Energies of Some 25Al Levels from the 24Mg(p,γ)25Al Reaction and the Coulomb-Energy Differences of Analog Rotational Bands

1971 ◽  
Vol 49 (4) ◽  
pp. 402-406 ◽  
Author(s):  
F. Everling ◽  
G. L. Morgan ◽  
D. W. Miller ◽  
L. W. Seagondollar ◽  
P. W. Tillman Jr.
Keyword(s):  
Gamma Rays ◽  
Ground State ◽  
Mass Number ◽  
Resonance Energy ◽  
Coulomb Energy ◽  
Q Value ◽  
Ground State Band ◽  
Excitation Energies ◽  
Rotational Bands ◽  
State Band

Gamma rays from the 24Mg(p, γ)25Al reaction at the 1201 and 1485 keV resonances were measured with a 20 cm3 Ge(Li) detector. Excitation energies obtained for known levels in 25Al are (in keV): 1612.5 ± 0.5, 1789.6 ± 1.3, 3424.3 ± 0.6, and 3696.3 ± 1.1. By using the known 1201.4 ± 1.0 keV resonance energy, a more precise Q value of 2271.4 ± 1.2 keV is obtained, 16 keV lower than the previous value which had a 6 keV uncertainty.A brief discussion of the Coulomb-energy differences of 25Al and 25Mg analog rotational bands in relation to the 24Mg ground-state band is given and compared with the situation at mass number A = 21.

scholarly journals NEW STRUCTURES IN 178HF AND COULOMB EXCITATION OF ISOMERS

2011 ◽  
Vol 20 (02) ◽  
pp. 474-481 ◽  
Author(s):  
A.B. HAYES ◽  
D. CLINE ◽  
C. Y. WU ◽  
A.M. HURST ◽  
M.P. CARPENTER ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Ground State ◽  
Coulomb Excitation ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Particle Detector ◽  
Ground State Band ◽  
Rotational Bands ◽  
Coincidence Data ◽  
State Band

A 985 MeV 178 Hf beam was Coulomb excited by a 208 Pb target at the ATLAS accelerator of Argonne National Laboratory. Gammasphere and the CHICO particle detector recorded particle-γ coincidence data. The aim was to populate and determine the mechanism of previously observed Coulomb excitation of the Kπ = 6+ (t1/2 = 77 ns ), 8- (4 s ) and 16+ (31 y ) isomer bands. New rotational bands were identified including an aligned band which appears to mix with the ground-state band (GSB) and the γ-vibrational band above ~ 12 ħ of angular momentum. Newly observed γ-decay transitions into the three isomer bands may elucidate the K-mixing which allows Coulomb excitation of these isomer bands, but direct decays from the GSB into the 16+ isomer band have not yet been confirmed.

The ground state band of25Mg studied by electron scattering

1975 ◽  
Vol 1 (2) ◽  
pp. L13-L17 ◽  
Author(s):  
E W Lees ◽  
C S Curran ◽  
S W Brian ◽  
W A Gillespie ◽  
A Johnston ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Ground State ◽  
Ground State Band ◽  
State Band

Spin Alignment of the Ground-State Band Levels in Nd and Sm Isotopes Excited in (α, 2nγ) Reactions

1972 ◽  
Vol 33 (6) ◽  
pp. 1515-1521 ◽  
Author(s):  
Hiroyasu Ejiri ◽  
Tokushi Shibata ◽  
Akira Shimizu ◽  
Kohsuke Yagi
Keyword(s):  
Ground State ◽  
Ground State Band ◽  
Spin Alignment ◽  
State Band

scholarly journals Variational procedure leading from Davidson potentials to the E(5)and X(5) critical point symmetries

2020 ◽  
Vol 13 ◽  
pp. 10
Author(s):  
Dennis Bonatsos ◽  
D. Lenis ◽  
N. Minkov ◽  
D. Petrellis ◽  
P. P. Raychev ◽  
...  
Keyword(s):  
Phase Transition ◽  
Critical Point ◽  
Ground State ◽  
Nuclear Energy ◽  
Energy Spectra ◽  
Variational Procedure ◽  
Ground State Band ◽  
Sharp Maximum ◽  
State Band ◽  
Shape Phase Transition

