Deuteron–deuteron scattering above four-nucleon breakup threshold

Abstract

Deuteron-deuteron elastic scattering and transfer reactions in the energy regime above four-nucleon breakup threshold are described by solving exact four-particle equations for transition operators. Several realistic nuclear interaction models are used, including the one with effective many-nucleon forces generated by the explicit -isobar excitation; the Coulomb force between protons is taken into account as well. Differential cross sections, deuteron analyzing powers, outgoing nucleon polarization, and deuteronto-neutron polarization transfer coefficients are calculated at 10 MeV deuteron energy. Overall good agreement with the experimental data is found. The importance of breakup channels is demonstrated.

Tetraneutron: Rigorous continuum calculation

“…[2][3][4] has been applied successfully to other four-nucleon scattering processes, in contrast to FY equations [7]. However, the only method that so far provided reliable results for all fournucleon reactions above the complete breakup threshold, i.e., for elastic, charge-exchange, transfer, and breakup processes in nucleon-trinucleon and deuteron-deuteron collisions, is the momentum-space transition operator method [8,9]. Furthermore, it provided the most accurate results in the field of the universal four-fermion [10] and four-boson [11] physics, including the properties of resonant (unstable) four-particle states.…”

Four-body calculation of H2(d,p)H3 and Deltuva1, Fonseca2 2017Phys. Rev. CSelf Cite

“…The former set is already analyzed in our earlier work [14]. Despite the very complex angular dependence of deuteron-to-neutron polarization transfer coefficients having up to six local extrema, a good agreement between theory and experiment and little sensitivity to the N N force model are found.…”

“…In the last 10 years significant progress has taken place in exact ab initio calculations of two-cluster scattering in the four-nucleon system, both below [1][2][3][4][5][6][7][8][9] and above [10][11][12][13][14][15][16][17] the breakup threshold. In the case of multichannel reactions, i.e., processes with open rearrangements and/or breakup channels, the most advanced calculations were performed by solving the Alt, Grassberger, and Sandhas (AGS) equations [18,19] for the four-particle transition operators in the momentum-space framework.…”

Reactions in the four-nucleon system above breakup threshold

“…Further examples can be found in Refs. [16,[26][27][28]. We use several realistic interaction models, i.e., the charge-dependent Bonn potential (CD Bonn) [29], its coupled-channel extension CD Bonn + Δ [30], and the inside-nonlocal outside-Yukawa (INOY04) potential by Doleschall [6,31].…”