Threshold Photoneutron Angular Distributions and an M1 Giant Resonance in 208Pb

1975 ◽  
Vol 53 (15) ◽  
pp. 1422-1433 ◽  
Author(s):  
L. C. Haacke ◽  
K. G. McNeill
Keyword(s):  
Giant Resonance ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Neutron Shell ◽  
Spin Flip ◽  
Proton Shell

Threshold photoneutron time-of-flight spectra from the 208Pb(γ,n)207Pb reaction have been measured at five angles to the incident photons. Angular distributions obtained for 14 resonances within 850 keV of the 208Pb(γ,n) threshold have led to assignments of M1 strength totalling 67.5 ± 12 eV. The total M1 strength available from spin-flip transitions from the i13/2 neutron shell and the h11/2 proton shell has been calculated to be 100 eV (Weiss). Thus, the data confirm the existence of an M1 giant resonance just above threshold in 208Pb.

A time‐of‐flight spectrometer for the measurement of angular distributions of scattered slow positrons and electrons

1980 ◽  
Vol 51 (7) ◽  
pp. 935-943 ◽  
Author(s):  
P. G. Coleman ◽  
J. D. McNutt ◽  
J. T. Hutton ◽  
L. M. Diana ◽  
J. L. Fry
Keyword(s):  
Time Of Flight ◽  
Angular Distributions

Absolute (γ, p0) and (γ, p1) cross sections and angular distributions for the closed-neutron shell nucleusY89

1980 ◽  
Vol 22 (6) ◽  
pp. 2396-2403 ◽  
Author(s):  
E. Van Camp ◽  
R. Van de Vyver ◽  
H. Ferdinande ◽  
E. Kerkhove ◽  
R. Carchon ◽  
...  
Keyword(s):  
Cross Sections ◽  
Angular Distributions ◽  
Neutron Shell ◽  
Closed Neutron Shell

Spin-flip measurements in the proton inelastic scattering on 12C and giant resonance effects

1975 ◽  
Vol 254 (1) ◽  
pp. 156-168 ◽  
Author(s):  
R. De Leo ◽  
G. D′erasmo ◽  
F. Ferrero ◽  
A. Pantaleo ◽  
M. Pignanelli
Keyword(s):  
Inelastic Scattering ◽  
Giant Resonance ◽  
Resonance Effects ◽  
Proton Inelastic Scattering ◽  
Spin Flip

Nanosecond and Femtosecond UV Laser Ablation of CdTe (100): Time-Of-Flight and Angular Distributions

1993 ◽  
Vol 334 ◽  
Author(s):  
P.D. Brewer ◽  
M. Späth ◽  
M. Stuke
Keyword(s):  
Laser Ablation ◽  
High Resolution ◽  
Mass Spectrometer ◽  
Multiphoton Ionization ◽  
Time Of Flight ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Dye Laser ◽  
Angular Distributions ◽  
Uv Laser

AbstractAngularly resolved time-of-flight (TOF) measurements have been used to probe the velocity and angular distributions of Cd atoms and Te2 molecules ejected from CdTe (100) substrates under irradiation by 248 nm nanosecond and sub-picosecond laser pulses. These experiments employ a dye laser TOF mass spectrometer with resonance enhanced multiphoton ionization for sensitive, high resolution detection of the desorbed products. The velocity distributions are well described by Maxwell-Boltzmann distributions for low fluence nanosecond (<60 mJ/cm2) and sub-picosecond (<3.3 mJ/cm2) pulses. Angular flux distributions for nanosecond irradiation are observed to be highly forward peaked about the surface normal, whereas, for sub-picosecond irradiation the distribution approaches cos3θ.

