Coulomb excitation of 24Mg with 35Cl ions

1969 ◽  
Vol 47 (18) ◽  
pp. 1929-1940 ◽  
Author(s):  
D. Pelte ◽  
O. Häusser ◽  
T. K. Alexander ◽  
H. C. Evans
Keyword(s):  
Quadrupole Moment ◽  
Cross Section ◽  
Ground State ◽  
State Transition ◽  
Gamma Ray ◽  
Coulomb Excitation ◽  
Absolute Cross Section ◽  
Ground State Transition ◽  
Section Measurement ◽  
Anisotropy Measurement

The Coulomb excitation of a thick 24Mg target was studied with 35Cl ions of 61, 57, and 52 MeV. The absolute cross section and the anisotropy of the angular distribution of the ground state transition from the 1.369-MeV state in 24Mg was measured, and their dependence on B(E2) and the quadrupole moment, Q, of the 1.369-MeV state was calculated. A B(E2) of 24.5 ± 2.2 Weisskopf units (W.u.) was deduced from the line shape of the 1.369-MeV gamma ray observed with a 40 cm3 Ge(Li) detector. The quadrupole moment determined from the anisotropy measurement was Q = −0.38 ± 0.16 b. From the cross-section measurement, Q = −0.47 ± 0.19 b was obtained using B(E2) = 24.5 ± 2.2 W.u. The dependence of this value of Q on B(E2) is discussed.

THE CROSS SECTION FOR THE Ni58(n, α)Fe55 GROUND-STATE TRANSITION

1963 ◽  
Vol 41 (3) ◽  
pp. 545-546 ◽  
Author(s):  
W. G. Slinn ◽  
J. M. Robson
Keyword(s):  
Cross Section ◽  
Ground State ◽  
State Transition ◽  
Ground State Transition ◽  
The Cross

PROPERTIES OF LEVELS AT 6.69 AND 6.88–6.89 MeV IN 28Si

1966 ◽  
Vol 44 (5) ◽  
pp. 1087-1097 ◽  
Author(s):  
R. J. A. Levesque ◽  
R. W. Ollerhead ◽  
E. W. Blackmore ◽  
J. A. Kuehner
Keyword(s):  
Excited State ◽  
Alpha Particle ◽  
Ground State ◽  
State Transition ◽  
Gamma Ray ◽  
The Other ◽  
Ground State Transition ◽  
Angular Correlations ◽  
First Excited State ◽  
Strong Ground

Levels at 6.69, 6.88, and 6.89 MeV were observed in the 16O(16O, α)28Si reaction, and angular correlations were measured for the resulting gamma-ray transitions, using the geometry in which the alpha particle is detected at 0°. The level at 6.69 MeV had not been reported previously and was assigned spin and parity 0+. The doublet of levels at 6.88–6.89 MeV was not resolved in these measurements, but angular correlations of the gamma-ray transitions were possible, using spectrum subtraction techniques. One member of the doublet, previously assigned spin 3, has a strong ground-state transition; the angular correlation for this transition confirms a 3− assignment to this level. The other member of the doublet, which decays almost entirely to the first excited state, could not be assigned a spin on the basis of these measurements. However, taken in conjunction with other measurements, an assignment of 4+ is favored.

Capture Gamma-Ray Spectra for the 59Co(n, γ)60Co Reaction Using Resonance Energy Neutrons

1975 ◽  
Vol 53 (4) ◽  
pp. 351-359 ◽  
Author(s):  
W. V. Prestwich ◽  
A. M. Lopez
Keyword(s):  
Neutron Energy ◽  
Ground State ◽  
State Transition ◽  
Gamma Ray ◽  
Resonance Energy ◽  
High Energy ◽  
Final States ◽  
Ground State Transition ◽  
Energy Distributions ◽  
Direct Capture

Capture gamma-ray spectra for the reaction 59Co(n, γ)60Co were obtained for different neutron energy distributions. Significant contributions from the high energy resonances were observed. Analysis of the data for the ground state transition indicates that the contribution to the process from potential direct capture is substantially smaller than previous estimates. No retardation of transitions to final states exhibiting an ln = 3 (d,p) stripping pattern, such as that observed for 132 eV capture, is evident for the higher energy resonances.

scholarly journals Reduction in the uncertainty of the neutron-capture cross section of 210Bi: Impact of a precise multipolarity measurement of the 2− → 1− main ground-state transition

2017 ◽  
Vol 146 ◽  
pp. 10011
Author(s):  
Natalia Cieplicka-Oryńczak ◽  
Silvia Leoni ◽  
Bogdan Fornal ◽  
Dino Bazzacco ◽  
Aurelien Blanc ◽  
...  
Keyword(s):  
Cross Section ◽  
Ground State ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
State Transition ◽  
Capture Cross ◽  
Ground State Transition ◽  
Neutron Capture Cross Section

Coulomb excitation of 35Cl projectiles

1969 ◽  
Vol 47 (10) ◽  
pp. 1065-1075 ◽  
Author(s):  
O. Häusser ◽  
D. Pelte ◽  
T. K. Alexander ◽  
H. C. Evans
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Coulomb Excitation ◽  
Coupling Model ◽  
Absolute Cross Section ◽  
Mixing Ratio ◽  
Lineshape Analysis ◽  
Doppler Shift Attenuation

