Nuclear structure of the spin-isospin excited states inN13studied via the(He3,t)and(He3,tp)reactions at450MeV

2004 ◽  
Vol 69 (6) ◽  
Author(s):  
H. Fujimura ◽  
H. Akimune ◽  
I. Daito ◽  
M. Fujiwara ◽  
K. Hara ◽  
...  
Keyword(s):  
Nuclear Structure ◽  
Excited States

EVIDENCE FOR X(5) CRITICAL POINT SYMMETRY IN 128Ce

2006 ◽  
Vol 15 (08) ◽  
pp. 1735-1740 ◽  
Author(s):  
D. L. BALABANSKI ◽  
K. A. GLADNISHKI ◽  
G. LO BIANCO ◽  
A. SALTARELLI ◽  
N. V. ZAMFIR ◽  
...  
Keyword(s):  
Critical Point ◽  
Nuclear Structure ◽  
Excited States ◽  
Ground State ◽  
Doppler Shift ◽  
Point Symmetry ◽  
Yale University ◽  
Doppler Shift Attenuation ◽  
Recoil Distance ◽  
Predicted Values

Lifetimes of excited states in 128 Ce were measured using the recoil distance Doppler-shift (RDDS) and the Doppler-shift attenuation (DSAM) methods. The experiments were performed at the Wright Nuclear Structure Laboratory of Yale University. Excited states of 128 Ce were populated in the 100 Mo (32 Si ,4 n ) reaction at 120 MeV and the nuclear γ decay was measured with an array of eight Clover detectors positioned at forward and backward angles. The deduced yrast transition strengths together with the energies of the levels within the ground-state (gs) band of 128 Ce are in agreement with the predicted values for the X (5) critical point symmetry. Thus, we suggest 128 Ce as a benchmark X (5) nucleus in the mass A ≈ 130 region.

scholarly journals Goodness of Generalized Seniority in Even-even Sn Isotopes.

2019 ◽  
Vol 6 (2) ◽  
pp. 147-154
Author(s):  
Bhoomika Maheshwari
Keyword(s):  
Nuclear Structure ◽  
Quantum Number ◽  
Excited States ◽  
High Spin ◽  
Magic Numbers ◽  
Selection Rules ◽  
Good Quantum Number ◽  
Spin Isomers ◽  
Configuration Mixing

Seniority has proved to be a unique and simple probe to address some of the complex issues underlying nuclear structure of nuclei close to magic numbers. An extension from the concept of seniority in single-j shell to generalized seniority in multi-j shell has recently been provided by us. We have, consequently, established new selection rules for gamma decays and discovered the new seniority isomers decaying via odd electric multipole operators. We have successfully explained the B(EL; L=1,2,3) behavior of various high spin isomers and other excited states. More specifically, we have been able to explain the long-standing puzzle of double hump in the B(E2) values for the first excited 2+ states of even-even Z=50 (Sn) isotopes. In the present paper, we review these generalized seniority calculations with emphasis on even-even Sn isotopes. We first discuss the generalized seniority results for the E1 decaying 13- isomers and E2 decaying 10+, 15- isomers, and then present the cases of first-excited 2+ and 3- states. The generalized seniority proves out to be a reasonably good quantum number. The significance of configuration mixing is found to be true. The calculated results has been validated till high seniority v=4 states and expected to be valid for higher seniority v=6,… states also.  

