Shell-model predictions for electromagnetic properties ofN=50nuclei

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.

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EXOTIC ELECTROMAGNETIC TRANSITIONS IN NEUTRON-RICH CARBON ISOTOPES

International Journal of Modern Physics E ◽

10.1142/s0218301309014147 ◽

2009 ◽

Vol 18 (10) ◽

pp. 1992-1996 ◽

Cited By ~ 3

Author(s):

TOSHIO SUZUKI ◽

TAKAHARU OTSUKA

Keyword(s):

Shell Model ◽

Carbon Isotopes ◽

Magnetic Dipole ◽

Tensor Force ◽

Electromagnetic Properties ◽

Matrix Elements ◽

Electromagnetic Transitions ◽

Model Calculations ◽

Shell Matrix ◽

Model Hamiltonian

Structure and electromagnetic properties of exotic neutron-rich carbon isotopes are studied by shell model calculations. A p-sd shell model Hamiltonian is modified by enhancing the effects of the tensor force in the p-sd cross shell matrix elements as well as with corrections in the T=1 monopole terms. A considerable suppression of the magnetic dipole (M1) transition in 17 C from the [Formula: see text] state recently observed is found to be well explained by the modified Hamiltonian. The anomalous hindrance of the quadrupole (E2) transitions in 16 C and 18 C is also shown to be reproduced by our new Hamiltonian.

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STUDIES IN THE DECAY OF THE ACTIVE DEPOSIT OF ACTINIUM: I. ALPHA–GAMMA ANGULAR CORRELATION IN THE DECAY OF Bi211 (AcC)

Canadian Journal of Physics ◽

10.1139/p64-164 ◽

1964 ◽

Vol 42 (9) ◽

pp. 1798-1812 ◽

Cited By ~ 8

Author(s):

C. R. Cothern ◽

R. D. Connor

Keyword(s):

Shell Model ◽

Angular Correlation ◽

Angular Momenta ◽

Mixing Parameters ◽

Isotropic Distribution ◽

Model Predictions ◽

Γ Ray ◽

Polarization Correlation ◽

Do So ◽

Isotropy Condition

The α–γ angular correlation of the cascade Bi211(α, 6.27 MeV)Tl207*(γ, 350 keV)Tl207 has been found to be isotropic to within [Formula: see text].Accepting the spin and parity of the ground state of Tl207as 1/2+, a search was made for all reasonable spins and angular momenta, pure and mixed, which could yield an isotropic correlation. Shell-model predictions and other situations have been examined. No case of unmixed α-, unmixed γ-angular momenta satisfies the isotropy condition. Many other cases are found which do so, but only with the spin and parity of the excited state of Tl207 taken as 3/2+. It has been shown that 5/2+ does not yield an isotropic correlation. With one radiation mixed and the other pure, there are eight possible combinations which fit the observations. With both radiations mixed, there is an infinity of combinations of the two mixing parameters which lead to an isotropic distribution. The αk value of the 350-keV transition (0.175 ± 0.017) shows the γ ray in question to be 76% M1 and 24% E2. The present work is consistent with only one of the two possibilities given by Gorodetzky et al. (1962) from polarization–correlation work. Accepting this additional evidence it would appear that the most plausible interpretation is that of shell-model spins and parities with both radiations mixed, α—(λ = 3, 5), γ—(76% M1, 24% E2).

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Shell model predictions for19N(β−)19O

Physical Review C ◽

10.1103/physrevc.38.935 ◽

1988 ◽

Vol 38 (2) ◽

pp. 935-939 ◽

Cited By ~ 15

Author(s):

E. K. Warburton

Keyword(s):

Shell Model ◽

Model Predictions

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Shell-Model Investigation of Electromagnetic Properties of 57Ni and 55Co

Progress of Theoretical Physics ◽

10.1143/ptp.54.429 ◽

1975 ◽

Vol 54 (2) ◽

pp. 429-437 ◽

Cited By ~ 2

Author(s):

T. Motoba

Keyword(s):

