A convenient method of calculation has been developed to determine the cluster spectroscopic factors for ejection excited and complex fragments ($^{4}\mathrm{He}$, $^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{8}\mathrm{Be}$, etc.) from low-lying levels $p$-shell nuclei followed by transition both states lowest shell configuration daughter nucleus its hole states. The can be used analyze knock-out, transfer reactions induced heavy ions, etc.NUCLEAR STRUCTURE nuclei; calculated factors. Harmonic...

Nuclear clustering, alpha decays, and multiparticle correlations are important components of nuclear dynamics. In this work we put forward the cluster-nucleon configuration interaction model. We use modern approach with advanced realistic shell-model Hamiltonians in order to study clustering phenomena; is facilitated by algebraic properties many-nucleon configurations harmonic oscillator basis. Using a translationally invariant formalism built cluster channels that satisfy Pauli exclusion...

Background: Clustering phenomena in $N\ensuremath{\ne}Z$ nuclei provide an opportunity to understand the interplay between cluster and nucleon degrees of freedom.Purpose: To study resonances ${}^{18}\mathrm{O}$ spectrum, populated ${}^{14}\mathrm{C}+\ensuremath{\alpha}$ elastic scattering.Method: The thick target inverse kinematics technique was used measure excitation function for scattering. A 42-MeV ${}^{14}\mathrm{C}$ beam populate states energy up 14.9 MeV ${}^{18}\mathrm{O}$. analysis...

The spectroscopic factors SDelta Delta and SNN of the deuteron have been calculated for NN channels in terms six-quark model with coloured quarks. This is similar to nuclear cluster model. appearance isobar due effect quark exchange between nucleons. Values /SNN close results other approaches can be obtained reasonable parameters deuteron.

An approach for explicit consideration of cluster effects in nuclear systems and accurate ab initio calculations characteristics nuclei is devised. The essential block the a construction basis which incorporates both conventional No-Core Shell Model wave functions translationally-invariant various channels. results computations total binding energies 8Be nucleus as well spectroscopic factors channels (amount clustering) are presented. unexpected fresh result rigorous study that contribution...

A method for calculating the fractional parentage coefficients many-quark systems in scheme UCST(12) contains/implies UCS(6)*UT(2) UC(3)*US(2)*UT(2) based on complementarity of permutation SN and unitary U(n) groups, is developed. The scalar factors Clebsch Gordan chain groups U(mn) U(m)*U(n) are shown to be independent ranks mn, m n determined by Young schemes associated with them. Tables low states six-quark (6q) system presented.

A new convenient method for accurate theoretical calculations of quantities traditional theory nuclear reactions such as widths resonances (including subthreshold), and asymptotic normalization coefficients is proposed. This provides a step towards the development alternative technique an ab initio description light nuclei spectroscopic data. As illustration this method, computational results all relevant two-body decay channels known some theoretically predicted states $^{7}\mathrm{Li}$...

A unified microscopic approach based on the algebraic version of resonating group model has been realized for description radiative capture reactions 3H(α, γ)7Li and 3He(α, γ)7Be, which play an important role modern nuclear astrophysics. The astrophysical S-factors branching ratios between to ground first excited states 7Li 7Be nuclei have calculated. comparison with most recent experimental data demonstrates a good agreement.

Scrupulous theoretical study of 8Be nucleus states, both clustered and non-clustered, is performed over a wide range the excitation energies. The quantities which characterize degree alpha-clustering these states: spectroscopic factors, cluster form factors as well alpha-decay widths are computed in framework an accurate ab initio approach developed. Other basic properties spectrum: binding energies, mean values isospin calculated simultaneously. In majority instances results computations...

The energies and decay widths of the states exotic $^{7}\mathrm{He}$ nucleus are studied in an ab initio approach. spectrum these is calculated using no-core shell model (NCSM) a corresponding extrapolation procedure. Daejeon16 potential, well proved on large amount data, used calculations. previously developed NCSM-based approach, which includes method for constructing basis functions cluster channels procedure matching form factors obtained within this with asymptotic wave functions,...

A calculation technique of spectroscopic amplitudes the lightest virtually excited clusters d, t, and \ensuremath{\alpha} in p-shell nuclei is presented. These are incorporated into a cluster quasielastic knockout theory based on Glauber-Sitenko multiple scattering formalism where deexcitation virtual taken account outgoing distorted wave described by means an eikonal approximation. Numerical calculations for few target knocked-out complement our previous results show that strong influence...

We develop an approach to microscopic and ab initio description of clustered systems, states with halo nucleon one-nucleon resonances. For these purposes a basis combining ordinary shell-model components cluster-channel terms is built up. The transformation wave functions the uniform Slater-determinant type performed using concept cluster coefficients. resulting orthonormalized used for calculating eigenvalues eigenvectors Hamiltonians in framework approaches. Calculations resonance 5He, 9Be...

A new kind of cluster quasieleastic knockout experiment is proposed based on the generalized distorted wave impulse approximation calculation which uses Glauber-Sitenko multiple scattering theory and takes into account deexcitation virtual excited clusters in nucleus. Elements general formalism are presented, including discussion difference between ``fast'' ``slow'' processes. The reaction $^{12}\mathrm{C}$(p,p\ensuremath{\alpha}${)}^{8}$Be considered detail. It shows a strong dependence...