STUDY OF LIGHT NUCLEI WITH BRUECKNER-AMD+GCM

2009 ◽  
Vol 24 (11n13) ◽  
pp. 1013-1016 ◽  
Author(s):  
TAKAOMI MURAKAMI ◽  
TOMOAKI TOGASHI ◽  
KIYOSHI KATŌ
Keyword(s):  
Molecular Dynamics ◽  
Nuclear Structure ◽  
Excited States ◽  
Nuclear Force ◽  
Light Nuclei ◽  
Generator Coordinate Method ◽  
Coordinate Method ◽  
Generator Coordinate ◽  
New Framework ◽  
Brueckner Theory

To describe excited nuclear states, we developed the Brueckner-AMD combining the Brueckner theory with Antisymmetrized Molecular Dynamics (AMD), which has been recently proposed as a new framework to study nuclear structure of light nuclei based on the realistic nuclear force. In the present framework, we formulate a multi-configuration calculation with Generator Coordinate Method (GCM) in the Brueckner-AMD. An application is shown for the excited states with positive and negative parities in 4 He , and the successful results and reliability of the present framework are discussed.

NUCLEAR STRUCTURE OF 150Sm IN THE DPPQ MODEL AND IBM

2010 ◽  
Vol 19 (07) ◽  
pp. 1491-1511 ◽  
Author(s):  
J. B. GUPTA ◽  
K. KUMAR ◽  
J. H. HAMILTON
Keyword(s):  
Nuclear Structure ◽  
Excited States ◽  
Structural Characteristics ◽  
Microscopic Theory ◽  
Collective Model ◽  
Alternative View ◽  
Transition Rates ◽  
Spectroscopic Factors ◽  
Decay Pattern ◽  
Boson Model

The decay pattern of the low lying levels in the shape transitional nucleus 150 Sm is analyzed in terms of the quasi-vibrational and quasi-rotational collective model. The Dynamic Pairing plus quadrupole Model in the microscopic theory of the collective model is employed to predict extensive structure characteristics. The potential energy surface (PES), the spectroscopic factors and the E2, E0 transition rates from the DPPQ model are illustrated. Comparison is made with the predictions in the Interacting Boson Model (IBM-1). A correspondence is demonstrated of the effect of the control parameter in the two models on the calculated nuclear structure. The study of the wave functions of the two spin I = 2 excited states in IBM is carried out. The alternative view of an anharmonic vibrator and a soft rotor is discussed in terms of the E2 transition rates and other structural characteristics.

STRUCTURE OF THE NEUTRON RICH Ga AND Ge ISOTOPES OBSERVED AT ALTO

2009 ◽  
Vol 18 (10) ◽  
pp. 1976-1980 ◽  
Author(s):  
D. VERNEY ◽  
M. LEBOIS ◽  
F. IBRAHIM ◽  
S. ESSABAA ◽  
F. AZAIEZ ◽  
...  
Keyword(s):  
Nuclear Structure ◽  
Excited States ◽  
Careful Analysis ◽  
Mass Separator ◽  
Decaying States ◽  
On Line

During test runs dedicated to the commissioning of ALTO (Accélérateur Linéaire et Tandem à Orsay), β and β- n decay of the very neutron rich [Formula: see text] could be observed at the tape station installed on-line with the PARRNe mass-separator. γ-lines observed in the resulting spectra and a careful analysis of the balance of their relative intensities point toward the existence of two β-decaying states in 84 Ga . The decay of these long-lived states appear to feed the [Formula: see text] and [Formula: see text] excited states of [Formula: see text] and the [Formula: see text] state in [Formula: see text] allowing a significant improvement of the knowledge on nuclear structure in the immediate vicinity of 78 Ni .

COUPLED-CLUSTER THEORY FOR NUCLEI

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5338-5345 ◽  
Author(s):  
T. PAPENBROCK ◽  
D. J. DEAN ◽  
J. R. GOUR ◽  
G. HAGEN ◽  
M. HJORTH-JENSEN ◽  
...  
Keyword(s):  
Nuclear Structure ◽  
Excited States ◽  
Low Energy ◽  
Structure Theory ◽  
Coupled Cluster ◽  
Coupled Cluster Theory ◽  
Cluster Theory ◽  
Body Forces ◽  
Recent Developments ◽  
Three Body

This presentation focuses on some of the recent developments in low-energy nuclear structure theory, with emphasis on applications of coupled-cluster theory. We report on results for ground and excited states in 4 He and 16 O , and about extensions of coupled-cluster theory to treat three-body forces.

