Nonlocal interactions in the $(d,p)$ surrogate method for $(n,\gamma )$ reactions

Journal Article · Thu Oct 25 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.044621· OSTI ID:1525886

Li, Weichuan ^[1]; Potel, Gregory ^[2]; Nunes, Filomena ^[3]

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1. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Rutgers Univ., New Brunswick, NJ (United States). Dept. of Physics and Astronomy
2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Dept. of Physics and Astronomy

Single-neutron transfer reactions populating states in the continuum are interesting both for structure and astrophysics. In their description often global optical potentials are used for the nucleon-target interactions, and these interactions are typically local. In our work, we study the effects of nonlocality in (d,p) reactions populating continuum states. This work is similar to that of [1] but now for transfer to the continuum. A theory for computing cross sections for inclusive processes A(d,p)X was explored in [2]. Therein, local optical potentials were used to describe the nucleon-target effective interaction. The goal of the present work is to extend the theory developed in [2] to investigate the effects of including nonlocality in the effective interaction on the relevant reaction observables. We implement the R--matrix method to solve the non--local equations both for the nucleon wavefunctions and the propagator. We then apply the method to systematically study the inclusive process of (d,p) on 16 O, 40 Ca, 48 Ca and 208 Pb at 10, 20 and 50 MeV. We compare the results obtained when non--local interactions are used with those obtained when local equivalent interactions are included. We find that nonlocality affects different pieces of the model in complex ways. Depending on the beam energy and the target, the non-elastic breakup can either increase or decrease. While the non-elastic transfer cross section for each final spin state can change considerably, the main prediction of the model [2], namely the shape of the spin distributions, remains largely unaltered by nonlocality.

• Research Organization: Michigan State Univ., East Lansing, MI (United States); Rutgers Univ., New Brunswick, NJ (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Science Foundation (NSF)
• Grant/Contract Number: FG52-08NA28552; NA0000979; PHY-1520929; SC0013617
• OSTI ID: 1525886
• Alternate ID(s): OSTI ID: 1479141; OSTI ID: 1606230
• Journal Information: Physical Review C, Vol. 98, Issue 4; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS