Two independent methods: Asymptotic Normalization Coefficients (ANC) and Modified Diffraction Model (MDM) were applied to new and existing experimental data to search for states with enhanced radii ...in isobaric analogue states (IAS) of 12B and 12N. The ANC analysis of the 11B(d,p)12B reaction at Ed = 21.5 MeV has confirmed neutron halo existence for two states of 12B: 2−, 1.67 MeV and 1−, 2.62 MeV 1. Some new results were obtained for higher excited states: halo-like states were observed for 0+, 2.72 MeV and 3−, 3.39 MeV states. It should be mentioned that the last one is unbound state, which is 19 keV above the neutron emission threshold and in both states last neutron has a non-zero orbital momentum (ln=1 and ln=2 correspondingly). We propose to use MDM to study isobaric analogue states of 12B in the mirror 12N nucleus and apply it to analyze the (3He,t) reaction data. The existing in the literature data are not completed enough to make definite conclusion about halo in the 2− and 1− states of 12N. This fact simulated us to carry out a new experiment on the 12C(3He,t)12N reaction at the end of 2018. The measurements were conducted at the University of Jyväskylä (Finland) using the K130 cyclotron to produce a 3He beam at E(3He)=40 MeV. The differential cross sections of the 12C(3He,t)12N reaction were measured in the c.m. angular range 8°-70°. Preliminary results for angular distributions are obtained. MDM analysis of preliminary (3He,t) experimental data is done.
The saturation yield of the rhenium radioisotopes sup.186Re, sup.188Re, and sup.189Re on irradiation of a sup.186W target by the nuclei sup.4He, sup.4He, sup.1H, and sup.2H with energy 47, 25, 15.3, ...and 19 MeV, respectively, was measured by the activation method. The chosen energy of the accelerated particles made it possible to minimize the contribution of the activity of long-lived rhenium radioisotopes in the desired radionuclides. The highest yield 3240 + or - 330 MBq/pA was obtained for the radioisotope sup.186Re in the reaction sup.186W(sup.2H, 2n).sup.186Re. The obtained yield makes it possible to plan on using in radioimmunotherapy the radionuclide sup.186Re produced by means of this reaction.
The foundations of negative experiences of dental treatment and clinical observation are laid in childhood, and the patient’s further attitude towards dental procedures depends on how the child’s ...first acquaintance with a dentist goes. Anxiety, tension and fear of upcoming pain can lead to the development of varying degrees of dental phobia. Children's fears do notallow for complete and timely treatment, which requires the development of measures to correct them.
Aim.
Develop a technique for reducing anxiety in patients with dental anxiety at a pediatric dental appointment.
Materials and methods.
The study involved 90 children aged 6-15 years. They were divided into groups depending on the strength of the nervous system. In each group, the level of dental anxiety was determined and methods were used to reduce it, which included: motivational interviewing, art therapy, adaptation using hardware technologies.
Results.
After carrying out adaptation techniques for children, a decrease in dental anxiety was observed in each group of subjects. The technique was most effective in the group of children with a strong nervous system.
Conclusions.
This developed complex of psychological support for patients at a pediatric dental appointment (procedures promoting relaxation, distraction, perceived control) reduces the level of dental anxiety and improves the indicators of vegetative support.
A study of the neutron structure of the ground state of
7
He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped ...pions. In particular, the reactions
9
Be(
π
−
,
d
) X and
11
B(
π
−
,
dd
) X have been investigated where X denotes any system with five neutrons and two protons — the constituencies of a
7
He nucleus. The results point out to the existence of a halo-like configuration of the ground state of
7
He with all three neutrons outside of the alpha particle core. The structure of this complicated halo-like state is determined by the correlations of neutrons in the
p
3/2
and
p
1/2
shells. The result would be in agreement with the previous works pointing out to a considerable mixing of configurations containing neutrons in the
p
3/2
and
p
1/2
states.