THE SYMMETRY ENERGY AND OTHER OPEN QUESTIONS CONCERNING EFFECTIVE FUNCTIONALS

2009 ◽  
Vol 18 (04) ◽  
pp. 1008-1013
Author(s):  
G. COLÒ
Keyword(s):  
Nuclear Structure ◽  
Excited States ◽  
Symmetry Energy ◽  
Nuclear Energy ◽  
Energy Functional ◽  
Giant Resonances ◽  
Structure Community ◽  
Open Questions ◽  
Physical Background ◽  
Free Parameters

The nuclear structure community is striving to determine a nuclear energy functional which is as universal and as accurate as possible. When a functional is determined by fitting free parameters, the constraints on these parameters coming from excited states (like the well-known giant resonances) are not, as a rule, imposed. This work shows that at least three constraints could be imposed on Skyrme functionals, by explaining the physical background and discussing their relevance.

scholarly journals Nuclear magnetic moment studies of short–lived excited states at the edge of the island of inversion: the IS628 experiment

2019 ◽  
Vol 26 ◽  
pp. 44
Author(s):  
A. Khaliel ◽  
D. Papaioannou ◽  
G. Zagoraios ◽  
T. J. Mertzimekis
Keyword(s):  
Nuclear Structure ◽  
Excited States ◽  
Angular Distributions ◽  
Shape Coexistence ◽  
Shell Closure ◽  
Radioactive Beams ◽  
Island Of Inversion ◽  
Highly Sensitive ◽  
Time Differential ◽  
Orientation Phenomenon

Nuclear gfactors are highly sensitive to the single–particle aspects of the wave function, revealing important information for the nuclear structure along the isotopic chart. The sdshell has been thoroughly studied, resulting in “universal” shell model Hamiltonians [1] and the development of an M1 operator [2]. However, there is still shortage of precise experimental gfactor data of excited states to consolidate the nuclear structure in this regime.      Recently, the Time Differential Recoil in Vacuum (TDRIV) experimental technique was revamped to be applicable for radioactive beams. TDRIV has been tested successfully and produced high-precision results for the stable 24Mg nucleus [3]. However, the successful application of the technique relies heavily on calibrations of the de–orientation phenomenon.      A recent experiment using the MINIBALL array at REX/ISOLDE (IS628) has focused on the application of the method with a radioactive 28Mg beam. The gfactor of the 28Mg first 2+excited state can act as an excellent probe of the N=16 shell gap and the νd3/2singleparticle energy, as well as the possible presence of spdfadmixtures. The particular measurement will be a next step towards a gfactor measurement on 32Mg in the center of the “island of inversion”, where the N=20 shell closure breaks down enhancing 1p–1h excitations and shape–coexistence.           In this work, the analysis of the spectroscopic data recorded for a 22Ne beam, which was used for calibrating the experimental method before the actual run on 28Mg is reported. Preliminary data on the angular distributions for the 22Ne 21+→ 0+transition will be presented, an important prerequisite before a remeasurement of g(22Ne;21+).

Nuclear Structure of 63Ni by IAR

1974 ◽  
Vol 52 (5) ◽  
pp. 402-405 ◽  
Author(s):  
K. Ramavataram ◽  
G. F. Mercier ◽  
C. St-Pierre ◽  
D. Sykes ◽  
C. S. Yang ◽  
...  
Keyword(s):  
Shell Model ◽  
Nuclear Structure ◽  
Excited States ◽  
Isobaric Analogue ◽  
Spectroscopic Factors ◽  
Model Predictions

The isobaric analogue resonances of the low excited states of 63Ni have been studied by bombarding targets of 62Ni with protons of energies between 2.5 and 5.0 MeV. Spins as well as the elastic and inelastic widths for some of these states have been determined. The spectroscopic factors that were deduced are compared with shell model predictions.

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