Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons
Experiments on elastic and inelastic scattering of deuterons by ¹²C, ⁴⁸Ti, ⁵⁸;⁶⁴Ni nuclei at laboratory energy of 37 MeV for angles ranging from 16° to 61° were carried out on the U-240 isochronous cyclotron of the Institute for Nuclear Research, National Academy of Science of Ukraine. A broad maxim...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2007
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| Цитувати: | Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons / V.I. Grantsev, V.V. Davydovskyy, K.K. Kisurin, S.E. Omelchuk, G.P. Palkin, Yu.S. Roznyuk, B.A. Rudenko, V.S. Semenov, L.S. Saltykov, L.I. Slusarenko, B.G. Struzhko, V.K. Tartakovsky, V.A. Shytiuk // Вопросы атомной науки и техники. — 2007. — № 5. — С. 13-17. — Бібліогр.: 12 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1101572016-12-31T03:01:49Z Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons Grantsev, V.I. Davydovskyy, V.V. Kisurin, K.K. Omelchuk, S.E. Palkin, G.P. Roznyuk, Y.S. Rudenko, B.A. Semenov, V.S. Saltykov, L.S. Slusarenko, L.I. Struzhko, B.G. Tartakovsky, V.K. Shytiuk, V.A. Ядерная физика и элементарные частицы Experiments on elastic and inelastic scattering of deuterons by ¹²C, ⁴⁸Ti, ⁵⁸;⁶⁴Ni nuclei at laboratory energy of 37 MeV for angles ranging from 16° to 61° were carried out on the U-240 isochronous cyclotron of the Institute for Nuclear Research, National Academy of Science of Ukraine. A broad maximum comprising the giant resonance in the spectrum of scattered deuterons for scattering angles less than 21° is observed at the nucleus excitation energies ranging from 12 to 30 MeV. The observed maximum was theoretically described in diffraction approximation after summing the cross-section over all final nucleus states. Виконано експерименти з пружного та непружного розсіяння дейтронів ядрами ¹²C, ⁴⁸Ti, ⁵⁸;⁶⁴Ni при енергії 37 МеВ на кути від 16° до 61° на ізохронному циклотроні У-240 Інституту ядерних досліджень НАН України. В енергетичному спектрі розсіяних дейтронів для кутів розсіяння менше 21° спостерігається широкий максимум при енергіях збудження ядер від 12 до 30 МеВ, який включає в себе максимум гігантського резонансу. Широкий максимум було описано теоретично в дифракційному наближенні після підсумовування перерізу за всіма кінцевими ядерними станами. Выполнены эксперименты по упругому и неупругому рассеянию дейтронов ядрами ¹²C, ⁴⁸Ti, ⁵⁸;⁶⁴Ni при энергии 37 МэВ на углы от 16° до 61° на изохронном циклотроне У-240 Института ядерных исследований НАН Украины. В энергетическом спектре рассеянных дейтронов для углов рассеяния меньше 21° наблюдается широкий максимум при энергиях возбуждения ядер от 12 до 30 МэВ, включающий в себя максимум гигантского резонанса. Широкий максимум был описан теоретически в дифракционном приближении после суммирования сечения по всем конечным ядерным состояниям. 2007 Article Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons / V.I. Grantsev, V.V. Davydovskyy, K.K. Kisurin, S.E. Omelchuk, G.P. Palkin, Yu.S. Roznyuk, B.A. Rudenko, V.S. Semenov, L.S. Saltykov, L.I. Slusarenko, B.G. Struzhko, V.K. Tartakovsky, V.A. Shytiuk // Вопросы атомной науки и техники. — 2007. — № 5. — С. 13-17. — Бібліогр.: 12 назв. — англ. 1562-6016 PACS: 24.30.Cz, 13.75.Cs, 21.30.Fe, 21.60.Jz http://dspace.nbuv.gov.ua/handle/123456789/110157 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Ядерная физика и элементарные частицы Ядерная физика и элементарные частицы |
| spellingShingle |
Ядерная физика и элементарные частицы Ядерная физика и элементарные частицы Grantsev, V.I. Davydovskyy, V.V. Kisurin, K.K. Omelchuk, S.E. Palkin, G.P. Roznyuk, Y.S. Rudenko, B.A. Semenov, V.S. Saltykov, L.S. Slusarenko, L.I. Struzhko, B.G. Tartakovsky, V.K. Shytiuk, V.A. Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons Вопросы атомной науки и техники |
