Resonant states in H 7: Experimental studies of the H 2 (He 8, He 3) reaction
Journal article, 2021

The extremely neutron-rich system H7 was studied in the direct H2(He8,He3)H7 transfer reaction with a 26 AMeV secondary He8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. The missing mass spectrum and center-of-mass angular distributions of H7, as well as the momentum distribution of the H3 fragment in the H7 frame, were constructed. In addition, we carried out another experiment with the same beam but a modified setup, which was cross-checked by the study of the H2(Be10,He3)Li9 reaction. A solid experimental evidence is provided that two resonant states of H7 are located in its spectrum at 2.2(5) and 5.5(3)MeV relative to the H3+4n decay threshold. Also, there are indications that the resonant states at 7.5(3) and 11.0(3)MeV are present in the measured H7 spectrum. Based on the energy and angular distributions, obtained for the studied H2(He8,He3)H7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2+ member of the H7 excitation 5/2+-3/2+ doublet, built on the 2+ configuration of valence neutrons. The supposed 7.5-MeV state can be another member of this doublet, which could not be resolved in Bezbakh et al. [Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. Consequently, the two doublet members appeared in the spectrum of H7 in the work mentioned above as a single broad 6.5-MeV peak.

Author

I. A. Muzalevskii

Joint Institute for Nuclear Research (JINR)

Slezska univerzita v Opave

A.A. Bezbakh

Slezska univerzita v Opave

Joint Institute for Nuclear Research (JINR)

E.Y. Nikolskii

National Research Centre "Kurchatov Institute"

Joint Institute for Nuclear Research (JINR)

V. Chudoba

Slezska univerzita v Opave

Joint Institute for Nuclear Research (JINR)

S. A. Krupko

Joint Institute for Nuclear Research (JINR)

S. G. Belogurov

National Research Nuclear University

Joint Institute for Nuclear Research (JINR)

D. Biare

Joint Institute for Nuclear Research (JINR)

A. S. Fomichev

Dubna International University

Joint Institute for Nuclear Research (JINR)

E. M. Gazeeva

Joint Institute for Nuclear Research (JINR)

A. V. Gorshkov

Joint Institute for Nuclear Research (JINR)

L Grigorenko

National Research Nuclear University

Joint Institute for Nuclear Research (JINR)

National Research Centre "Kurchatov Institute"

G. Kaminski

University of Warsaw

Joint Institute for Nuclear Research (JINR)

O. Kiselev

Helmholtz

D. Kostyleva

Helmholtz

Justus Liebig University Giessen

M. Yu Kozlov

Joint Institute for Nuclear Research (JINR)

B. Mauyey

L.N. Gumilyov Eurasian National University

Joint Institute for Nuclear Research (JINR)

I. G. Mukha

Helmholtz

Y. L. Parfenova

Joint Institute for Nuclear Research (JINR)

W. Piatek

Joint Institute for Nuclear Research (JINR)

University of Warsaw

A. M. Quynh

Joint Institute for Nuclear Research (JINR)

Institute for Nuclear Research Vietnam

V. N. Schetinin

Joint Institute for Nuclear Research (JINR)

A. Serikov

Joint Institute for Nuclear Research (JINR)

S. I. Sidorchuk

Joint Institute for Nuclear Research (JINR)

P.G. Sharov

Joint Institute for Nuclear Research (JINR)

Slezska univerzita v Opave

N. B. Shulgina

National Research Centre "Kurchatov Institute"

Joint Institute for Nuclear Research (JINR)

R. S. Slepnev

Joint Institute for Nuclear Research (JINR)

S. V. Stepantsov

Joint Institute for Nuclear Research (JINR)

A. Swiercz

Joint Institute for Nuclear Research (JINR)

AGH University of Science and Technology

P. Szymkiewicz

Joint Institute for Nuclear Research (JINR)

AGH University of Science and Technology

G. M. Ter-Akopian

Joint Institute for Nuclear Research (JINR)

Dubna International University

R. Wolski

Joint Institute for Nuclear Research (JINR)

Polish Academy of Sciences

B. Zalewski

Joint Institute for Nuclear Research (JINR)

University of Warsaw

Mikhail Zhukov

Chalmers, Physics

Physical Review C

24699985 (ISSN) 24699993 (eISSN)

Vol. 103 4 044313

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Atom and Molecular Physics and Optics

DOI

10.1103/PhysRevC.103.044313

More information

Latest update

5/20/2021