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.

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.

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.

ElectromagneticB(E2)transition strengths along the yrast negative-parity band of113I

2003 ◽  
Vol 67 (5) ◽  
Author(s):  
P. Petkov ◽  
A. Dewald ◽  
A. Fitzler ◽  
T. Klug ◽  
G. de Angelis ◽  
...  
Keyword(s):  
Negative Parity ◽  
Parity Band ◽  
Negative Parity Band

Concerning a Possible K = 7/2 Negative Parity Band in 29Si

1971 ◽  
Vol 49 (3) ◽  
pp. 355-359 ◽  
Author(s):  
R. H. Spear ◽  
J. E. Cairns ◽  
R. V. Elliott ◽  
J. A. Kuehner ◽  
A. A. Pilt
Keyword(s):  
Gamma Radiation ◽  
Linear Polarization ◽  
Negative Parity ◽  
Parity Band ◽  
Polarization Studies ◽  
Negative Parity Band

Linear polarization studies of gamma radiation from the reaction 26Mg(α,nγ)29Si show that the parity of the 3.623 MeV [Formula: see text] state is negative, and that the spin and parity of the 5.255 MeV state are [Formula: see text] or [Formula: see text]. A previously reported unique [Formula: see text] assignment for the latter state is not confirmed.

scholarly journals Nuclear Gamma-soft Character in ¹²⁸Ba

2021 ◽  
Vol 3 (3) ◽  
pp. 16-20
Author(s):  
I. Hossain ◽  
Hewa Y. Abdullah ◽  
I. M. Ahmed ◽  
Fadhil I. Sharrad
Keyword(s):  
Energy Level ◽  
Vector Boson ◽  
Negative Parity ◽  
Measured Data ◽  
Interacting Boson Model ◽  
Parity Band ◽  
Boson Model ◽  
Experimental Values ◽  
Negative Parity Band

We report the properties of gamma soft O(6) of 128Ba isotones with neutron N = 72 using Interacting Vector Boson Model (IVBM), interacting Boson Model (IBM-1), Bohr-Mottelson Model (BM), and Doma-El-Gendy (D-G) relation. The first energy level ( ) and ratio  have been investigated which show that 128Ba has gamma-soft character. The curves Eγ/Vs.J of E-GOS of even 128Ba nucleus were compared with the standard curves of vibrational, gamma soft and rotational limits. The staggering factors were studied of available measured data of 128Ba nucleus. The yrast levels of this isotope are calculated by the model of VBMI, IBM-1, BM and D-G and they were compared by measured data. The negative parity band of 128Ba was calculated by IVBM and BM model and compared with experimental values.

Negative-Parity Band inV48

1974 ◽  
Vol 33 (2) ◽  
pp. 105-108 ◽  
Author(s):  
B. Haas ◽  
P. Taras
Keyword(s):  
Negative Parity ◽  
Parity Band ◽  
Negative Parity Band

High-spin negative parity band in162Er

1976 ◽  
Vol 277 (2) ◽  
pp. 113-115 ◽  
Author(s):  
D. R. Zolnowski ◽  
H. Beuscher ◽  
T. T. Sugihara
Keyword(s):  
High Spin ◽  
Negative Parity ◽  
Parity Band ◽  
Negative Parity Band

scholarly journals "Beat" Patterns of Odd-Even Staggering in Octupole Bands of Light Actinides

2019 ◽  
Vol 11 ◽  
Author(s):  
Dennis Bonatsos ◽  
C. Daskaloyannis ◽  
S. B. Drenska ◽  
N. Karoussos ◽  
N. Minkov ◽  
...  
Keyword(s):  
Vector Boson ◽  
Negative Parity ◽  
Interacting Boson Model ◽  
Algebraic Models ◽  
Ground State Band ◽  
Parity Band ◽  
State Band ◽  
Boson Model ◽  
The Difference ◽  
Negative Parity Band

The Δ I = 1 staggering (odd-even staggering) in octupole bands of light actinides. is found to exhibit a "beat" behaviour as a function of the angular momentum J, forcing us to revise the traditional belief that this staggering decreases gradually to, zero and then remains at this zero value. Various algebraic models (spf-Interacting Boson Model, spdf-IBM, Vector Boson Model, Nuclear Vibron Model) predict in their su(3) limits constant staggering for this case, being thus unable to describe the "beat" behaviour. An explanation of the "beat" behaviour is given in terms of two Dunham expansions (expansions in terms of powers of I ( I + 1) ) with slightly different sets of coefficients for the ground state band and the negative parity band, the difference in the values of the coefficients being attributed to Coriolis couplings to other negative parity bands.

NEW 5− AND 6+ STATES IN Ne20

1964 ◽  
Vol 42 (3) ◽  
pp. 477-488 ◽  
Author(s):  
J. A. Kuehner ◽  
J. D. Pearson
Keyword(s):  
Excited States ◽  
Rotational Band ◽  
Ground State ◽  
Negative Parity ◽  
Alpha Particles ◽  
Excitation Energies ◽  
Angular Correlations ◽  
Fourth Member

Excited states of Ne20 at excitation energies of 8.46 Mev and 8.79 Mev have been identified and assigned spin and parity values of 5− and 6+, respectively. The excited states were produced in the C12(C12, α)Ne10 reaction and the spin assignments were made on the basis of angular correlations of the decay alpha particles from these states leaving O16 in its ground state. It is postulated that the 5− state is the fourth member of a K = 2 negative-parity rotational band based on the 2– 4.97-Mev state and that the 6+ state is the fourth member of a K = 0 rotational band based on the 0+ ground state of Ne20.

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