| description |
Experiments on elastic and inelastic scattering of deuterons by ¹²C, ⁴⁸Ti, ⁵⁸;⁶⁴Ni nuclei at laboratory energy of 37 MeV for angles ranging from 16° to 61° were carried out on the U-240 isochronous cyclotron of the Institute for Nuclear Research, National Academy of Science of Ukraine. A broad maximum comprising the giant resonance in the spectrum of scattered deuterons for scattering angles less than 21° is observed at the nucleus excitation energies ranging from 12 to 30 MeV. The observed maximum was theoretically described in diffraction approximation after summing the cross-section over all final nucleus states. |
| format |
Article |
| author |
Grantsev, V.I. Davydovskyy, V.V. Kisurin, K.K. Omelchuk, S.E. Palkin, G.P. Roznyuk, Y.S. Rudenko, B.A. Semenov, V.S. Saltykov, L.S. Slusarenko, L.I. Struzhko, B.G. Tartakovsky, V.K. Shytiuk, V.A. |
| author_facet |
Grantsev, V.I. Davydovskyy, V.V. Kisurin, K.K. Omelchuk, S.E. Palkin, G.P. Roznyuk, Y.S. Rudenko, B.A. Semenov, V.S. Saltykov, L.S. Slusarenko, L.I. Struzhko, B.G. Tartakovsky, V.K. Shytiuk, V.A. |
| author_sort |
Grantsev, V.I. |
| title |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| title_short |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| title_full |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| title_fullStr |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| title_full_unstemmed |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| title_sort |
excitation of medium nuclei in the continuum region in inelastic scattering of deuterons |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2007 |
| topic_facet |
Ядерная физика и элементарные частицы |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/110157 |
| citation_txt |
Excitation of medium nuclei in the continuum region in inelastic scattering of deuterons / V.I. Grantsev, V.V. Davydovskyy, K.K. Kisurin, S.E. Omelchuk, G.P. Palkin, Yu.S. Roznyuk, B.A. Rudenko, V.S. Semenov, L.S. Saltykov, L.I. Slusarenko, B.G. Struzhko, V.K. Tartakovsky, V.A. Shytiuk // Вопросы атомной науки и техники. — 2007. — № 5. — С. 13-17. — Бібліогр.: 12 назв. — англ. |
| series |
Вопросы атомной науки и техники |
| work_keys_str_mv |
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2025-07-08T00:10:47Z |
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2025-07-08T00:10:47Z |
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| fulltext |
EXCITATION OF MEDIUM NUCLEI IN THE CONTINUUM
REGION IN INELASTIC SCATTERING OF DEUTERONS
V.I. Grantsev, V.V. Davydovskyy∗, K.K. Kisurin, S.E. Omelchuk,
G.P. Palkin, Yu.S. Roznyuk, B.A. Rudenko, V.S. Semenov, L.S. Saltykov,
L.I. Slusarenko, B.G. Struzhko, V.K. Tartakovsky, V.A. Shytiuk
Insitute for Nuclear Research, 03680, Kyiv, Ukraine
(Received March 20, 2007)
Experiments on elastic and inelastic scattering of deuterons by 12C, 48Ti, 58,64Ni nuclei at laboratory energy of
37 MeV for angles ranging from 16◦ to 61◦ were carried out on the U-240 isochronous cyclotron of the Institute for
Nuclear Research, National Academy of Science of Ukraine. A broad maximum comprising the giant resonance in
the spectrum of scattered deuterons for scattering angles less than 21◦ is observed at the nucleus excitation energies
ranging from 12 to 30 MeV . The observed maximum was theoretically described in diffraction approximation after
summing the cross-section over all final nucleus states.
PACS: 24.30.Cz, 13.75.Cs, 21.30.Fe, 21.60.Jz
1. INTRODUCTION
The continuum in the energy spectrum of practically
all multi-nucleon nuclei can be exited by various par-
ticles (including complex particles).
The excitation of nucleus states in the region of
the giant resonance was discovered in inelastic scat-
tering of helions by medium nuclei not long ago [1].
