Spin–Parity Combinations in 22Ne

1971 ◽  
Vol 49 (5) ◽  
pp. 594-600 ◽  
Author(s):  
R. W. Ollerhead ◽  
G. F. R. Allen ◽  
A. M. Baxter ◽  
B. W. J. Gillespie ◽  
J. A. Kuehner
Keyword(s):  
Band Structure ◽  
Alpha Particles ◽  
Energy Spectra ◽  
Spin Parity ◽  
Unnatural Parity ◽  
Natural Parity

Detection of inelastically scattered alpha particles near 180° from the reaction 22Ne(α,α′)22Ne has been used to identify natural parity levels in 22Ne. Energy spectra were recorded for ten incident energies from 16.5–21.0 MeV in steps of 500 keV. Levels at 4.46, 5.52, and 5.92 MeV have been identified as having natural parity, leading to definite assignments of 2+, 4+, and 2+ respectively. Levels at 5.14 and 5.64 MeV have been identified as having unnatural parity, implying assignments of 2− and 3+ respectively. Tentative assignments are suggested for other levels, and the implications of the present assignments with regard to the identification of band structure in 22Ne are discussed.

Spin–Parity Combinations in 18O

1971 ◽  
Vol 49 (20) ◽  
pp. 2589-2598 ◽  
Author(s):  
R. W. Ollerhead ◽  
G. F. R. Allen ◽  
A. M. Baxter ◽  
J. A. Kuehner
Keyword(s):  
Negative Parity ◽  
Alpha Particles ◽  
Energy Spectra ◽  
Excitation Energies ◽  
Spin Parity ◽  
Unnatural Parity ◽  
Parity Band ◽  
Natural Parity ◽  
Negative Parity Band

Detection of inelastically scattered alpha particles near 180° from the reaction 18O(α,α′)18O has been used to identify natural parity levels in 18O. Energy spectra were recorded for 13 incident energies from 20.0 to 23.4 MeV. Levels at 4.45, 5.09, and 5.25 MeV have been identified as having natural parity, confirming earlier assignments of 1−, 3−, and 2+, respectively. Levels at 5.37 and 5.52 MeV have been identified as having unnatural parity leading to definite assignments of 3+ and 2−, respectively. The spin and parity of the 6.18 MeV level has been restricted to 1− or 2+. Other levels at higher excitation energies have been assigned natural parity, and the implications with regard to the identification of a negative parity band in 18O are discussed.

The Energy Band Structure of Polyacene with Soliton Excitation

1997 ◽  
Vol 11 (11) ◽  
pp. 477-483 ◽  
Author(s):  
Z. J. Li ◽  
H. B. Xu ◽  
K. L. Yao
Keyword(s):  
Band Structure ◽  
Charge Density ◽  
Energy Band ◽  
Energy Gap ◽  
Electronic States ◽  
Energy Band Structure ◽  
Energy Spectra ◽  
Energy Band Gap ◽  
The One ◽  
Soliton Excitation

Starting from the extensional Su–Schrieffer–Heeger model taking into account the effects of interchain coupling, we have studied the energy spectra and electronic states of soliton excitation in polyacene. The dimerized displacement u0 is found to be similar to the case of trans-polyacetylene, and equals to 0.04 Å. The energy-band gap is 0.38 eV, in agreement with the results derived by other authors. Two new bound electronic states have been found in the conduction band and in the valence band, which is different from the one of trans-polyacetylene. There exists two degenerate soliton states in the center of energy gap. Furthermore, the distribution of charge density and spin density have been discussed in detail.

Band Structure of Quasi-1-Dimensional Polycondensed π-Systems, 4A)Energy Spectra of a Class of 1-D Ladder Type Polymers

1996 ◽  
Vol 8 (2-3) ◽  
pp. 183-188
Author(s):  
Klaus Müllen ◽  
Markus Müller ◽  
Nikolai Tyutyulkov ◽  
Fritz Dietz
Keyword(s):  
Band Structure ◽  
Energy Spectra

Continuous Energy Spectra of Protons and Alpha Particles Emitted by the Deuteron and Alpha Particle Reaction

1967 ◽  
Vol 22 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Kiyoji Fukunaga ◽  
Hitoshi Nakamura ◽  
Tetsumi Tanabe ◽  
Kazuhiko Hosono ◽  
Seishi Matsuki
Keyword(s):  
Alpha Particle ◽  
Alpha Particles ◽  
Energy Spectra ◽  
Continuous Energy