Shell Model ◽

Model Investigation ◽

Electromagnetic Properties

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An Investigation of Odd Parity States in 32S

Canadian Journal of Physics ◽

10.1139/p74-130 ◽

1974 ◽

Vol 52 (11) ◽

pp. 950-958 ◽

Cited By ~ 8

Author(s):

H. Grawe ◽

J. E. Cairns ◽

M. W. Greene ◽

J. A. Kuehner

Keyword(s):

Shell Model ◽

Excited States ◽

Linear Polarization ◽

Doppler Shift ◽

Polarization Measurement ◽

Angular Distributions ◽

Resonance States ◽

Mixing Ratios ◽

Model Predictions

States in 32S have been populated using the 31P(p,γ) reaction at the Ep = 895, 1438, and 1583 keV resonances. Angular distributions, a linear polarization measurement, and the results from the 32S(α,α′) reaction at 180° yielded the following spin and/or parity assignments for bound levels Jπ(6.62) = 4−, Jπ(6.76) = 3−, 4+, 5−, Jπ(6.85) = 3−, 4+, and Jπ(7.95) = 3, 4, 5−, and for resonance states J(10.26) = 4 and J(10.40) = 4. The γ decay of selected excited states has been studied and mixing ratios were obtained for the strongest branches. Doppler shift measurements yielded lifetimes of 810 (−250, +350) fs, > 300 fs and 110 (−40, +60) fs for the states at 6.62, 6.76, and 7.95 MeV respectively. The results are discussed and compared with shell model predictions.

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Radiative Width of the 6+ Level in 20Ne at 8.78 MeV

Canadian Journal of Physics ◽

10.1139/p71-165 ◽

1971 ◽

Vol 49 (11) ◽

pp. 1397-1400 ◽

Cited By ~ 14

Author(s):

D. W. O. Rogers ◽

J. H. Aitken ◽

A. E. Litherland ◽

W. R. Dixon ◽

R. S. Storey

Keyword(s):

Shell Model ◽

Transition Strength ◽

Radiative Width ◽

Model Predictions

The radiative width of the 6+ resonance at Eα = 5.06 MeV in the 16O(α, γ)20Ne reaction has been measured to be ωγ = 1.30 ± 0.20 eV corresponding to a transition strength of 20 ± 3 W.u. for the 6+ to 4+ transition in 20Ne. Comparison is made to rotational and shell model predictions.

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Projected shell model study of band spectra and electromagnetic properties of 160–164Ho

Nuclear Physics A ◽

10.1016/j.nuclphysa.2015.08.002 ◽

2015 ◽

Vol 943 ◽

pp. 39-57 ◽

Cited By ~ 1

Author(s):

Barun Slathia ◽

Rani Devi ◽

S.K. Khosa

Keyword(s):

Shell Model ◽

Electromagnetic Properties ◽

Projected Shell Model ◽

Model Study ◽

Band Spectra

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Systematic shell-model study on spectroscopic properties from light to heavy nuclei

EPJ Web of Conferences ◽

10.1051/epjconf/201817802016 ◽

2018 ◽

Vol 178 ◽

pp. 02016

Author(s):

Cenxi Yuan

Keyword(s):

Shell Model ◽

Energy Levels ◽

Spectroscopic Properties ◽

Energy Difference ◽

Binding Energies ◽

Electromagnetic Properties ◽

Heavy Nuclei ◽

Weakly Bound ◽

Model Study ◽

Special Case

A systematic shell-model study is performed to study the spectroscopic properties from light to heavy nuclei, such as binding energies, energy levels, electromagnetic properties, and β decays. The importance of cross-shell excitation is shown in the spectroscopic properties of neutron-rich boron, carbon, nitrogen, and oxygen isotopes. A special case is presented for low-lying structure of 14C. The weakly bound effect of proton 1s1/2 orbit is necessary for the description of the mirror energy difference in the nuclei around A=20. Some possible isomers are predicted in the nuclei in the southeast region of 132Sn based on a newly suggested Hamiltonian. A preliminary study on the nuclei around 208Pb are given to show the ability of the shell model in the heavy nuclei.

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