Total reaction and neutronremoval cross sections measurement on

Total reaction and neutron-removal cross sections measurement on fragmentseparator COMBAS Issatayev Talgat

Introduction •

• Preliminary results of measurements of the total reaction cross sections σR for 6, 8 He, 6 -9 Li, 7, 9, 10, 11 Be, 10 -14 B nuclei at energy range (25 -45 )/A Me. V on 27 Al и 28 Si targets and n-removal cross section are presented. The secondary beams were produced by bombardment of the 22 Ne (40 A Me. V) primary beam on 9 Be (89 mg/cm 2) target and separated by COMBAS fragment separator. The secondary products were detected by a telescope consisting of five Si ΔE detectors 300, 500 μm and E – detector Cs. I/Tl

Secondary beam production

Experimental Set-up A picture of the set-up and schematic view of the detection system

Secondary beam identification Two-dimensional scatter plot ΔE 2 and ΔE 3 Yields versus energy loss measurement (ΔE) and the remain energy deposited in the Cs. I -detector Spectra of the 4 He beam profile obtained in current integral mode Two-dimensional scatter plot ΔE 2 and ΔEtotal

The experimental details Principle of transmission method Practical application of the transmission method: measurements (left) with and (right) without target are performed to eliminate the contribution from the reaction in the detector materials

Total reaction cross section measurements isotope Total reaction cross sections as a function of projectile mass number Total reaction cross section [MG], Energy (Me. V/A) [this work] E (Me. V/A)[*-MG] E (Me. V/A)[**Warner] 4 He 0. 85± 0. 255 1. 625± 0. 051 29. 00 33. 89* 6 He 2. 16± 0. 648 2. 29± 0. 13 23. 88 25. 12* 8 He 3. 2± 0. 96 3. 62± 0. 11 12. 41 19 -53** 6 Li 2. 26± 0. 678 2. 09± 0. 26 4. 40 32. 89* 7 Li 2. 81± 0. 843 2. 181± 0. 035 23. 52 40. 93* 8 Li 2. 23± 0. 669 2. 358± 0. 041 24. 60 35. 60* 9 Li 3. 18± 0. 954 2. 19± 0. 27 18. 55 24. 36* 7 Be 1. 37± 0. 411 1. 36± 0. 52 3. 65 42. 86* 9 Be 2. 49± 0. 747 2. 358± 0. 041 24. 11 35. 60* 10 Be 2. 63± 0. 789 2. 410± 0. 036 17. 74 35. 33* 11 Be 5. 11± 1. 533 2. 84± 0. 21 12. 72 28. 64* 10 B 2. 41± 0. 723 2. 42± 0. 24 20. 07 30. 84* 11 B 2. 452± 0. 735 2. 432± 0. 087 19. 66 45. 65* 12 B 2. 2± 0. 660 2. 519± 0. 053 30. 53 37. 86* 13 B 2. 74± 0. 822 2. 750± 0. 068 25. 78 31. 67* 14 B 5. 6± 1. 680 3. 38± 0. 50 25. 31 26. 70*

Neutron-removal from 6 He, 8 Li, 10 Be 1 -n removal from 8 Li 2 -n removal from 6 He. Spectrum of the total energy in the telescope Type (%) n-removal cross section 25. 12 2. 16 0. 7 32. 41 σ-1 n 35. 60 2. 23 0. 46 20. 63 35. 33 2. 63 0. 29 11. 02 10 Be, 2 -n removal from 10 Be Total reaction cross section σ-2 n 6 He, 8 Li, Energy (Me. V/nucleon) σ-2 n

Conclusions •

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