Coulomb excitation of the first two excited states in 35Cl was studied by bombarding thick foils of 24Mg and carbon with 35Cl ions of energies between 51 and 61 MeV. De-excitation gamma rays were observed in two 40 cm3 Ge(Li) detectors. From absolute cross-section measurements the following B(E2) values were obtained, B(E2, 0 → 1220) = (0.081 ± 0.009) × 10−50 e2 cm4 and B(E2, 0 → 1762) = (1.17 ± 0.09) × 10−50 e2 cm4. The mixing ratio δ(1762 → 0) was measured to be −2.95 ± 0.45 which can be combined with the corresponding B(E2) value to yield τ(1762) = (0.555 ± 0.050) ps. A Doppler shift attenuation method was employed to interpret the observed gamma-ray lineshapes in terms of nuclear lifetimes. The lineshape analysis yielded τ(1220) = (0.16 ± 0.05) ps and confirmed τ(1762) obtained from the absolute cross-section measurements. The results provide evidence that the three lowest states in 35Cl cannot be interpreted by a weak coupling model.

E3 Coulomb excitation of 19F

1969 ◽  
Vol 47 (21) ◽  
pp. 2335-2342 ◽  
Author(s):  
T. K. Alexander ◽  
O. Häusser ◽  
K. W. Allen ◽  
A. E. Litherland
Keyword(s):  
Cross Section ◽  
Ground State ◽  
Gamma Ray ◽  
Excitation Cross Section ◽  
Coulomb Excitation ◽  
Thick Target ◽  
Transition Strength ◽  
Average Value ◽  
Target Yield ◽  
Model Predictions

The E3 matrix element connecting the ground state with the 5/2−, 1346-keV level in 19F has been measured by projectile excitation of a 19F beam and observation of the 1236-keV de-excitation gamma ray in Ge(Li) detectors. The thick-target yield of the 1236-keV gamma ray was 1.6, 6.0, 9.8, and 23 gammas per 1010 projectiles at bombarding energies of 22, 25, 26, and 28 MeV, respectively. The average value of the strength of the E3 transition deduced from these measurements is [Formula: see text] In addition, the E2 Coulomb-excitation cross section of the 1554-keV level was measured and the reduced transition strength of the E2 transition from the 1554-keV level to the ground state was found to be 6.8 ± 0.7 W.u. Comparisons are made with model predictions.

Coulomb excitation of rotational states and ground-state quadrupole moment forAm243

1981 ◽  
Vol 24 (6) ◽  
pp. 2723-2726 ◽  
Author(s):  
C. E. Bemis ◽  
F. K. McGowan ◽  
J. L. Ford ◽  
W. T. Milner ◽  
R. L. Robinson ◽  
...  
Keyword(s):  
Quadrupole Moment ◽  
Ground State ◽  
Coulomb Excitation ◽  
Rotational States

scholarly journals Laser spectroscopy of the 1001-nm ground-state transition in dysprosium

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
D. Studer ◽  
L. Maske ◽  
P. Windpassinger ◽  
K. Wendt
Keyword(s):  
Laser Spectroscopy ◽  
Ground State ◽  
State Transition ◽  
Ground State Transition

scholarly journals Attempted study of the 237Np(n,2n)236Np reaction cross section at 9.5 MeV

2019 ◽  
Vol 18 ◽  
pp. 101
Author(s):  
M. Diakaki ◽  
R. Vlastou ◽  
M. Kokkoris ◽  
C. T. Papadopoulos ◽  
A. Tsinganis ◽  
...  
Keyword(s):  
Cross Section ◽  
Gamma Ray ◽  
Gamma Spectroscopy ◽  
Reaction Cross ◽  
Activation Technique ◽  
Incident Neutron ◽  
Incident Neutron Energy ◽  
Tandem Accelerator ◽  
Section Measurement ◽  
High Gamma

The cross section measurement of the 237Np(n,2n)236Np reaction has been attempted at an incident neutron energy of 9.5 MeV by means of the activation technique. The neutron beam was produced via the 2H(d,n)3Ηe reaction at the VdG Tandem accelerator of NCSR “Demokritos”. It is the second time that this measurement has been tried with a gamma spectroscopy method and the difficulties faced due to the high gamma ray background produced by the sample itself and the fission fragments produced by the irradiation, in combination with the very low intensity of the gamma ray of interest are being reported.

scholarly journals Photoionisation Cross Sections of Chlorine Atoms and Molecules at 584 Å

1986 ◽  
Vol 39 (5) ◽  
pp. 779 ◽  
Author(s):  
WJ van der Meer ◽  
RJ Butselaar ◽  
CA de Lange
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Modulation Method ◽  
Absolute Cross Section ◽  
Molecular Chlorine ◽  
Chlorine Atoms ◽  
Atoms And Molecules ◽  
Ionic States ◽  
State Ionic

A recently developed modulation method is used to obtain cross sections for the photoionisation of ground state neutral to ground state ionic, atomic and molecular chlorine relative to that of the HCl + (X2n 1IZ,3IZ) +-- HCl(XI ~ +) transition at the He Ia wavelength. With the known absolute cross section of the latter process, determined by (e,2e) coincidence spectroscopy, the present ell,periments provide absolute photoionisation cross sections of the CI + epz,l,o) +-- Clep) and Cli (XZ n g, 1IZ,3 IZ) +-- Clz (X I ~ t) transitions. Relative cross sections, previously determined for the transitions to the additional Cl and Clz ionic states accessible with He Ia radiation, are used to obtain absolute cross sections for the Cl+(IDz, ISO) +-- Clep) and Cli(AZnu,1IZ,3IZ, BZ~t) +-- Clz(XI~t) ionisation processes.

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