1. Population of tetraneutron continuum in reactions of $^{8}$He on deuterium
- Author
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Muzalevskii, I. A., Shulgina, N. B., Bezbakh, A. A., Chudoba, V., Krupko, S. A., Belogurov, S. G., Biare, D., Egorova, I. A., Fomichev, A. S., Gazeeva, E. M., Gorshkov, A. V., Grigorenko, L. V., Kaminski, G., Khirk, M., Kiselev, O., Kostyleva, D. A., Kozlov, M. Yu., Mauyey, B., Mukha, I., Nikolskii, E. Yu., Parfenova, Yu. L., Piatek, W., Quynh, A. M., Schetinin, V. N., Serikov, A., Sidorchuk, S. I., Sharov, P. G., Slepnev, R. S., Stepantsov, S. V., Swiercz, A., Szymkiewicz, P., Ter-Akopian, G. M., and Zalewski, B.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
Search for the population of the low-energy continuum of tetraneutron system was performed for reactions of the $^{8}$He beam on deuterium target. These studies are performed for the data [I.A. Muzalevskii et al., Phys. Rev. C 103, 044313 (2021)], previously used for the studies of $^{7}$H and $^{6}$H in the $^2\text{H}(^8\text{He},{^3\text{He}})^{7}$H and $^2\text{H}(^8\text{He},{^4\text{He}})^{6}$H reactions. Evidence for a hump in the $^4n$ continuum at $3.5 \pm 0.7$ and $3.2 \pm 0.8$ MeV, was observed in the $^2$H($^8$He,$^6$Li)$^4$n and $^2$H($^8$He,$^3$He)$^7$H$\rightarrow ^3$H+$^4$n reactions, respectively. The observed statistics is quite low (6 and up to 40 events) corresponding to very low cross sections of few microbarns or tens of microbarns. The background conditions for the $^2$H($^8$He,$^6$Li)$^4n$ reaction are shown to be good, favoring the physical nature of the observed events. The $^2$H($^8$He,$^3$He)$^7$H$\rightarrow ^3$H+$^4n$ process transforms to the $^2$H($^8$He,$^6$Li$^{\ast})^4n$ reaction in the limit of the highest $^7$H decay energies. The population of the low-energy region in the $^{4}$n spectrum is found to be perfectly correlated with the population of the lowest $^{6}$Li states in the $^{3}$He+$^{3}$H continuum. Theoretical calculations of $^{8}$He in a five-body $\alpha$+$4n$ and of $^{4}$n in a four-body hyperspherical models are presented. The $^{8}$He wave function is shown to contain strong specific correlations, which may give rise to very low-energy structures in tetraneutron continuum in extreme-peripheral reaction scenarios., Comment: 13 pages, 9 figures
- Published
- 2023