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Information × Registration Number 0222U003189, 0116U004452 , R & D reports Title Study of lowenergy part of excitation spectra of helium isotopes popup.stage_title Head Povoroznyk Orest M, Registration Date 21-02-2022 Organization Institute for Nuclear Research of NAS of Ukraine popup.description2  The object of study is unrelated states of helium isotopes The aim of the work is to determine the energy parameters of low-energy excited states of 4,5,6He and 5Li nuclei, the excitation of which is removed by decay into two particles ( + n), ( + p). Research methods - experimental kinematic complete and kinematically incomplete study of three-particle 2H(,p) n, 3H(,d) n reactions by analyzing inclusive and two-dimensional coincidence spectra obtained as a result of  + (2H, 3H, 3He) interaction. The refined energy characteristics of the first excited states 4, 5,6He and 5Li are obtained. The projections of two-dimensional spectra of p-α coincidences from the four-particle reaction 3H (α, pα) nn at the energy of alpha particles of 27.2 MeV (0<Еex<3.5MeV) on the energy axis of alpha particles for six pairs of angles are analyzed. The results of Monte Carlo parameterization showed that in the case of the first excited state, the configuration particle + dinetron "and" alpha particle + cigar "in different ratios. Two-dimensional spectra of tt, t-3He and dd coincidences from three-particle 3H (, tt) p, 3H (, t3He) n and 3H (, td) d reactions as a result of interaction of a beam of alpha particles with energy E= 67.2 were obtained and analyzed MeV with Ti-T target in a kinematically complete experiment within the Monte Carlo method. The values of excitation energies, energy widths for excited 4He states and the ratio of their different decay modes, namely p + t, n + 3He and d + d, are determined. The analysis of inclusive proton spectra obtained earlier from the 3H (α, p) αnn reaction using the Monte Carlo simulation method, which showed the population of two excited levels of the 6He nucleus with the energy parameters E2ex.s. = 2.40 (0.20) MeV, Γ2ex.s = 2.39 (0.30) MeV. and E3ex.s. = 2.9 (0.17) MeV, Γ2ex.s = 2.39 (0.27) MeV .. These results are consistent with the results of correlation kinematically incomplete experimental studies of four - particle 3H Product Description popup.authors Gorpinich Olga K Karlyshev Jurij Ya Roznyuk Jurij S popup.nrat_date 2022-03-09 Close