Measuring Fusion with RIBs and Dependence of Quasifission on Neutron Richness
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1 Measuring Fusion with RIBs and Dependence of Quasifission on Neutron Richness Aditya Wakhle National Superconducting Cyclotron Laboratory Michigan State University, E. Lansing, MI A. Wakhle, 4/15/15, Slide 1
2 Fusion Measurements at ReA3 ReA3 experimental area EBIT Charge Breeder CFFD Chamber From Cyclotron, gas catcher Multi-purpose Beam Line A. Wakhle, 4/15/15, Slide 2
3 Coincidence Fission Fragment Detector CFFD A. Wakhle, 4/15/15, Slide 3
4 Coincidence Fission Fragment Detector CFFD A. Wakhle, 4/15/15, Slide 4
5 Mechanisms Hindering SHE Formation Zagrebaev and Greiner. Phys. Rev. C 78, (2008). A. Wakhle, 4/15/15, Slide 5
6 Mechanisms Hindering SHE Formation Zagrebaev and Greiner. Phys. Rev. C 78, (2008). A. Wakhle, 4/15/15, Slide 6
7 Mechanisms Hindering SHE Formation Following capture the system may equilibrate Quasifission hinders CN formation by several orders of magnitude. Zagrebaev and Greiner. Phys. Rev. C 78, (2008). A. Wakhle, 4/15/15, Slide 7
8 Mechanisms Hindering SHE Formation Following capture the system may equilibrate Quasifission hinders CN formation by several orders of magnitude. Complex nature of QF lead to large uncertainty in P CN Need to understand mechanisms affecting P CN for reactions induced by RIBs Zagrebaev and Greiner. Phys. Rev. C 78, (2008). A. Wakhle, 4/15/15, Slide 8
9 Neutron Rich SHE Z 238 U?? N A. Wakhle, 4/15/15, Slide 9
10 Neutron Rich SHE Z 238 U?? N ß 6 neutrons à A. Wakhle, 4/15/15, Slide 10
11 Neutron Rich SHE Z 238 U?? N ß 6 neutrons à How do σ cap, QF and P CN evolve with increasing N/Z? Loss of beam intensity with neutron-rich beams à Do P CN and σ cap increase or decrease? A. Wakhle, 4/15/15, Slide 11
12 N/Z Dependence of Quasifission Current work on the N/Z dependence of QF shows conflicting results. Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 12
13 N/Z Dependence of Quasifission Current work on the N/Z dependence of QF shows conflicting results. 124 Sn+ 96 Zr 124 Sn+ 90 Zr 132 Sn+ 96 Zr 124 Sn+ 96 Zr Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 13
14 N/Z Dependence of Quasifission Current work on the N/Z dependence of QF shows conflicting results. 124 Sn+ 96 Zr 124 Sn+ 90 Zr 132 Sn+ 96 Zr 124 Sn+ 96 Zr Increasing neutron richness Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 14
15 N/Z Dependence of Quasifission Current work on the N/Z dependence of QF shows conflicting results. 124 Sn+ 96 Zr 124 Sn+ 90 Zr Increasing QF 132 Sn+ 96 Zr 124 Sn+ 96 Zr Increasing neutron richness Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 15
16 Initial stable beam experiment at ANU Measure competition between QF and FF. Vary target and projectile N/Z. Use Mass Angle Distributions (MADs) as probe. A. Wakhle, 4/15/15, Slide 16
17 Initial stable beam experiment at ANU Measure competition between QF and FF. Vary target and projectile N/Z. Use Mass Angle Distributions (MADs) as probe. A. Wakhle, 4/15/15, Slide 17
18 Mass-Angle Distributions Extract N/Z dependence of QF with minimal theoretical input Use mass-angle distributions as a sensitive probe of QF. A. Wakhle, 4/15/15, Slide 18
19 Cr + W Experiment E cm /V B = Cr W Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 19
20 Cr + W Experiment E cm /V B = Cr W Cr W Cr W Cr W Cr W - Provide 10 neutron change ( 50- Cr W) - Constant E* and E/V B - Investigate effect of increasing N/Z. - Eliminate influence of Zp*Zt on QF. - Minimize other influences on QF: mass asymmetry, deformation, entrance channel magicity K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 20
21 Cr + W Experiment E cm /V B = UD Tandem + LINAC Booster Cr W Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 21
22 Cr + W Experiment E cm /V B = Cr W 14UD Tandem + LINAC Booster + CUBE MWPC Setup Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). Hinde et al. PRC 53, 1290 (1996). Hinde et al PRL 101, (2008). du Rietz et al. PRC 88, 0618 (2013). A. Wakhle, 4/15/15, Slide 22
23 Cr + W Experiment - Results E cm /V B = Cr W Extract experimental mass width for each reaction. Mass angle correlation à QF Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 23