The differential cross sections for the
12
C(
3
He,
t
)
12
N reaction leading to formation of the 1
+
(ground state), 2
+
(0.96 MeV), 2
−
(1.19 MeV), and 1
−
(1.80 MeV) states of
12
N are measured at
...E
(
3
He) = 40 MeV. The analysis of the data is carried out within the modified diffraction model and distorted wave Born approximation. Increased rms radii have been obtained for the ground, 2
−
(1.19 MeV), and 1
−
(1.80 MeV) states. We revealed that
12
B,
12
N, and
12
C in the isobaric analogue states with
T
= 1, and spin-parities 2
−
and 1
−
have increased radii and exhibit properties of neutron and proton halo states.
The isobaric analog states with isospin
T
= 1 in triplet of the
A
= 14 nuclei:
14
C,
14
N, and
14
O, are studied. The signs of a neutron halo in the 1
−
(6.09 MeV) state of
14
C have been revealed ...earlier by two groups. We confirm this result and study isobaric analog 1
−
states of neighboring
14
N and
14
O nuclei. The differential cross sections for the
14
C(α, α)
14
C* (6.09 MeV, 1
−
) inelastic scattering, the
13
C(
3
He,
d
)
14
N* (8.06 MeV, 1
−
), and the
14
N(
3
He,
t
)
14
O* (5.17 MeV, 1
−
) reactions are analyzed by two methods: the modified diffraction method and the method of asymptotic normalization coefficients. The rms radii for all three mirror nuclei in the studied 1
−
states are found almost the same: (2.7 ± 0.1) fm for
14
C, (2.67 ± 0.07) fm for
14
N, and (2.6 ± 0.2) fm for
14
O. The signs of the proton halo in the 1
−
state of
14
N are identified for the first time.
This work is devoted to the use of beams of radioactive nuclei for applied purposes--to study the wear-resistance of materials used in different industries. The crux of the method is that the ...radioactive nuclei obtained in the nuclear reactions sup.1H(sup.7Li, sup.7Be) and sup.1H(sup.10B, sup.7Be) are implanted in the experimental sample. After implantation of the nuclei, the sample undergoes wear tests. The gamma-radiation of the implanted nuclei is high-energy; the spectrum is comparatively simple and does not produce appreciable radiation damage in the test samples. The method has been successfully tested in determining the wear-resistance of machine parts and mechanisms.
The activation method was used to determine the cross sections of the nuclear reactions sup.82Kr(sup.3He, 3n)sup.82Sr, sup.83Kr(sup.3He, 4n)sup.82Sr, and sup.84Kr(sup.3He, 5n)sup.82Sr in the sup.3He ...energy range 20-75 MeV on targets with highly enriched krypton isotopes. The results were used to calculate the sup.82Sr yield in a yield-optimized cascade target with sup.82,83,84Kr and initial sup.3He energy 75 MeV. The computed sup.82Sr yield was equal to 2.9 MBqf(microA x h), which makes it possible to count on the practical application of the method of sup.82Sr production based on the reactions sup.82,83,84Kr(sup.3He, xn)sup.82Sr in a cascade target.
The concept of a solution target for obtaining the radioisotope
82
Sr via the reaction Rb(p, xn)
82
Sr is propounded. A computational estimate of the main technological parameters of a solution ...target is made. The
82
Sr yield in a solution target is calculated for solutions of certain compounds of rubidium and initial proton energy 70 MeV. It is shown that the highest
82
Sr yield 7.44 MBq/(μA·h) in a solution target can be obtained by using a saturated solution of RbF. The solution fl ow rate in the circulation loop of the target allowing the operation of a target without boiling-up in a 100 μA proton beam is obtained for a target solution with RbF. The mass/size parameters of the heat-exchanger allowing the solution to be cooled tothe initial temperature in a single pass are calculated. The infl uence of radiolysis of the proton-irradiatedsolution on the operation of the target is determined. It is shown that on the whole radiolysis of the solution target is not large but does require defi nite efforts to utilize the hydrogen.
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