Commonlyused detectors for Sks Minus and Sks Plus

Commonly-used detectors for Sks. Minus and Sks. Plus

Specification of Sks. Minus and Sks. Plus Sks. Minus (K-, p-) @ p. K = 1. 5 Ge. V/c Pp = 1. 4 Ge. V/c Bound region : pp ~ 1. 4 Ge. V/c QF region : pp < 1. 4 Ge. V/c g-ray spectroscopy ⇒ Bound region Sks. Plus (K-, K+) @ p. K- = 1. 8 Ge. V/c p. K+ = 1. 35 Ge. V/c Bound region : p. K~ 1. 35 Ge. V/c QF region : p. K < 1. 1 -1. 35 Ge. V/c X production study ⇒ Both bound and QF region Requirements Ø Ø Ø Momentum resolution ~2 Me. V/c Ø Acceptance is as large as possible Ø Momentum region: 1. 1~1. 5 Ge. V/c Large acceptance >100 msr Angular coverage ~20 degree Momentum resolution < 4 Me. V/c Momentum region: 1. 0~1. 7 Ge. V/c

SDC 3&4をDC 3&4として使用 Sks. Minus Sks. Plus (Track : Central momentum 1. 0 -1. 9 Ge. V/c)

Simulation Results by T. Takahashi Sks. Plus acceptance Momentum resolution アクセプタンスは 40 msrに増加 Ø 1. 2 Ge. V/c以下にも欲しい Ø High momentumのprotonをトリガーに入れたくな いので 1. 5 Ge. V/c以上は切りたい

Modification for SDC 3&4 Sks. Minus Sks. Plusに合わせるため、Sks. Minusの方で後方検出器の角度と位置を調節

Sks. Minus acceptance after little modification 後方検出器の変更でもSks. Minusで問題なし

Sks. Plus acceptance after little modification Sks. Plus acceptance After Before アクセプタンスは増加 1. 1 -1. 45 Ge. V/cの領域をカバー出来ている 但し、high momentum側がアクセプタンスに入ってくる

Sks. Plus acceptance after little modification Sks. Plus acceptance qsct. <10° After Before アクセプタンスは増加 1. 1 -1. 45 Ge. V/cの領域をカバー出来ている 但し、high momentum側がアクセプタンスに入ってくる

Sks. Plus momentum resolution Ø 1. 8 Me. V/c(FWHM) @ 1. 35 Ge. V/c ⇔ 2. 1 Me. V/c(FWHM) for previous Sks. Plus ∵ X方向のwireが増えた分、運動量 分解能は向上 1. 9 Me. V/c(FWHM) @ 1. 35 Ge. V/c X 2. 7 T Map ○ : Previous Sks. Plus × : Sks. Plus Ø Factor 2倍で運動量分解能は 4. 0 Me. V/c近くになる

(K-, K+) kinematical region @1. 8 Ge. V/c up to 20 degree (w/o Fermi motion) こんな雰囲気です p(K-, K+)X 12 C(K-, K+)12 XBe g. s : -14 Me. V

1. 1 -1. 6 Ge. V/c up to 30 degree こんな雰囲気です 1. 1 Ge. V/c 1. 2 Ge. V/c 1. 3 Ge. V/c 1. 4 Ge. V/c 1. 5 Ge. V/c 1. 6 Ge. V/c