Data on Neutron–Neutron Scattering Length from the Reaction $$\boldsymbol{n+^{2}\textrm{H}\to n+n+p}$$ at $$\boldsymbol{E_{n}=60}$$ MeV

Konobeevski, E. S.; Afonin, A. A.; Zuyev, S. V.; Kasparov, A. A.; Mitcuk, V. V.; Mordovskoy, M. V.; Potashev, S. I.

doi:10.1134/s1063778820040146

Cited by 2 publications

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“…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.…”

Section: Discussionmentioning

confidence: 81%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

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confidence: 99%

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

et al. 2022

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A kinematically complete experiment devoted to studying the $$nd$$-breakup reaction at energies of 8 and 11 MeV via detecting all three secondary particles was performed. The $${}^{1}S_{0}$$ neutron–neutron ($$nn$$) scattering-length values of $$a_{nn}={-}19.8\pm 0.4$$ and $${-}19.0\pm 0.5$$ fm at, respectively, $$E_{n}=8$$ and $$11$$ MeV were obtained from a comparison of the experimental dependence of the yield of the $$nd$$-breakup reaction on the relative energy of the $$nn$$ pair with the results of a simulation. An analysis of the values obtained for the $$nn$$ scattering length, together with data from other experiments, confirms the hypothesis that three-nucleon forces affect the parameters of $$nn$$ interaction that are extracted from reactions involving few-nucleon systems and gives a new asymptotic $$nn$$ scattering length, $$a_{nn}={-}16.1\pm 0.1$$ fm.

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