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*Approved for 9 days beam time (experiment R390n)

*. *Approved for 9 days beam time (experiment R390n). Motivation. 1. 7 Li( 7 Li, 8 B) 6 H E ~ 2.7 MeV (Kurchatov Inst.). 2. 9 Be( 11 B, 14 O) 6 H E ~ 2.6 MeV (Dubna, FLNR). D.V. Aleksandrov et al., Yad. Fiz. 39, (1984) 513. A.V. Belozyorov et al., Nucl. Phys. A460, (1986) 352. 7 H.

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*Approved for 9 days beam time (experiment R390n)

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  1. * *Approved for 9 days beam time (experiment R390n)

  2. Motivation 1.7Li(7Li,8B)6H E ~ 2.7 MeV (Kurchatov Inst.) 2.9Be(11B,14O)6H E ~ 2.6 MeV (Dubna, FLNR) D.V. Aleksandrov et al., Yad. Fiz. 39, (1984) 513 A.V. Belozyorov et al., Nucl. Phys. A460, (1986) 352 7H M.S. Golovkov et al., Phys. Lett. B588 (2004) 163 First experimental evidence for existence of 7H! p(8He,pp)7H reaction (RIKEN) A.A. Korsheninnikov et al., Phys.Rev.Lett. 90, (2003) 082501 6H 4n Announcement of observationbound 4n (!!??)(GANIL) 14Be + 12C 10Be + 4n F.M. Margues et al., Phys. Rev. C65, (2002) 044006

  3. E (MeV) 7 H H-target - empty-target 70 60 50 40 30 20 counts/1.5 MeV 3 10 2 1 0 -10 -20 -30 -40 -30 -20 -10 0 10 20 30

  4. 8 3 7 d ( H e , H e ) H RIKEN dE Beam Drift chamber Telescope detectors scintillators Hodoscope 3 H e 3 H 8 H e n Target D 2 Dipole magnet MWPCs Neutron walls E x p e r i m e n t a l s e t u p

  5. Reduction factor = 0.09 LDSD = 12 cm Contributions to 7H resolution, MeV TOF 0.064 MWPC 0.200 Target 0.880 DSD 0.249 E_resol 0.313 ----------------------------- Total 0.952 Total(MS+S) 1.14 40 x 5 days = 200 events

  6. Kinematics and energy losses of recoil particles 100.0 3 0 E l o s s _ 0 * 3 E l o s s _ 2 0 * E( He) = 12.0 MeV 3 E( He) = 24.0 MeV 2 5 * 11 E ( Li) = 20 MeV 10.0 2 0 He), MeV * 1 5 11 E ( Li) = 0 MeV 3 E( 1 0 1.0 5 0 0.1 0 5 1 0 1 5 2 0 2 5 TAR WIN DE DSD SSD1 3 ( H e ) , d e g . q l a b 8He at 40 A MeV 12Be at 69.5 A MeV Q0 = -17.4 MeV 3 H e 1 1 L i Q0 = +3.15 MeV Q0 = -1.64 MeV Q0 = +3.67 MeV

  7. Energy Distributions of Recoil Particles in Telescope at 40 A MeV 8He d(8He,3He)7H d(8He,6Li)4n d(8He,4He)6H d(8He,6Li*(d4He))4n DE & DSD (MeV) DSD & SSD1 (MeV) 6Li 4He 3He 6Li 4He 3He d(6Li*) 4He(6Li*) d(6Li*) 4He(6Li*) SSD1 & SSD2 (MeV) SSD2 & SSD3 (MeV) 6Li 6Li 4He(6Li*) 4He(6Li*) d(6Li*) d(6Li*) Target D2: 4 mm, 1 atm, 30K, 6 mkm Fe E* = 0 MeV(30%), uniform {0-20} MeV(70%) DE-40 mkm DSD- 250 mkm SSD- 750 mkm LDSD = 12 cm Gains for energy channels: DE ≤ 10 MeV DSD ≤ 45 MeV SSD ≤ 90 MeV

  8. E(3He), MeV 20 30 40 E*(6H), MeV Estimation of Background How to reduce background? √ Install MWPC’s (PPAC’s) in vacuum... √ Target window…(thickness, material) (+ Coincidences with tritons and neutrons)

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