Determination of Energy of n n-Singlet Virtual State in $$\varvec{d+{{}^{2}}}\hbox {H}\varvec{\rightarrow p+p+n+n}$$ d + 2

Abstract

Determination of energy of nn-singlet virtual state in d+ 2 H  p+ p +n+n reactionAbstract The nn final state interaction has been investigated in d+ 2 H(pp) S +(nn) S p+p+n+n reaction going through a formation and breakup of singlet diproton and dineutron in the intermediate state.In the kinematically complete experiment performed at Ed =15 MeV two proton and neutron were detected at angles close to those of emission of (pp) S and (nn) S systems. Simulation of the reaction showed that the shape of neutron energy (timing) spectrum depends on εnn − the energy of virtual 1 S0 state of nn-system. The most likely value εnn = 0.076 ± 0.006MeV was obtained by fitting procedure using the experimental data and simulations. This low value of εnn evidently indicates on effective enhancement of nn-interaction in the intermediate state of studied reaction.

Data on the Neutron–Neutron Scattering Length from the nd-Breakup Reaction at En = 8 MeV and En = 11 MeV

“…Figure 5a shows data on the nn scattering length that were obtained in the present study and in other studies devoted to the nd-and dd-breakup reactions [2][3][4][5][6][7][8][9][10]. In [11], it was assumed that substantial discrepancies between experimental results from different studies may be explained by the effect of threenucleon (3N ) forces, which depend on the velocity at which the nn pair and the charged fragment fly apart.…”

“…Among them, the nd-and ddbreakup reactions are used most frequently to determine the nn scattering length. However, the data obtained on the nn scattering length in such reactions at different laboratories {TUNL [2,3], BONN [4,5], TUNL-BONN [6,7], and Institute for Nuclear Research (INR, Russian Academy of Sciences) [8][9][10]} after 1998 differ significantly.…”

“…The solid lines represent the approximations of the experimental points by the dependence in (4) at a = −16.1 ± 0.1 fm. The points stand for (diamonds) TUNL data from[2,3], (triangles) BONN data from[4,5], (squares) TUNL-BONN data from[6,7], (open circles) data obtained at INR[8][9][10], and (closed circles) our present data.…”

Prevalence of resistance mutations associated with integrase inhibitors in therapy-naive HIV-positive patients in Baoding, Hebei province, China

“…In contrast to the truly bound state which behaves as a real particle, the virtual state is usually called the anti-bound state since its wave function is not localized [109]. But the virtual state can indeed induce observable effects, such as in the nuclear reactions [110,111] and the experimental lineshapes [112,113], etc. One can also find a new method to probe the virtual state pole using improved complex scaling method in Ref.…”