In the spectra of 3He-particles scattered by 58Ni and
64Ni isotopes, an asymmetrical broad maximum cor-
responding to the excitation energy U = 16−20 MeV
was observed. In this energy domain, monopole as
well as dipole and quadrupole resonances can be ex-
cited [2, 3, 4]. With the reference to the analysis
carried out in [4], the authors of [1] identify the ob-
served asymmetrical maximum as a manifestation
of the monopole and dipole resonances. According
to [1, 2], the energy of the giant quadrupole reso-
nance excitation corresponds to 16.3 MeV for 58Ni
and 15.8 MeV for 64Ni, whereas the energy of the
giant quadrupole resonance excitation – 20.7 MeV
for 58Ni and 20.0 MeV for 64Ni. Thus the ob-
served asymmetrical maximum at the excitation en-
ergy U = 16 − 20 MeV apparently corresponds to
the excitation of both monopole and quadrupole res-
onances. According to theoretical estimations [3], an
excitation of the giant dipole resonance is quite small.
In order to describe the results of our experiments
on measurement of the cross-sections in the contin-
uum domain in the inelastic scattering of deuterons
by 12C, 48Ti, 58,64Ni nuclei, we used the developed
theory of a coherent and non-coherent scattering of
particles by nuclei as well as the diffractive nucleus
model.
2. EXPERIMENTAL RESULTS
Experimental study of inelastic scattering of
deuterons by atomic nuclei was carried out on the
isochronous cyclotron U-240 of Institute for Nuclear
Research, NAS of Ukraine. A beam of deuterium
ions with energy Ed = 37 MeV was transported to
the scattering chamber through the beam collimat-
ing system.
Beam collimation was carried out with
quadrupole lenses and slit diaphragms. ”Cutting-
off” diaphragm, located behind shielding wall of
experimental box, was used to reduce background
scattering. Ion beam quality was checked by TV
cameras and residual current measurement from the
diaphragms.
The target, detectors and part of electronic mod-
ules were placed in scattering chamber. Deuterons
were registered by two telescopes ∆E − E, consist-
ing of ∆E(Si) detector with thickness of 150 µm and
scintillation E detector with thickness of 25 mm. In-
cident beam current was measured by Faraday cup
beyond the target. Remote control and observation
of collimating system, detectors and target were car-
ried out from the measurement center.
Inclusive spectra were accumulated as described
earlier in [5]. Increase of productivity of spectra ac-
cumulation was achieved by use of 512 K memory
modules in CAMAC standard.
Local network client with CAMAC crate pre-
formed preprocessing of experimental information
and recorded in to the network drive. After that,
it became accessible at any point of local network.
In the experiment, targets from carbon, titanium
and nickel isotopes were used. To carry out energy
∗E-mail address: odavi@kinr.kiev.ua
PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY, 2007, N5.
Series: Nuclear Physics Investigations (48), p.13-17.
13
10 15 20 25 30 35
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
d
d2 σ/
dΩ
dU
(m
b/
sr
.M
eV
)
U (MeV)
12C
natTi
58Ni
64Ni
(d,d')
θ =160
0 5 10 15 20 25 30 35
1
10
100
c
d2 σ/
dΩ
dU
(m
b/
sr
.M
eV
)
U (MeV)
12C
natTi
58Ni
64Ni
(d,d')
θ =160
0 20 40 60 80 100 120
0
200
400
600
800
1000
1200
1400
C
ou
nt
s
Channel number
160
210
360
470
64Ni(d,d')
b
0 50 100 150
1
10
100
1000
10000
100000
C
ou
nt
s
Channel number
160
210
360
470
64Ni(d,d')a
Fig.1. Experimental data:
a, b – scattering of deuterons by 64Ni at 16◦, 21◦, 36◦ and 47◦;
c, d – cross-sections of the deuteron scattering by 12C, 48Ti, and 58,64Ni at 16◦
calibration, additional measurements on target from
polyethylene enriched with deuterium were done.
All targets were self-supported foils, thicknesses
and enrichment of which are stated in the table.
Target characteristics
Element Thickness, mg/cm2 Enrichment, %
12C 4,5 98,9
48Ti 7,48 Nat. (73,8)
58Ni 9,37 99,5
64Ni 8,48 91,0
Inclusive spectra of deuterons on targets 12C, 48Ti,
and 58,64Ni in wide energy range at scattering angles
16◦ ≤ θ ≤ 61◦ were measured. Statistical error of
measurements was 3% for 12C, 48Ti nuclei and 5%
– for nickel isotopes. Energy calibration of spectra
was carried out by elastic scattering of deuterons,
measured on CD2 target, on deuterium and carbon
nuclei.
