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

@article{57582,
   author = {Muzalevskii, Ivan and Bezbakh, Andrey and Nikolskii, E. Yu and Chudoba, Vratislav and Krupko, S. A. and Belogurov, S. G. and Biare, D. and Fomichev, A. S. and Gazeeva, E. M. and Gorshkov, A., V and Grigorenko, L., V and Kaminski, G. and Kiselev, O. and Kostyleva, D. A. and Kozlov, M. Yu and Mauyey, B. and Mukha, I. and Parfenova, Yu L. and Piatek, W. and Quynh, A. M. and Schetinin, V. N. and Serikov, A. and Sidorchuk, S. and Sharov, Pavel and Shulgina, N. B. and Slepnev, R. S. and Stepantsov, S., V and Swiercz, A. and Szymkiewicz, P. and TerandAkopian, G. M. and Wolski, R. and Zalewski, B. and Zhukov, M., V},
   article_number = {4},
   doi = {http://dx.doi.org/10.1103/PhysRevC.103.044313},
   keywords = {SUPERHEAVY HYDROGEN ISOTOPES;ACCULINNA-2;NEUTRON;NUCLEI;SEARCH;DECAY},
   language = {eng},
   issn = {2469-9985},
   journal = {Physical Review C},
   title = {Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction},
   url = {https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.044313},
   volume = {103},
   year = {2021}
}

TY  - JOUR
ID  - 57582
AU  - Muzalevskii, Ivan - Bezbakh, Andrey - Nikolskii, E. Yu - Chudoba, Vratislav - Krupko, S. A. - Belogurov, S. G. - Biare, D. - Fomichev, A. S. - Gazeeva, E. M. - Gorshkov, A., V - Grigorenko, L., V - Kaminski, G. - Kiselev, O. - Kostyleva, D. A. - Kozlov, M. Yu - Mauyey, B. - Mukha, I. - Parfenova, Yu L. - Piatek, W. - Quynh, A. M. - Schetinin, V. N. - Serikov, A. - Sidorchuk, S. - Sharov, Pavel - Shulgina, N. B. - Slepnev, R. S. - Stepantsov, S., V - Swiercz, A. - Szymkiewicz, P. - Ter-Akopian, G. M. - Wolski, R. - Zalewski, B. - Zhukov, M., V
PY  - 2021
TI  - Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction
JF  - Physical Review C
VL  - 103
IS  - 4
SP  - "044313-1"-"044313-15"
EP  - "044313-1"-"044313-15"
SN  - 24699985
KW  - SUPERHEAVY HYDROGEN ISOTOPES;ACCULINNA-2;NEUTRON;NUCLEI;SEARCH;DECAY
UR  - https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.044313
N2  - The extremely neutron-rich system H-7 was studied in the direct H-2(He-8, He-3) H-7 transfer reaction with a 26 A MeV secondary He-8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)]. The missing mass spectrum and center-of-mass angular distributions of H-7, as well as the momentum distribution of the H-3 fragment in the H-7 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 H-2(Be-10, He-3) Li-9 reaction. A solid experimental evidence is provided that two resonant states of H-7 are located in its spectrum at 2.2(5) and 5.5(3) MeV relative to the H-3 +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 H-7 spectrum. Based on the energy and angular distributions, obtained for the studied H-2(He-8, He-3) H-7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H-7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2(+) member of the H-7 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)]. Consequently, the two doublet members appeared in the spectrum of H-7 in the work mentioned above as a single broad 6.5-MeV peak.
ER  - 

MUZALEVSKII, Ivan, Andrey BEZBAKH, E. Yu NIKOLSKII, Vratislav CHUDOBA, S. A. KRUPKO, S. G. BELOGUROV, D. BIARE, A. S. FOMICHEV, E. M. GAZEEVA, A., V GORSHKOV, L., V GRIGORENKO, G. KAMINSKI, O. KISELEV, D. A. KOSTYLEVA, M. Yu KOZLOV, B. MAUYEY, I. MUKHA, Yu L. PARFENOVA, W. PIATEK, A. M. QUYNH, V. N. SCHETININ, A. SERIKOV, S. SIDORCHUK, Pavel SHAROV, N. B. SHULGINA, R. S. SLEPNEV, S., V STEPANTSOV, A. SWIERCZ, P. SZYMKIEWICZ, G. M. TER-AKOPIAN, R. WOLSKI, B. ZALEWSKI and M., V ZHUKOV. Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction. \textit{Physical Review C}. 2021, vol.~103, No~4, p.~''044313-1''-''044313-15'', 15 pp. ISSN~2469-9985. Available from: https://dx.doi.org/10.1103/PhysRevC.103.044313.