Search for isobar-analog states of superheavy hydrogen isotopes5-7He

International Conference on Particle Physics and Astrophysics

Chernyshev, B.A.^1 ; Gurov, Yu B^1 ; Yu Korotkova, L.^1 ; Kuznetsov, D.S.^1 ; Lapushkin, S.V.^1 ; Tel'Kushev, M.V.^1 ; Schurenkova, T.D.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^1

关键词: Excited levels;    Helium isotopes;    Hydrogen isotope;    Light nuclei;    Low-energy;    Reaction channels;    Three body;    X-channel;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/675/2/022002/pdf
DOI  :  10.1088/1742-6596/675/2/022002

来源: IOP

【 摘 要 】

Search for isobar-analog states (IAS) of superheavy hydrogen isotopes5-7H was performed among the high-excited states of helium isotopes5-7He. The excited spectra were measured in stopped pion absorption by light nuclei. The experiment was performed at low energy pion channel of LANL with two-arm multilayer semiconductor spectrometer. Excited states of5-7He were observed in three-body reaction channels on10,11B nuclei. Several excited levels were observed for the first time.6He excited state with Ex= 27.0(8) MeV observed in10B(π-,pt)X channel is an IAS candidate for6H with Er∼ 5.5 MeV.7He excited state with Ex= 24.8(4) MeV observed in10B(π-,pd)X,nB(π-,pt)X andnB(π-,dd)X channels is an IAS candidate for7H with Er∼ 3 MeV.