Study of 16O, 20Ne, 22Ne, 28Si and 32S by inelastic scattering of polarized protons

doi:10.1016/0375-9474(76)90044-0

Nuclear Physics A

Volume 261, Issue 1, 19 April 1976, Pages 111-129

https://doi.org/10.1016/0375-9474(76)90044-0 Get rights and content

Abstract

Analyzing powers and cross sections have been measured for elastic and inelastic scattering of 24.5 MeV protons from ²⁰Ne and ²²Ne, and for ¹⁶O, ²⁸Si and ³²S at 30.3 MeV. The experimental results were analyzed in terms of the coupled-channels formalism using the rotational model and (for ³²S and ¹⁶O) the vibrational model. The results for ²⁰Ne, ²²Ne and ²⁸Si show a systematic trend of the hexadecapole deformation. Prolate shapes for ²⁰Ne and ²²Ne and an oblate shape for ²⁸Si are confirmed. The results for ³²S are almost equally well-reproduced by the vibrational or rotational model, and there is a slight preference for the prolate shape for this nucleus. The best fits for the analyzing power for all the nuclei were obtained by using the full Thomas form for the spin-orbit potential

References (45)

J. Lowe
Nucl. Phys.
(1971)
H. Sherif et al.
Nucl. Phys.
(1970)
J. Raynal
K.W. Kemper et al.
Phys. Rev.
(1971)
R. de Swiniarski et al.
Bull. Am. Phys. Soc.
(1969)
D.J. Clark et al.
H.E. Gove
University of Rochester Report UR.NSRL-7
(1968)
S. Das Gupta et al.
Nucl. Phys.
(1967)
B. Castel et al.
Nucl. Phys.
(1969)
C. Brihaye et al.
Nucl. Phys.
(1967)
H.G. Benson et al.
Nucl. Phys.
(1969)
M.K. Pal et al.
Phys. Rev.
(1967)
D.K. Olsen et al.
Phys Rev.
(1973)

J. Raynal, private...

M.M. Aleonard et al.

Nucl. Phys.

(1970)

M.C. Mermaz et al.

Phys. Rev.

(1969)

J.P. Thibaud et al.

Nucl. Phys.

(1969)

G.W. Schweimer et al.

Phys. Lett.

(1972)

G.R. Satchler

C. Glashausser et al.

Adv. in Nucl. Phys.

(1969)

J.L. Escudié et al.

Polarization phenomena in nuclear reactions

P.D. Greaves et al.

Polarization phenomena in nuclear reactions

P.D. Greaves et al.

Nucl. Phys.

(1972)

R. de Swiniarski et al.

Phys. Rev. Lett.

(1972)

R. de Swiniarski et al.

Phys. Rev. Lett.

(1969)

Cited by (46)