In Fig.1,a, experimental spectra, obtained on
64Ni nucleus at angles θ = 16◦, 21◦, 36◦ and 47◦
in all energy measurement range are given; and in
Fig.1,b – in the range of high excitation energies.
Spectra, given in Fig.1, are typical for all investi-
gated nuclei and are characterized by drastic decrease
of cross-section in the region of continuum with in-
crease of scattering angle. At angle θ = 21◦, cross-
section decreases by about 5 times compared to the
cross-section at angle θ = 16◦. Appearance of wide
maximum in the region of high excitation energies
is a characteristic feature of spectra at small angles.
With increase of scattering angle, maximum becomes
less evident. In the spectra of deuterons at angles
θ = 36◦ and 47◦, structural peculiarities are no longer
observed.
Analysis of inclusive spectra of deuterons on tar-
gets 12C, 48Ti, and 58,64Ni at scattering angles of
16◦ ≤ θ ≤ 61◦ has shown that it is expedient to in-
vestigate excitation of high states only at scattering
angles θ < 21◦. Therefore, later on, we will pay ma-
jor attention to analysis of energy spectra, obtained
at angle θ = 16◦.
In Fig.1,c, energy spectra of deuterons, measured
at scattering angle θ = 16◦ on 12C, 48Ti, and 58,64Ni
nuclei in wide excitation energy range (beginning
from 5MeV ) are shown; and in Fig.1, d – these spec-
tra in the region of continuum. As it is seen from
Fig.1, for all nuclei investigated, increase of cross-
section in continuum is observed. For nuclei with
medium atomic weight, increase of cross-section in
continuum may be characterized as ”structured maxi-
mum”, width and position of which practically do not
change in the given range of atomic masses. Region
of continuum is separated with ”dip” from the field
of excitation of discrete states.
In spectrum of deuterons, inelastically scattered
on titanium nuclei, structural peculiarities are fee-
bly marked. Only increase of cross-section at exci-
tation energies of ∼ 16 − 20 MeV and ∼ 26 MeV
could be noted. Maximum has slight slope both
to the range of low excitation energies and to the
range of high energies. On nickel isotopes, struc-
tural peculiarities in the range of excitation energies
of ∼ 16 − 18 MeV and ∼ 22 − 26 MeV are mani-
14
fested more evidently. ”Structured maximum” is bi-
furcated. Essential discrepancy in cross-sections be-
tween titanium and nickel isotopes is observed in the
range of excitation energies 17−23 MeV . The differ-
ence is about 20−25%. One of the reasons of discrep-
ancy can be more drastic angle dependence of cross-
sections on nickel isotopes, than on titanium. Mea-
surements on titanium and nickel isotopes were car-
ried out at different values of parameters of deuteron
beam, therefore, we consider the experimental data
as preliminary results.
Another peculiarity of observed energy spectra is
discrepancy in values of cross-sections on nickel iso-
topes in the range of excitation energies 15−20 MeV .
Cross-sections in this energy range on 64Ni are by
15% more than on 58Ni. In this case, difference in
cross-sections is not related to experimental accuracy
and is a consequence of isotopic difference.
In energy spectrum of inelastically scattered
deuterons on 12C nucleus, decrease of excitation
cross-section of high states is observed. Nevertheless,
in spite of evident increase of cross-section in contin-
uum, maximums are observed in the range of exci-
tation energies ∼ 16− 18 MeV and ∼ 24− 26 MeV .
It is possible that their origin has common nature
with increase of cross-section on nuclei with medium
atomic weight, being observed in the same region.
Narrow maximum at excitation energies of ∼
11 MeV apparently belongs to the excitation of group
of discrete states.
3. THEORETICAL ANALYSIS
Differential cross-section for inelastic deuteron scat-
tering per unit spatial angle and unit final deuteron
energy E′
d in nonrelativistic approximation after sum-
ming over all final nucleus states in diffraction ap-
proximation [6, 7] can be written in the following
form:
dσ
dE′
ddΩd
=
√
E′
d
Ed
1
D
|fd (~q)|2 N1, ~q = ~kd − ~k′d, (1)
where D ≡ D(U) is the distance between neighboring
nucleus levels with excitation energy U = Ed − E′
d
(Landau formulae was used to find D); fd(~q) is an
amplitude of quasielastic scattering of deuteron by
a single nucleon of a nucleus; ~kd and ~k′d are ini-
tial and final deuteron momenta respectively; N1 is
an effective number of nucleons, which scatter in-
coming deuterons, at the periphery of target nucleus
(N1 ¿ A, where A is the nucleus mass number).