Neutron Spin-Flip in the Reaction 12C(n,n′)12C*(4.44MeV) at 15.0 MeV

1973 ◽  
Vol 28 (7) ◽  
pp. 1223-1225 ◽  
Author(s):  
M. Thumm ◽  
G. Mertens ◽  
G. Mack
Keyword(s):  
Inelastic Scattering ◽  
Plastic Scintillator ◽  
Time Of Flight ◽  
Neutron Spin ◽  
Spin Flip ◽  
Γ Rays ◽  
Scattered Neutrons

The spin-flip probability S(θ) in the inelastic scattering of unpolarized 15.0-MeV neutrons to the first 2+ state in 12C has been determined at θ = 140° (lab.) by measuring the scattered neutrons in coincidence with the subsequent 4.44- MeV deexcitation γ-rays emitted normal to the scattering plane. Time-of-flight technique with carbon recoil detection in a plastic scintillator has been used. The neutron spin-flip probability is S = 0.21±0.06.

Spectroscopic Study of 32S Through the 31P(d,n)32S Reaction

1974 ◽  
Vol 52 (14) ◽  
pp. 1288-1294 ◽  
Author(s):  
A. H. Hussein ◽  
G. C. Neilson ◽  
W. J. McDonald ◽  
W. K. Dawson
Keyword(s):  
Spectroscopic Study ◽  
Shell Model ◽  
Cross Sections ◽  
Differential Cross ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Absolute Differential ◽  
Spectroscopic Factors ◽  
Model Predictions ◽  
Theoretical Predictions

The 31P(d,n)32S reaction has been studied at deuteron energies of 4.0 and 5.45 MeV. Neutron energies were measured by time of flight. Absolute differential cross sections of seven levels in 32S have been measured and compared with the theoretical predictions of both the DWBA and compound statistical theories. Analysis of the angular distributions yielded lP values and absolute spectroscopic factors. These results have been compared with those from other experiments and shell model predictions.

Inelastic scattering of slow positrons by helium, neon, and argon atoms

1982 ◽  
Vol 60 (4) ◽  
pp. 584-590 ◽  
Author(s):  
P. G. Coleman ◽  
J. T. Hutton ◽  
D. R. Cook ◽  
C. A. Chandler
Keyword(s):  
Energy Loss ◽  
Inelastic Scattering ◽  
Multiple Scattering ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Atomic Excitation ◽  
Helium Neon

Measurements of the excitation and ionization of helium, neon, and argon by positrons of energies between threshold and 50 eV, utilising time-of-flight energy loss spectrometry, are reported. Scattering into forward angles up to 60° is observed and the measurements suggest that sharp forward lobes exist in the angular distributions of positrons scattered following atomic excitation. Multiple scattering corrections to the measurements are described. Comparison is made with the inelastic scattering of electrons by the same atoms, and connections drawn between the present results and those of the recent complementary studies of Griffith et al. and Charlton et al.

Proton spin flip at 12 MeV for nuclei near the neutron shell closure, N = 28

1973 ◽  
Vol 210 (3) ◽  
pp. 557-567 ◽  
Author(s):  
J.L. Ellis ◽  
E.V. Hungerford ◽  
W.E. Sweeney
Keyword(s):  
Proton Spin ◽  
Shell Closure ◽  
Neutron Shell ◽  
Spin Flip ◽  
Neutron Shell Closure

Measurements of Neutron Polarizations for Deuteron Energies from 0.87 to 5.00 MeV

1972 ◽  
Vol 50 (8) ◽  
pp. 783-790 ◽  
Author(s):  
J. R. Smith ◽  
S. T. Thornton
Keyword(s):  
Energy Range ◽  
Liquid Helium ◽  
Legendre Polynomial ◽  
Measurement Techniques ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Contour Maps ◽  
Neutron Time ◽  
Polarized Neutron ◽  
Polynomial Expansions

Neutron time-of-flight techniques have been used to measure [Formula: see text] polarization angular distributions for several deuteron energies from 0.87 to 5.00 MeV. Liquid helium served as the polarized neutron analyzer. From Legendre polynomial expansions of σ(Θ) and P(Θ)σ(Θ), contour maps of P(Θ) and P2(Θ)σ(Θ) have been produced for the energy range 0.87 to 5.00 MeV. Comparison with previous results and measurement techniques are discussed. Nucleon polarizations from the charge symmetric reactions [Formula: see text] and [Formula: see text] are compared.

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