Nuclear Data Sheets for A = 22
2015, Nuclear Data Sheets
Nuclear Data Sheets for A = 22
2005, Nuclear Data Sheets
This evaluation of $A = 22$ has been updated from previous evaluations published in 1998En04, 1990En08, and 1978En02. Coverage includes properties of adopted levels and γ rays, decay-scheme data (energies, intensities and placement of radiations), and cross reference entries. The following tables continue the tradition of showing the systematic relationships between levels in $A = 22$ . These assignments are based on spectroscopic factors and energy differences where $Δ E_{x} = E_{x} ({}^{22}{Na}) - E_{x} ({}^{22}{Ne}) - 657.16$ or $Δ E_{x} = E_{x} ({}^{22}{Mg}) - E_{x} ({}^{22}{Ne})$ .
Reduced electric-octupole transition probabilities, B(E3;0<inf>1</inf>+ → 3<inf>1</inf>-) - An update
2002, Atomic Data and Nuclear Data Tables
A previous compilation of excitation energies E_x (3₁⁻) and reduced electric-octupole transition probabilities B(E3;0₁⁺→3₁⁻) for first 3⁻ states of even-even nuclides, which covered the literature to March 1988, has been updated to cover the literature to the end of 2000. Data obtained from various experimental procedures are tabulated. The final table presents adopted values of B(E3;0₁⁺→3₁⁻), together with the E3 transition strengths |M(E3)|² in Weisskopf units. Plots of |M(E3)|² versus mass number A, atomic number Z, and neutron number N confirm the existence of structure suggested in the earlier work.
The 16O(p,p′) reaction at 35 MeV
1990, Nuclear Physics, Section A
The ¹⁶O( $p, p ′$ ) reaction was studied with a 35 MeV polarized proton beam. The cross sections and analyzing powers for excited states in ¹⁶O up to and including the 2⁻, T = 1 state at 12.97 MeV were measured and compared with DWBA calculations. Both density-independent and densitydependent effective interactions were used in the calculations. Transition densities calculated using shell-model amplitudes and Woods-Saxon single-particle wave functions give poor accounts of the data. The use of macroscopic transition densities obtained from electron scattering data give a much better description of the data, especially when used in combination with the densitydependent interaction.
Neutron elastic and inelastic scattering from Mg, Si, S, Ca, Cr, Fe and Ni AT E<inf>n</inf> = 21.6 MeV
1990, Nuclear Physics, Section A
The Studsvik high-resolution, low-background time-of-flight facility has been used to measure differential neutron elastic and inelastic scattering cross sections for Mg, Si, S, Ca, Cr, Fe and Ni at the neutron energy 21.6 MeV. The results have been analysed in terms of collective rotational, vibrational or rotation-vibrational models using the coupled-channels formalism. Optical model potential depths and geometrical parameters as well as nuclear deformation parameters were determined from fits to the measured data.
Neutron elastic and inelastic scattering from beryllium, nitrogen and oxygen at E<inf>n</inf> = 21.6 MeV
1990, Nuclear Physics, Section A
The Studsvik high-resolution, low-background time-of-flight facility has been used to measure differential neutron-scattering cross sections for ⁹Be, ¹⁴N and ¹⁶O at the neutron energy 21.6 MeV. Angular distributions in the range 10°–160° have been measured for elastic scattering, and also for inelastic scattering from some low-lying levels in the three nuclei.
The results for elastic scattering have been treated in terms of a phenomenological spherical optical model, while inelastic-scattering cross sections for ¹⁴N and ¹⁶O were calculated using the distorted-wave Born approximation. The coupled-channels formalism for rotational and vibrational nuclei was also used in the analysis of scattering from ⁹Be and ¹⁶O, respectively. Potential parameters and deformations from these calculations are given in the paper.

View all citing articles on Scopus

^☆: Work supported under the auspices of the US Atomic Energy Commission.

^††: Present address: Institut des Sciences Nucléaires de Grenoble, France.

^†††: Present address: University of Milan, Italy.

^‡: Present address: Physics Department, University of Indiana, Bloomington, Indiana.

View full text

Article preview

Nuclear Physics A

Abstract

References (45)

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Bull. Am. Phys. Soc.

University of Rochester Report UR.NSRL-7

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys Rev.

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Phys. Lett.

Adv. in Nucl. Phys.

Polarization phenomena in nuclear reactions

Polarization phenomena in nuclear reactions

Nucl. Phys.

Phys. Rev. Lett.

Phys. Rev. Lett.

Cited by (46)

Nuclear Data Sheets for A = 22

Nuclear Data Sheets for A = 22

Reduced electric-octupole transition probabilities, B(E3;0<inf>1</inf><sup>+</sup> → 3<inf>1</inf><sup>-</sup>) - An update

The <sup>16</sup>O(p,p′) reaction at 35 MeV

Neutron elastic and inelastic scattering from Mg, Si, S, Ca, Cr, Fe and Ni AT E<inf>n</inf> = 21.6 MeV

Neutron elastic and inelastic scattering from beryllium, nitrogen and oxygen at E<inf>n</inf> = 21.6 MeV

Study of 16O, 20Ne, 22Ne, 28Si and 32S by inelastic scattering of polarized protons☆

Abstract

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Bull. Am. Phys. Soc.

University of Rochester Report UR.NSRL-7

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys Rev.

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Phys. Lett.

Adv. in Nucl. Phys.

Polarization phenomena in nuclear reactions

Polarization phenomena in nuclear reactions

Nucl. Phys.

Phys. Rev. Lett.

Phys. Rev. Lett.

Study of ¹⁶O, ²⁰Ne, ²²Ne, ²⁸Si and ³²S by inelastic scattering of polarized protons☆