Evidence for the First Excited State of ^{7}H

A A Bezbakh; V Chudoba; S A Krupko; S G Belogurov; D Biare; A S Fomichev; E M Gazeeva; A V Gorshkov; L V Grigorenko; G Kaminski; O A Kiselev; D A Kostyleva; M Yu Kozlov; B Mauyey; I Mukha; I A Muzalevskii; E Yu Nikolskii; Yu L Parfenova; W Piatek; A M Quynh; V N Schetinin; A Serikov; S I Sidorchuk; P G Sharov; R S Slepnev; S V Stepantsov; A Swiercz; P Szymkiewicz; G M Ter-Akopian; R Wolski; B Zalewski; M V Zhukov

doi:10.1103/PhysRevLett.124.022502

Evidence for the First Excited State of ^{7}H

Phys Rev Lett. 2020 Jan 17;124(2):022502. doi: 10.1103/PhysRevLett.124.022502.

Authors

A A Bezbakh^{1

2}, V Chudoba^{1

2}, S A Krupko^{1

3}, S G Belogurov^{1

4}, D Biare¹, A S Fomichev^{1

5}, E M Gazeeva¹, A V Gorshkov¹, L V Grigorenko^{1

4

6}, G Kaminski^{1

7}, O A Kiselev⁸, D A Kostyleva^{8

9}, M Yu Kozlov¹⁰, B Mauyey^{1

11}, I Mukha⁸, I A Muzalevskii^{1

2}, E Yu Nikolskii^{1

6}, Yu L Parfenova¹, W Piatek^{1

7}, A M Quynh^{1

12}, V N Schetinin¹⁰, A Serikov¹, S I Sidorchuk¹, P G Sharov^{1

2}, R S Slepnev¹, S V Stepantsov¹, A Swiercz^{1

13}, P Szymkiewicz^{1

13}, G M Ter-Akopian^{1

5}, R Wolski^{1

14}, B Zalewski^{1

7}, M V Zhukov¹⁵

Affiliations

¹ Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia.
² Institute of Physics, Silesian University in Opava, 74601 Opava, Czech Republic.
³ SSC RF ITEP of NRC "Kurchatov Institute," 117218 Moscow, Russia.
⁴ National Research Nuclear University "MEPhI," 115409 Moscow, Russia.
⁵ Dubna State University, 141982 Dubna, Russia.
⁶ National Research Centre "Kurchatov Institute," Kurchatov sq. 1, 123182 Moscow, Russia.
⁷ Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland.
⁸ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
⁹ II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Giessen, Germany.
¹⁰ Laboratory of Information Technologies, JINR, 141980 Dubna, Russia.
¹¹ Institute of Nuclear Physics, 050032 Almaty, Kazakhstan.
¹² Nuclear Research Institute, 670000 Dalat, Vietnam.
¹³ AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Krakow, Poland.
¹⁴ Institute of Nuclear Physics PAN, Radzikowskiego 152, 31342 Kraków, Poland.
¹⁵ Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden.

PMID: 32004016
DOI: 10.1103/PhysRevLett.124.022502

Abstract

The ^{7}H system was populated in the ^{2}H(^{8}He,^{3}He)^{7}H reaction with a 26 AMeV ^{8}He beam. The ^{7}H missing mass energy spectrum, the ^{3}H energy and angular distributions in the ^{7}H decay frame were reconstructed. The ^{7}H missing mass spectrum shows a peak, which can be interpreted either as unresolved 5/2^{+} and 3/2^{+} doublet or one of these states at 6.5(5) MeV. The data also provide indications of the 1/2^{+} ground state of ^{7}H located at 1.8(5) MeV with quite a low population cross section of ∼25 μb/sr within angular range θ_{c.m.}≃(17°-27°).