calculations for 56 ni transfer cross sections
DESCRIPTION
Calculations for 56 Ni transfer cross sections . ( p,d ) Zero-range and finite-range options give similar results Codes mostly consistent with increasing beam energy Inconsistency with different potentials (d, 3 He) - PowerPoint PPT PresentationTRANSCRIPT
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Calculations for 56Ni transfer cross sections
(p,d) Zero-range and finite-range options give similar results Codes mostly consistent with increasing beam energy Inconsistency with different potentials
(d,3He) Discontinuity with increasing energy in TWOFNR calculations
with Daehnick deuteron potential [for (d,3He) reaction only]
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Calculation details
• Same set of options for FRESCO and TWOFNR calcs– “brush” front end produces input file for both calculations
• did NOT include non-locality– not an option for FRESCO
• tried both ZR and FR (LEA) options– Near peak, very little difference – remaining calcs use FR (LEA)
Solid = TWOFNRDashed = FRESCO
56Ni(p,d)55NiChapel Hill 89 optical potential for pJS Adiabatic + CH89 potential for d
37 MeV/A
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56Ni(p,d) 55Ni
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15 Nov
56Ni(p,d) cross sections – comparing d potentials Chapel Hill 89 optical potential for pComparing deutron potentials (JS+CH89 and Daehnick)
Each color is a different beam energy (MeV/u)Solid = JS+CH89 (adiabatic)Dashed = Daehnick
Shape and magnitude of cross sections are different
With Daehnick (DWBA):- peak mag ~2x larger- flattened shape- shifted peaks at high E
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15 Nov
56Ni(p,d) cross sections – increasing beam energyChapel Hill 89 optical potential for pJohnson-Soper Adiabatic potential + CH89 for d (ADWA)
Each color is a different beam energy (MeV/u)Solid = TWOFNRDashed = FRESCO
Little difference at peak with adiabatic pot.
Differences at: • larger angles • higher energy
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15 Nov
56Ni(p,d) cross sections – different deuteron potentialChapel Hill 89 optical potential for pDaehnick Global optical potential for d (DWBA)
Each color is a different beam energy (MeV/u)Solid = TWOFNRDashed = FRESCO
Excellent agreement throughout the energy range using Daehnick deuteron potential
Shape and magnitude of cross section is much different than when using adiabatic potential
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56Ni(d,3He)55Co
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15 Nov
56Ni(d,3He) cross sections – increasing energy for (d,3He)Daehnick Global optical potential for dBechetti-Greenlees optical potential for 3He
Each color is a different beam energy (MeV/u)Solid = TWOFNRDashed = FRESCO
Little difference at low E (red, black, green)
Enormous differences above ~60 MeV/u
Related to Daehnick discontinuity ? [see later slides]
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23 Nov
56Ni(d,3He) cross sections – different deuteron potential Perey-Perey optical potential for dBechetti-Greenlees optical potential for 3He
Each color is a different beam energy (MeV/u)Solid = TWOFNRDashed = FRESCO
Excellent agreement throughout the energy range with Perey-Perey deuteron potential
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56Ni(d,3He)55CoDaehnick discontinuity
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56Ni(d,3He) cross sections – Daehnick discontinuity Daehnick Global optical potential for dBechetti-Greenlees optical potential for 3He 17 Nov
TWOFNR Smooth change in cross
section with energy E<75 and E>76,
Discontinuity at E~75.85 MeV
Thick black lines are 60, 70, 80 MeV/uThin lines are 1 MeV/u steps
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56Ni(d,3He) cross sections – no Daehnick discontinuity Daehnick Global optical potential for dBechetti-Greenlees optical potential for 3He 17 Nov
FRESCOSmooth change in cross
section with energy over entire range
Thick black lines are 60, 70, 80 MeV/uThin lines are 1 MeV/u steps
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56Ni(d,3He) – local, zero-range, BG for 3He23 Jan
Daehnick for deuteron
Perey-Perey for deuteron
brush+twofnr10 brush12+twofnr11
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56Ni(d,3He) – local, zero-range, BG for 3He23 Jan
Daehnick for deuteron – still has discontinuity in twofnr (dotted)
brush12+twofnr11