Observation of a positive-parity wave in the low-energy spectrum of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>He</mi><mprescripts></mprescripts><none></none><mn>7</mn></mmultiscripts></math>

M. S. Golovkov; A. A. Bezbakh; A. S. Denikin; R. Wolski; S. G. Belogurov; D. Biare; V. Chudoba; E. M. Gazeeva; A. V. Gorshkov; G. Kaminski; B. R. Khamidullin; S. A. Krupko; B. Mauyey; I. A. Muzalevskii; W. Piatek; A. M. Quynh; R. S. Slepnev; A. Swiercz; P. Szymkiewicz; B. Zalewski

doi:10.1103/PhysRevC.109.L061602

Letter

Observation of a positive-parity wave in the low-energy spectrum of ${}^{7}{He}$

M. S. Golovkov ¹, A. A. Bezbakh ^1,2,*, A. S. Denikin ^1,2, R. Wolski ¹, S. G. Belogurov^1,3, D. Biare¹, V. Chudoba^1,4, E. M. Gazeeva¹, A. V. Gorshkov¹ et al.

G. Kaminski ^1,5, B. R. Khamidullin ^1,6, S. A. Krupko¹, B. Mauyey^1,7, I. A. Muzalevskii ^1,4, W. Piatek^1,5, A. M. Quynh ^1,8, R. S. Slepnev¹, A. Swiercz¹, P. Szymkiewicz¹, and B. Zalewski ^1,5

¹Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia
²Department of Nuclear Physics, Dubna State University, 141982 Dubna, Russia
³Institute of Nuclear Physics and Engineering, National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
⁴Institute of Physics, Silesian University in Opava, 74601 Opava, Czech Republic
⁵Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland
⁶Department of Nuclear-Physical Materials Science, Kazan Federal University, 420111 Kazan, Russia
⁷Faculty of Physics and Technology, L. N. Gumilyov Eurasian National University, 010008 Astana, Kazakhstan
⁸Nuclear Research Institute, 670000 Dalat, Vietnam

^*Contact author: bezbakh@jinr.ru

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Phys. Rev. C 109, L061602 – Published 14 June, 2024

DOI: https://doi.org/10.1103/PhysRevC.109.L061602

Abstract

The ${}^{7}{He}$ nucleus was studied by the $(d, p)$ reaction at $29 A MeV$ beam energy. The ${}^{7}{He}$ spectrum was measured up to 8 MeV above the ${}^{6}{He} + n$ threshold. The forward-backward asymmetry in the neutron emission from unbound states of ${}^{7}{He}$ has been found. That implies the presence of a positive parity partial wave in the ${}^{7}{He}$ spectrum.

Physical Review C

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Observation of a positive-parity wave in the low-energy spectrum of ${}^{7}{He}$

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Observation of a positive-parity wave in the low-energy spectrum of He7

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Observation of a positive-parity wave in the low-energy spectrum of ${}^{7}{He}$