H 6 states studied in the H 2 (He 8, He 4) reaction and evidence of an extremely correlated character of the H 5 ground state
Journal article, 2022
The extremely neutron-rich system H6 was studied in the direct H2(He8,He4)H6 transfer reaction with a 26A MeV secondary He8 beam. The measured missing mass spectrum shows a broad bump at ≈4-8 MeV above the H3+3n decay threshold. This bump can be interpreted as a broad resonant state in H6 at 6.8(5) MeV. The population cross section of such a presumably p-wave state (or it may be few overlapping states) in the energy range from 4 to 8 MeV is dσ/dωc.m.≃190-80+40μb/sr in the angular range 5°<θc.m.<16°. The obtained missing mass spectrum is practically free of H6 events below 3.5 MeV (dσ/dωc.m. 5μb/sr in the same angular range). The steep rise of the H6 missing mass spectrum at ≈3 MeV allows us to derive the lower limit for the possible resonant-state energy in H6 to be 4.5(3) MeV. According to the paring energy estimates, such a 4.5(3) MeV resonance is a realistic candidate for the H6 ground state (g.s.). The obtained results confirm that the decay mechanism of the H7 g.s. (located at 2.2 MeV above the H3+4n threshold) is the "true"(or simultaneous) 4n emission. The resonance energy profiles and the momentum distributions of fragments of the sequential H6→H5(g.s.)+n→H3+3n decay were analyzed by the theoretically updated direct four-body-decay and sequential-emission mechanisms. The measured momentum distributions of the H3 fragments in the H6 rest frame indicate very strong "dineutron-type"correlations in the H5 ground state decay.
Author
E.Y. Nikolskii
National Research Centre "Kurchatov Institute"
Joint Institute for Nuclear Research (JINR)
I. A. Muzalevskii
Joint Institute for Nuclear Research (JINR)
Slezska univerzita v Opave
A.A. Bezbakh
Joint Institute for Nuclear Research (JINR)
Slezska univerzita v Opave
V. Chudoba
Slezska univerzita v Opave
Joint Institute for Nuclear Research (JINR)
S. A. Krupko
Joint Institute for Nuclear Research (JINR)
S. G. Belogurov
Joint Institute for Nuclear Research (JINR)
National Research Nuclear University
D. Biare
Joint Institute for Nuclear Research (JINR)
A. S. Fomichev
Joint Institute for Nuclear Research (JINR)
Dubna International University
E. M. Gazeeva
Joint Institute for Nuclear Research (JINR)
A. V. Gorshkov
Joint Institute for Nuclear Research (JINR)
L Grigorenko
National Research Centre "Kurchatov Institute"
National Research Nuclear University
Joint Institute for Nuclear Research (JINR)
G. Kaminski
University of Warsaw
Joint Institute for Nuclear Research (JINR)
M. Khirk
Moscow State University
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
Institute of Nuclear Physics, National Nuclear Center of the Republic of Kazakhstan
Joint Institute for Nuclear Research (JINR)
I. G. Mukha
Helmholtz
Y. L. Parfenova
Joint Institute for Nuclear Research (JINR)
W. Piatek
University of Warsaw
Joint Institute for Nuclear Research (JINR)
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
Slezska univerzita v Opave
Joint Institute for Nuclear Research (JINR)
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
AGH University of Science and Technology
Joint Institute for Nuclear Research (JINR)
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. 105 6 064605Subject Categories
Accelerator Physics and Instrumentation
Subatomic Physics
Atom and Molecular Physics and Optics
DOI
10.1103/PhysRevC.105.064605