Collection device for Li-8 and B-8.

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Presentation transcript:

Collection device for Li-8 and B-8. Flerov Laboratory of Nuclear Reactions Joint Institute for Nuclear Research Dubna Université catholique de Louvain Centre de Recherches du Cyclotron Louvain-la-Neuve Collection device for Li-8 and B-8. Semen Mitrofanov Marc Loiselet Thierry Delbar Thomas Keutgen 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

7Li + D-> 8Li + p - Beam: Li-7, target: D - gas Main idea – “Beam cooling with ionisation losses” – C. Rubbia, A Ferrari, Y. Kadi and V. Vlachoudis in NIM A 568 (2006) 475–487 Inverse kinematics !!! 7Li + D-> 8Li + p - Beam: Li-7, target: D - gas 6Li + 3He -> 8B + n - Beam: Li-6, target: 3He - gas Li-8 : β- decay, antineutrino source B-8 : β+ decay, neutrino source * From Rubbia. Collection device task: To slow down , stop and extract Li-8 or B-8 produced in the gas target. Extraction of Li-8 is known, but B-8 was never extracted. Is it possible to extract B-8 ??? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Experiment setup Scheme: beam->target->collection device->diffusion + effusion-> detection 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Planning Step 1. Test of the detection system without collection device (Li-8). Step 2. Test of the collection device with Li-8. Step 3. Extraction of B-8 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step 1. Test of the detection system without collection device Scheme: beam -> target -> stopper -> 8Li detection 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step 1. Test of the detection system without collection device Scheme: beam->target->8Li detection 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Technical drawing…. 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

In the Igloo…. 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step 1. Test of the detection system without collection device. Li-8 decay curve. Our detection system is working properly ! 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step 2. Test of the collection device with Li-8. Scheme: beam->target->collection device->diffusion + effusion-> 8Li detection 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step 2. Test of the collection device with Li-8. Scheme: beam->target->collection device->diffusion + effusion-> 8Li detection 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

In the Igloo…. 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Gas target = gas cell + pressure windows Difficulties…. It is very difficult to keep a gas target close to the hot collector device (over 1500ºC) Gas target = gas cell + pressure windows Reliable Ta-foil (gas cell windows) are not available. Each foil had to be tested individually. In spite of these tests, the windows are not reliable !!! The temperature of the collection device has to be limited (up to 1500ºC). 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Li-8 extracted from the collection device Our collection device is working ! 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Beam: Li-6, target: 3He - gas Step3. Extraction of B-8 ? 6Li + 3He -> 8B + n Beam: Li-6, target: 3He - gas Boron… Cross-section is lower in 20 times… Is it possible to extract B-8 as an element like Li-8 was extracted ? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step3. Extraction of B-8 ? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step3. Extraction of B-8 ? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step3. Extraction of B-8 ? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Step3. Extraction of B-8 ? 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Conclusion for B-8 . We measured “0” extraction efficiency for B-8 but we will double check with Li-8 again to be sure there is no “bug”. If the extraction efficiency for B-8 is indeed “0” what is the difference between Li-8 and B-8 ? CHEMISTRY ?! Boron does not belong to the same column of the periodic table. There is a chemical reaction between Boron and collection device material which traps the element. 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Conclusion for B-8 . Other solution for the B-8 extraction ? slow down B8 in AlF3 to form 8BF3 – which is a volatile molecule . But for this, we will need another experimental setup… 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris

Thank You for Your attention Université catholique de Louvain Centre de Recherches du Cyclotron Louvain-la-Neuve Flerov Laboratory of Nuclear Reactions Joint Institute for Nuclear Research Dubna Thank You for Your attention Semen Mitrofanov Marc Loiselet Thierry Delbar Thomas Keutgen 4th EUROnu Annual Meeting June 12-15, 2012 APC, Paris