The cross-section (1) is written in the approximation
of smallness of the nucleon-nucleon interaction radius
as compared with the size of scattering nucleus, ne-
glecting the contribution of multiple scattering and
correlations between nucleons in the target nucleus.
Formulae (1) is the generalization of the correspond-
ing expression for the cross-section given in [6, 7].
By choosing the Gaussian expressions for
deuteron wave function
ϕd (r) = Nse
− 1
2 µr2
, Ns =
(µ
π
) 3
4
,
µ = 0.143 fm−2 (2)
and nucleon-nucleon profile functions
ωN (ρN ) = ae−b2ρ2
N , N = n, p (3)
(ρN is an impact NN parameter), the amplitude fd(~q)
in (1) can be expressed in explicit form:
fd (~q) = ikd
π
3
2 a
b2õ
N2
s
{
1
µ
exp
[
−
(
1
16µ
+
1
4b2
)
q2
]
−
− a
4
(
1
2b2 + µ
) exp
(
− q2
8b2
)}
. (4)
It follows from (4) that the total cross-section of
deuteron-nucleon interaction has the following form:
σd =
4π
kd
Imfd(0) =
=
π
5
2 N2
s
b2õ
[
4Rea
µ
+
(Ima)2 − (Rea)2
1
2b2 + µ
]
. (5)
For multi-nucleon spherical nucleus with radius R
and constant nucleon density ρ(~r) = ρ0 = 3A
4πR3 for
the N1 in (1) we can obtain the following expression:
N1 =
π
ρ2
0σ
3
d
[
1− (
2ρ2
0σ
2
dR2 + 2ρ0σdR + 1
)×
× exp (−2ρ0σdR)] . (6)
Parameters of NN-interaction a and b, entering
(3) - (5), are taken from [8, 9, 10], where they were
obtained from experimental data:
Re a = 2.65, Im a = −1.95, b2 = 0.30 fm−2. (7)
In order to find the total cross-section σt of inter-
action between deuterons and target nuclei, we use
the optical theorem and stepped nucleon-nucleus pro-
file functions
ωn(ρ) = ωp(ρ) = θ(R− ρ), (8)
where θ(R−ρ) is the Heaviside function. In this case
σt = 2πR2
{
1 + exp
(−2µR2
)×
× [
I0
(
2µR2
)
+ I1
(
2µR2
)]}
, (9)
where I0(2µR2) and I1(2µR2) are modified Bessel
functions [11]. In our case, the total cross-section
σt in barns equals to 0.7, 1.6, 1.8, 1.9 for 12C, 48Ti,
58,64Ni respectively.
Since theoretical cross-section was summed over
all final nucleus states, it can not describe all details
of the cross-section in the range of observed broad
maximum at excitation energies 12− 30 MeV . How-
ever, at small scattering angles of deuterons in our
experiment, for 12C and especially for 58,64Ni, the
two-hump fine structure of the broad maximum (see
Fig.1) can be observed. It could correspond to the
excitation of the quadrupole giant resonance at lower
15
10 15 20 25 30 35
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
d2 σ/
dΩ
dU
(m
b/
sr
.M
eV
)
U (MeV)
48Ti θ
= 160
10 15 20 25 30 35
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
d2 σ/
dΩ
dU
(m
b/
sr
.M
eV
)
U (MeV)
64Ni θ
= 160
Fig.2. a – calculated cross-section vs. excitation energy for 48Ti at 16◦; b – the same for 64Ni at 16◦
energies, and the dipole giant resonance at higher en-
ergies [12]. It is also possible that the first of two
humps is related to the energy transfer to the periph-
eral nucleons of a nucleus, whereas the second hump
– to nucleons of the internal 1s-shell.
The cross-section of the processes with excitation
of discrete nucleus levels (between the elastic scat-
tering peak and the broad maximum) with energy U
was calculated according to the following formulae:
dσu
dE′
ddΩd
=
√
E′
d
Ed
∣∣∣fd
(
~kd − ~k′d
)∣∣∣
2
δ (Ed − E′
d − U) ,
(10)
where δ-function was replaced by the finite multiplier
δ∆ (Ed −E′
d − U) =
1√
π∆2
×
× exp
(
− 1
∆2
(Ed − E′
d − U)2
)
(11)
(the parameter ∆ defines errors in measuring the en-
ergy). The same formulas (10) and (11) were used to
calculate the cross-section of elastic deuteron scatter-
ing (at U = 0).
