Search for the tetraneutron via the reaction

π−−He4Inelastic and Capture Reactions Leading to Excited and Multineutron Final

“…15,16 (In this same experiment detection of the reaction T-7 Li-> 3 H 4 H, 15 with T=l or T=2 for the W, was also reported. )…”

Is the tetraneutron a bound dineutron–dineutron molecule?

“…[2][3][4][5][6][7][8][9]). The experimental search at that time [10][11][12][13], including the experiments on double pion charge exchange reactions with 4 He [14,15], gave negative results. The general conclusion, based on experiment and theory, was that the tetraneutron cannot be bound.…”

Tetraneutron in the Chiral Quark Model

“…In the break-up products of the neutron-rich nuclei 14 Be, the fragmentation channel 10 Be+ 4 𝑛 was observed and the existence of tetraneutron state was claimed. [10] However, these results were not confirmed in the reaction 7 Li( 7 Li, 10 C) 4 𝑛. [11] Some researchers also pointed out that the analysis of Marques's experiment was flawed.…”