction. The scatterd electron and K+ with momenta of 3.0 and 1.2 GeV/c will be momentum-analyzed by two existing-magnetic spectrometers, HRS and HKS, respectively.

 We are now designing a new septum magnet (SEP) that leads to smaller-scattering angle coverages for both e' and K+. Particle detections at the small scattering angle are needed to increase a virtual photon flux and to cover a region with a larger differential-cross section of the (γ*,K+) reaction.

 A target system, that allows us to use isotopically enriched targets of 40Ca and 48Ca in a vacuum chamber, is also being designed. The targets need a cooling system becasue the heat due to an energy deposite of the high current electron beam (∼50 μA) cannot be removed by convection in the vacuum environment.

Proposal (Status: Approved)

→ Jefferson Lab's page

Collaboration Meeting

March 23-24, 2017


Personal Memos

Presentation files

Septum magnet (May 2017)

Simple MC simulation for nnΛ exp. (May 2017)

SEP-HRS Monte Carlo Simulation (Feb 2017)

Geant4 installation in TOHOKU farms (Jan 2017)


後神 利志
Toshiyuki Gogami, D. Sc.

宮城県仙台市青葉区荒巻字青葉6-3
理学合同B棟623号室
022-795-6452 (Ex. 6452)
gogami_at_lambda.phys.tohoku.ac.jp