KET 02: An electron and ion telescope for an interstellar mission

2020 ◽  
Author(s):  
Bernd Heber ◽  
Robert Wimmer-Schweingruber ◽  
Marlon Köberle ◽  
Patrick Kühl ◽  
Stephan Böttcher
Keyword(s):  
Refractive Index ◽  
Galactic Cosmic Rays ◽  
Alpha Particles ◽  
Energy Spectra ◽  
Solar Modulation ◽  
Cherenkov Detector ◽  
Lead Fluoride ◽  
The Earth ◽  
Energy Channels

<p>The recent AMS 02 measurements show that the very local interstellar spectra (VLIS) for galactic cosmic rays cannot be directly measured at the Earth below rigidities of 40-60 GV because of solar modulation. With Voyager 1and Voyager II crossing the heliopause in 2012 and 2018, in situ experimental LIS data below 100 MeV/nuc constrain computed galactic CR spectra. However, the energy spectra in between can so far only be derived by models. This gap could be narrowed by flying an instrument like the The COsmic and Solar Particle INvestigation Kiel Electron Telescope (COSPIN/KET) that measured protons and alpha-particles in the energy range from about 4 to above 2000 MeV/n and electrons in the range up to 10 GeV in distinguished energy channels. Such a telescope would consist of two parts: 1) an entrance telescope of two semiconductors comprising a silica-aerogel Cherenkov detector with a refractive index of 1.066, selecting particles with speeds v/c = b > 0.938, and 2) a calorimeter, a lead-fluoride Cherenkov detector followed by a scintillation detector measuring escaping particles.</p>

scholarly journals Spin?Parity Combinations in 32S

1973 ◽  
Vol 26 (6) ◽  
pp. 747 ◽  
Author(s):  
PR Gardner ◽  
DC Kean ◽  
RH Spear ◽  
AM Baxter ◽  
RAI Bell ◽  
...  
Keyword(s):  
Solid State ◽  
Excitation Energy ◽  
Negative Parity ◽  
Excitation Energies ◽  
Spin Parity ◽  
Magnetic Analysis ◽  
Parity Level ◽  
Natural Parity

Inelastically scattered IX-particles from the reaction 32S(IX, 1X')32S have been studied with solid state counters at extreme backward angles in order to determine spin-parity combinations for levels in 32S at excitation energies Ex up to 7 �15 MeV. The results confirm the well-established spin and parity values, show that the 5� 798 MeV spin 1 state has negative parity, and provide narrow limits for the possible spin and parity values of the 6'410,6' 666,6' 762, and 6� 854 MeV levels. A previously unreported natural parity level was found at Ex = 6�58 MeV. Magnetic analysis of the reaction 32S(p, p')32S confirmed the existence of this level and established its excitation energy as 6�581�0�003 MeV. Particle-y-ray coincidence studies showed that this level decays predominantly by y-ray transitions to the 2�23 MeV 2 + state.

The (K−,π−) and (π+, K+) Reactions and Λ-Hypernuclear Polarization

1994 ◽  
Vol 117 ◽  
pp. 17-53 ◽  
Author(s):  
K. Itonaga ◽  
T. Motoba ◽  
M. Sotona
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Cross Sections ◽  
Ground State ◽  
Weak Decay ◽  
Angular Distributions ◽  
Theoretical Studies ◽  
Excitation Functions ◽  
Unnatural Parity ◽  
Natural Parity

The theoretical studies of (K−, π−) and (π+, K+) reactions on p-shell targets are presented in the DWIA framework with use of the elementary spin-nonflip and spin-flip amplitudes. Calculations can explain the available experimental data of excitation functions and angular distributions of the (K−, π−) reactions at pK−=800 MeV/c and the (π+, K+) reactions at pπ+ = 1.04 GeV/c. Characteristic and distinguished features of the excitation functions and cross sections are exhibited. Especially it is demonstrated that the (K−, π−) reactions at pK−=1.1 GeV/c and 1.5 GeV/c can excite the unnatural parity states with comparable strength to the natural parity ones. Further interesting is that the (π+, K+) and (K−, π−) reactions with ∼1 GeV/c incident beams can be shown to produce very large polarizations of the produced hypernuclear states. Taking the subsequent deexcitation processes of the excited states into account, we have evaluated the hypernuclear polarization and Λ-spin polarization of the ground state and/or the ground-doublet states at the hypernuclear weak-decay stage, which would play a role in the hypernuclear coincidence experiment.

Band structure of quasi-1D polycondensed hydrocarbons II. Energy spectra of ribbon polymers in relation to graphite

1993 ◽  
Vol 53 (2) ◽  
pp. 205-225 ◽  
Author(s):  
Nikolai Tyutyulkov ◽  
Stoyan Karabunarliev ◽  
Klaus Müllen ◽  
Martin Baumgarten
Keyword(s):  
Band Structure ◽  
Energy Spectra
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