Davidson potentials of the form β^2 + β0^4/β^2, when used in the original Bohr Hamiltonian for γ-independent potentials bridge the U(5) and 0(6) symmetries. Using a variational procedure, we determine for each value of angular momentum L the value of β0 at which the derivative of the energy ratio RL = E(L)/E(2) with respect to β0 has a sharp maximum, the collection of RL values at these points forming a band which practically coincides with the ground state band of the E(5) model, corresponding to the critical point in the shape phase transition from U(5) to Ο(6). The same potentials, when used in the Bohr Hamiltonian after separating variables as in the X(5) model, bridge the U(5) and SU(3) symmetries, the same variational procedure leading to a band which practically coincides with the ground state band of the X(5) model, corresponding to the critical point of the U(5) to SU(3) shape phase transition. A new derivation of the Holmberg-Lipas formula for nuclear energy spectra is obtained as a by-product.

Ground-state band inSe72

1977 ◽  
Vol 15 (3) ◽  
pp. 939-949 ◽  
Author(s):  
K. P. Lieb ◽  
J. J. Kolata
Keyword(s):  
Ground State ◽  
Ground State Band ◽  
State Band

scholarly journals Konversionselektronen von 156Gd nach Neutroneneinfang / The Conversion Electron Spectrum of the Reaction 155Gd(n,e)156Gd

1974 ◽  
Vol 29 (1) ◽  
pp. 17-30
Author(s):  
K. Schreckenbach
Keyword(s):  
Ground State ◽  
Conversion Electron ◽  
Electron Spectrum ◽  
Vibrational Band ◽  
Ground State Band ◽  
Conversion Electron Spectrum ◽  
State Band

The conversion electron spectrum of the reaction 155Gd (n, e) 156Gd has been measured up to 8.5 MeV. The results below 4.5 MeV are presented and multipolarities are determined with these results. E0 admixtures of the Δ I = 0 transitions from the 0 + β-vibrational band to the ground state band were determined with 15% accuracy. 156Gd level schemes are discussed and extended by new spin and parity assignments.

Branching Ratios and Lifetimes of 25Mg Levels between 5.2 and 6.1 MeV

1975 ◽  
Vol 53 (2) ◽  
pp. 123-132 ◽  
Author(s):  
R. W. Ollerhead ◽  
D. C. Kean ◽  
S. G. T. Leong ◽  
C. Doekes ◽  
T. M. R. Meadley
Keyword(s):  
Gamma Ray ◽  
Branching Ratios ◽  
Surface Barrier ◽  
Surface Barrier Detector ◽  
Ground State Band ◽  
Rotational Model ◽  
Rotational Bands ◽  
Barrier Detector ◽  
State Band ◽  
Combined Data

All levels between 5.2 and 6.1 MeV in 25Mg have been studied using the reaction 25Mg(p,p′γ). Inelastically scattered protons were detected in an annular surface barrier detector located at 180°; coincidence gamma-ray spectra were obtained at Ge(Li) detector angles of 90, 45, and 135°. Level energies were determined from unshifted gamma-ray energies recorded in the 90° spectra. Lifetimes were obtained from the attenuated Doppler shift of gamma-ray energies recorded in spectra taken at forward and backward angles. Branching ratios were deduced from the combined data of all three angles. The identification of levels as members of rotational bands is discussed, and transition strengths deduced from the present measurements are compared with predictions of the simple rotational model. In particular, evidence is presented for the identification of a level at 5535 keV as the 11/2 member of the ground state band, levels at 5522 and 5794 keV as the 5/2 and 11/2 members of the Kπ = 1/2− band, and a level at 6040 keV as the 11/2 member of a Kπ = 9/2+ band.

Rotation-particle coupling in the ground state band of 161Dy

1972 ◽  
Vol 184 (1) ◽  
pp. 113-137 ◽  
Author(s):  
S.A. Hjorth ◽  
A. Johnson ◽  
G. Ehrling
Keyword(s):  
Ground State ◽  
Ground State Band ◽  
State Band
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