24 Cr + W Experiment - Results E cm /V B = Cr W Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 24
25 Cr + W Experiment - Results E cm /V B = Cr W Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 25
26 Cr + W Experiment - TDHF Calculations E cm /V B = Cr W Cr W Cr W Cr W Cr W K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 26
27 Isolate Effect of Neutron Richness NSCL PAC39 Proposal 37 K Pb σ capture ~200mb, beam intensity 8000pps 47 K Pb σ capture ~190mb, beam intensity 32000pps Availability of 37 K and 47 K beams provides 10 neutron change in projectile. Common target ( 208 Pb) allows us to isolate N/Z without interference from binding energy, deformation, and alignment related effects A. Wakhle, 4/15/15, Slide 27
28 Isolate Effect of Neutron Richness NSCL PAC39 Proposal 37 K Pb σ capture ~200mb, beam intensity 8000pps 47 K Pb σ capture ~190mb, beam intensity 32000pps Availability of 37 K and 47 K beams provides 10 neutron change in projectile. Common target ( 208 Pb) allows us to isolate N/Z without interference from binding energy, deformation, and alignment related effects ReA3 and CFFD A. Wakhle, 4/15/15, Slide 28
29 Isolate Effect of Neutron Richness NSCL PAC39 Proposal 37 K Pb σ capture ~200mb, beam intensity 8000pps 47 K Pb σ capture ~190mb, beam intensity 32000pps Availability of 37 K and 47 K beams provides 10 neutron change in projectile. Common target ( 208 Pb) allows us to isolate N/Z without interference from binding energy, deformation, and alignment related effects ReA3 and CFFD A. Wakhle, 4/15/15, Slide 29
30 Summary Need conclusive model-independent evidence for decrease in QF flux with increasing neutron-richness. Promising results from ANU measurement Proposal submitted at NSCL-ReA3 to isolate neutron-richness. Opportunities to use CFFD for fusion measurement and investigate P CN and σ capture with n-rich and p-rich RIBs at ReA3. Flexibility of CFFD allows several different detector configurations. CFFD is portable à measurements at other facilities. Future: FRIB will provide intensities to continue heavy-ion fusion studies but open opportunities to look at ER cross sections. A. Wakhle, 4/15/15, Slide 30
31 Acknowledgments Zach Kohley Kalee Hammerton Krystin Stiefel Michael Metvia John Yurkon (Det. Lab) NSCL Faculty, Electronics, Design, Machine Shops Volker Oberacker Sait Umar John Greene (Tgt. Fabrication) David Hinde Nanda Dasgupta Cedric Simenel Elizabeth Williams and a lot of great grad. students. A. Wakhle, 4/15/15, Slide 31
32 A. Wakhle, 4/15/15, Slide 32
33 Mass-Angle Distributions M R Fusion-fission M R Quasifission A. Wakhle, 4/15/15, Slide 33
34 M R M R A. Wakhle, 4/15/15, Slide 34
35 Isospin Dependence Quasifission Increases as N/Z Increases Quasifission Decreases as N/Z Increases { { Adamian et al. Nuc. Phys. A (2000). Lesko et al. PRC (1986). Liang et al. PRC (R) (2012). Sahm et al. Nuc. Phys. A (1985). Swiatecki et al. Phys. Scr. 24, 113 (1981). Swiatecki et al. Nucl. Phys. A 376, 275 (1982). Wang et al. PRC 82, 0605 (2010). A. Wakhle, 4/15/15, Slide 35
36 (Backup Slide) N/Z Dependence of Quasifission N Deficient Tgt N Rich Decrease X CN Less Quasifission Decrease α More Quasifission Tgt Swiatecki Nuc. Phys. A 376, 275 (1982). Bjrnholm and Swiatecki Nuc. Phys. A 391, 471 (1982). Lin et al. PRC 85, (2012). Chizhov et al. PRC 67, (2003). Back et al. PRC 32, 195 (1985). Berriman et al. Nature 413, 144 (2001). Adamian et al. Nuc. Phys. A 678, 24 (2000). Adamian et al. PRC 68, (2003). Antonenko et al. PRC 51, 2635 (1995). Antonenko et al. PLB 319, 425 (1993). Blocki et al. Nuc. Phys. A 459, 145 (1986). Hinde et al. PRL 89, (2002). A. Wakhle, 4/15/15, Slide 36
37 Previous Work: Isospin Dependence 90, 92, 94, 96 Zr Sn Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 37
38 Effective Fissility Liang et al. PRC 85, (2012). A. Wakhle, 4/15/15, Slide 38
39 Measured Mass Angle Distributions K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 39
40 Mass Widths (N/Z) CN : Calculation for Pure Fusion-Fission Gaussian fit to data K. Hammerton et al., submitted (2015). A. Wakhle, 4/15/15, Slide 40
41 Detector Positions: CFFD and CUBE Target A. Wakhle, 4/15/15, Slide 41
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