短寿命核分離加速実験@KEK-JAERI 素核研、物理第 4研究系、石山博恒 • Facility Plan • Research Subjects • R&D’s and Schedule
Research Subjects 1. 天体核物理 ★天体核反応率の直接測定 ★r過程原子核の質量測定 ⇒宇宙での元素合成の実験的 解明 3. 物質科学 ★RNBの打ち込みによる材料 研究（拡散、電気磁気物性、 機械的性質） ⇒新材料の探索 2. 中重中性子過剰核の原子核物 4. 超アクチノイド元素の核化学 理 と原子核物理 ★クーロン励起、レーザーによる核 ★超アクチノイド元素の化学的 分光 性質の研究 ⇒安定核領域から離れた原子核 ★超重元素探索とその構造 の各構造、核反応機構
Facility Proposal 1999 - 2000: All the RNB instruments were moved to Tsukuba (no-primary beam accelerator) To rapid resume “Low-Energy RNB Science” including the nuclear physics, nuclear chemistry, nuclear astrophysics, material science, etc. It would be too late to start E-arena in JHF, whose construction will take at least 6 -7 years!! KEK-JAERI Joint RNB Facility • 5 -9 Me. V/u RNB will be available with using the existing S. C. Linac • Neutron-rich medium- and heavy-RNB can be supplied by the help of p-induced U-fission reaction. • Intense stable nuclear beam is also available independent from Tandem • Low Energy RNB center under the collaboration with KEK and JAERI
Time Schedule 2000 2001 2002 2003 2004 2005 KEK Charge Breeder (< 1 Me. V/u) Beam line Linac Measuring device Water Buncher JAERI IH-2、HEBT Exp. Room Utility house Electric power Water cooling system (5 -9 Me. V/u)
Charge Breeding(CB-) ECR 1+-I/S Accelerator condition: A/q≥ 30 for SCRFQ, ≥ 10 for IH 1, ≥ 7 for IH 2, SC-linac ISOL CB-ECRIS 1+-ion n+-ion to SCRFQ Particle production Electric potential (V) MINIMAFIOS (10 GHz) ECRIS 1+ ->n+ breeding efficiency VCB=2 A/q k. V DV(~10 e. V) smooth deceleration sudden deceleration DC-breeding/Bunching Breeding ECR confinement time: 520 ms for Rb 15+ Charge states equibration time: ~20 ms N. Chauvin et al. , Proc. 14 th ECRIS 99(‘ 99)151.
Layout of the Charge Breeding System at KEK Test Bench
短寿命核ビームによる固体 試料中の拡散系数測定 Charge-discharge mechanism in Li Battery Li 1 -x. Co. O 2(Anode) C 6 Lix(Cathode) Li+ 特徴 Li 1. 高速短寿命核ビーム ⇒表面状態によらない拡散条件 density T=t 0 t 1 t 2 position counts 3. Sensitivity 短寿命核の寿命と遅延荷電粒子の 阻止能 ⇒on-Line測定 （大きい拡散系数） 8 Li 2. 遅延荷電粒子エネルギー測定 放出エネルギースペクトルの時間変化 ⇒密度分布変化 s=(2 Dt)1/2 Ea
17 Explosive Nucleosynthesis 13 T 9 = 1 ( 109 K ) O F 18 F 19 F 20 F 21 F 22 21 14 O 15 O 16 O 17 O 18 O 19 O 20 O 19 F 23 O 22 N 13 N 14 N 15 N 16 N 17 N 18 N 11 C 12 C 13 C 14 C 15 C 16 C 17 C B 10 B 11 B 12 B 13 B 14 B 15 B Be 9 Be 11 10 C STABLE b-DECAY Proton 8 7 6 3 p He D 4 He Li 7 6 Li He Be 8 Li 10 9 8 Li He Be 12 Be 11 Li Supernova Explosion T 9=1 Neutron & Seed T 9=3 Alpha & Neutron T 9=10 Neutron & Proton T n (a, n) reaction Neutron Core r-process a-process F O
Direct-Exclusive Measurement of (α, n) reaction Detector n MSTPC & Neutron counter Veto counter (SSD) RN beam E=1~2 Me. V/u I=103～ 105 pps MCP Start counter (PPAC) MSTPC He gas Energy region T 9～ 1 Ecm～ 0. 5 Me. V Neutron counter
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