The results of our calculations of the cross-section
(1) for 48Ti and 64Ni nuclei in the region of the con-
tinuum are presented in Fig.2. We have reached quite
good agreement of our calculations with the experi-
mental data in the whole region of continuum except
its central part (around 20 MeV ). The discrepancy in
that region is rather significant for 64Ni (see Fig.2,b),
because of the two-hump structure of the maximum.
Though the data for 48Ti do not show the same struc-
ture of the maximum (see Fig.2,a), we believe that
the same physical effects as for 64Ni contribute here.
4. CONCLUSIONS
In this work we have studied experimentally the
scattering of deuterons by 12C, 48Ti, 58,64Ni nuclei
and found the existence of the continuum region in
the differential cross-sections at angle θ < 21◦. Ex-
perimental data show that the broad maximum of the
cross-section in the continuum region has fine struc-
ture. For 12C and 58,64Ni this structure has a shape
of two humps.
We believe that the fine structure of the broad
maximum is related to the excitation of the giant
resonances in the target nuclei. As it was explained
above, our preliminary formulae do not take the ef-
fects, leading to the hump-like structure of the maxi-
mum, into account. Nevertheless, the formulae allow
us to describe the data in all but central parts of the
continuum quite well. We plan to take the contri-
butions of the giant resonances into account in our
further work. This will allow us to improve our de-
scription of the fine structure of the broad maximum.
Our experimental and theoretical study of the fine
structure of the deuteron-nucleus cross-section in the
continuum region will be continued in the future.
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1. E.P. Kadkin, S.N. Kondratiev, L.S. Saltikov et
al. // Yad.Fiz. 1998, v.61, N9, p.1459-1471 (in
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7. A.G. Sitenko. Theory of Nuclear Reactions. M.:
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ВОЗБУЖДЕНИЕ СРЕДНИХ ЯДЕР В ОБЛАСТИ КОНТИНУУМА ПРИ
НЕУПРУГОМ РАССЕЯНИИ ДЕЙТРОНОВ
В.И. Гранцев, В.В. Давидовский, К.К. Кисурин, С.Е. Омельчук, Г.П. Палкин,
Ю.С. Рознюк, Б.А. Руденко, В.С. Семенов, Л.И. Слюсаренко, Б.Г. Стружко,
В.К. Тартаковский, В.А. Шитюк
Выполнены эксперименты по упругому и неупругому рассеянию дейтронов ядрами 12C, 48Ti, 58,64Ni
при энергии 37 МэВ на углы от 16◦ до 61◦ на изохронном циклотроне У-240 Института ядерных иссле-
дований НАН Украины. В энергетическом спектре рассеянных дейтронов для углов рассеяния меньше
21◦ наблюдается широкий максимум при энергиях возбуждения ядер от 12 до 30 МэВ, включающий в
себя максимум гигантского резонанса. Широкий максимум был описан теоретически в дифракционном
приближении после суммирования сечения по всем конечным ядерным состояниям.
ЗБУДЖЕННЯ СЕРЕДНIХ ЯДЕР В ОБЛАСТI КОНТИНУУМА ПРИ
НЕПРУЖНОМУ РОЗСIЯННI ДЕЙТРОНIВ
В.I. Гранцев, В.В. Давiдовський, К.К. Кiсурiн, С.Є. Омельчук, Г.П. Палкiн,
Ю.С. Рознюк, Б.А. Руденко, В.С. Семенов, Л.I. Слюсаренко, Б.Г. Стружко,
В.К. Тартаковський, В.А. Шитюк
Виконано експерименти з пружного та непружного розсiяння дейтронiв ядрами 12C, 48Ti, 58,64Ni
при енергiї 37 МеВ на кути вiд 16◦ до 61◦ на iзохронному циклотронi У-240 Iнституту ядерних до-
слiджень НАН України. В енергетичному спектрi розсiяних дейтронiв для кутiв розсiяння менше 21◦
спостерiгається широкий максимум при енергiях збудження ядер вiд 12 до 30 МеВ, який включає в
себе максимум гiгантського резонансу. Широкий максимум було описано теоретично в дифракцiйному
наближеннi пiсля пiдсумовування перерiзу за всiма кiнцевими ядерними станами.
17
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