Evidence for the First Excited State of ^{7}H.,Physical Review Letters

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Evidence for the First Excited State of ^{7}H.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-17 , DOI: 10.1103/physrevlett.124.022502
A A Bezbakh _{1,

2} , V Chudoba _{1,

2} , S A Krupko _{1,

3} , S G Belogurov _{1,

4} , D Biare ₁ , A S Fomichev _{1,

5} , E M Gazeeva ₁ , A V Gorshkov ₁ , L V Grigorenko _{1,

4,

6} , G Kaminski _{1,

7} , O A Kiselev ₈ , D A Kostyleva _{8,

9} , M Yu Kozlov ₁₀ , B Mauyey _{1,

11} , I Mukha ₈ , I A Muzalevskii _{1,

2} , E Yu Nikolskii _{1,

6} , Yu L Parfenova ₁ , W Piatek _{1,

7} , A M Quynh _{1,

12} , V N Schetinin ₁₀ , A Serikov ₁ , S I Sidorchuk ₁ , P G Sharov _{1,

2} , R S Slepnev ₁ , S V Stepantsov ₁ , A Swiercz _{1,

13} , P Szymkiewicz _{1,

13} , G M Ter-Akopian _{1,

5} , R Wolski _{1,

14} , B Zalewski _{1,

7} , M V Zhukov ₁₅

Affiliation

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

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°).

中文翻译：

^ {7} H的第一激发态的证据。

在^ {2} H（^ {8} He，^ {3} He）^ {7} H反应中使用26 AMeV ^ {8} He光束填充^ {7} H系统。重建了^ {7} H缺失质能谱，^ {3} H能量和^ {7} H衰变帧中的角分布。^ {7} H丢失质谱显示一个峰，可以将其解释为未解析的5/2 ^ {+}和3/2 ^ {+}双峰或这些状态之一（6.5（5）MeV）。数据还提供了位于{{7} H的1/2 ^ {+}基态的指示，其位于1.8（5）MeV，在θ_{cm} angular的角度范围内具有很低的总体截面〜25μb/ sr。（17°-27°）。

更新日期：2020-01-17

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