The crucial phenomenological and experimental predictions for new physics are outlined, where the number of problems of the Standard Model (neutrino masses and oscillations, dark matter, baryon ...asymmetry of the Universe, strong CP-problem) could find their solutions. The analogies between the cosmological neutrino mass scale from the early universe data and laboratory probes are discussed, as well as the search for new physics and phenomena.
New experimental measurements for
16
O +
12
C elastic scattering angular distribution at
E
lab
= 27 MeV were performed at the cyclotron DC-60 INP RK. The measured data as well as the previous ...measurements for
16
O +
12
C angular distributions in the energy range
E
lab
= 20–140 MeV are subjected to detailed analysis using the double folding optical potential. For this purpose, different models of interaction potentials are used, such as the BDM3Y1-Reid and the CDM3Y1-Paris based on the M3Y interactions. The new B3Y-Fetal potentials are also tested, and the efficiency of the DDB3Y1-Fetal interaction to increase the saturation properties of cold nuclear matter was studied in comparison with the well-known BDM3Y1-Reid and CDM3Y1-Paris interactions.
The angular distributions of
13
C elastically scattered by
9
Be nuclei were measured at
E
Lab
(
13
C) = 16.25 and 19.5 MeV. The measured angular distributions were analyzed via the optical model and ...the DWBA within the coupled reaction channels methods. In addition to this, the previously obtained data were reanalyzed at energies
E
Lab
= 22.75, 28.12, 36.15, 57.77 and 72.88 MeV. The aim of the study was to elucidate the role of the
α
-cluster transfer mechanism in the large-angle scattering. As a result of these calculations, the optimal parameters of the potentials and their energy dependence were obtained for
13
C+
9
Be nuclear system. The data at the backward angles are fairly well reproduced. The spectroscopic amplitudes were extracted for the
13
C
→
9
Be +
α
configuration at various energies. The results are compared with previously reported values.
The proton and deuteron pickup reactions
and
were studied with the
radioactive beam produced by the new fragment separator ACCULINNA-2 at FLNR, JINR. These measurements were initially motivated as ...the test reactions intended for the elucidation of results obtained in the study of the extremely neutron-rich
H and
H systems created in the
and
reactions with the use of the same setup. In the
reaction the
Li ground-state (
) and its first excited state (2.69 MeV,
) were identified in the low-energy region of its excitation spectrum. The differential cross sections for the
population were extracted at the forward center-of-mass angles (
) and compared with the FRESCO calculations. Spectroscopic factor of
, derived by a model suggesting the
clustering was found in accord with the experimental data. The energy spectrum of
Li populated in the
reaction shows the strong peak which corresponds to the excitation of the second excited state of
Li (2.25 MeV,
). The fact that the ground and the first excited states of
Li were not observed in this reaction is consistent with the shell-model structure of the nuclei involved.
Setup fitting the requirements for the detailed study of the five-body decay of the
7
H nucleus obtained as a result of the proton transfer from the
8
He projectiles to the deuterium target nuclei is ...being built at the radioactive beam line of ACCULINNA-2 separator in the G.N. Flerov Laboratory of Nuclear Reactions. Described here is the assembly of 100 BC-404 plastic scintillators, intended for neutron detection, the annular Si detector telescope for the
3
He recoils, and the detector array providing the Δ
E
–
E
-TOF registration of
3
H nuclei emitted at the
7
H decay. Results obtained by the Monte Carlo simulations made for the energy values and flight passes of all these particles are given together with the luminosity expected for the discussed experiments.
In the recent work Nikolskii et al., Phys. Rev. C 105, 064605 (2022) the 2H(8He,4He)6H reaction was used for the study of the extreme neutron-rich 6H isotope. A broad bump was observed in the ...measured 6H spectrum interpreted as the broad overlapping ground and some low-lying states of this nuclide. There could be certain doubts in the interpretation of this work: in conditions of the limited phase space it is not impossible that the structure in the missing mass spectrum of 6H is actually induced by the resonant states populated by some other channels opened in the 8He+2H interaction. This work provides a body of the evidence for the correct channel identification and for the absence of the 6H resonances at energy ET = 0 − 3.5 MeV above the 3H+3n decay threshold. In addition the first strong experimental evidence is given that the 6H → 5H*+n → 3H+3n sequential decay is the dominating 6H decay channel.
The commissioning of the new fragment separator ACCULINNA-2 at FLNR JINR is accomplished. The separator is destined to expand the possibilities in studies of dripline nuclei performed with the exotic ...secondary radioactive ion beams (RIBs) at energies of (5 - 50) AMeV. The projected high transmission and purification level were confirmed experimentally for a number of RIBs in the last two years. The ACCULINNA-2 setup will become a backbone facility at FLNR for the research in the field of light exotic nuclei. This report shows the current status of the separator, describes the obtained RIBs parameters and first experiments as well, provides the overview of the developing detection, monitoring and control subsystems.
The one-neutron transfer
2
H(
9
Li,
p
)
10
Li reaction has been investigated at 29
A
MeV incident energy at the ACCULINNA-2 facility (Flerov Laboratory of Nuclear Reactions, Joint Institute for ...Nuclear Research). The setup has been used in order to detect the recoil protons at backward angles in coincidences with the outgoing
9
Li and neutrons from the
10
Li decay at forward angles. This setup allows to study the
10
Li emitted in the crucial region at forward angles in the center of mass. The preliminary results in the part of the analysis of double proton–
9
Li coincidence are reported.
Investigation of the
7
H-system in the experiment conducted at the fragment separator ACCULINNA-2 in the
8
He(
2
H,
3
He)
7
H reaction requires to detect the recoil
3
He ions with energy down to 6 ...MeV. For this purpose two
particle telescopes are used, with each telescope having in front a thin (20-μm) Si strip detector (
). The maps of thickness heterogeneity of the thin detectors were determined by measuring the energy losses of the
226
Ra α-particles. The adopted thickness normalization method provides a good identification of the
3
He nuclei being recorded in the presence of a high
4
He background. Two approaches were used for calculating the energy losses of the identified
3
He and
4
He reaction ejectiles and reconstructing their energy values available at the exit from the deuterium target. The developed techniques were applied for the
7
H missing-mass reconstruction.
Elastic and inelastic scattering angular distributions (ADs) for the
6
Li +
144
Sm system in the 21–45 MeV energy range are analyzed with a Woods-Saxon phenomenological and two microscopic optical ...potentials, with one derived from the São Paulo formulation and the other from cluster folding of realistic alpha and deuteron potentials. Energy-dependent real,
J
V
, and imaginary,
J
W
, potential volume integrals are extracted from each potential system. It is shown that their variation in the region of the Coulomb barrier displays the normal threshold anomaly of strong coupling between the real and imaginary potentials. The reduced energy dependence on the extracted reduced reaction cross sections for the
6
Li +
144
Sm system is presented and compared to the calculated one using Wong’s formula. The strength and energy dependence of the inelastic ADs are reasonably described using the adopted potentials within the framework of the coupled channels method.
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