Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using aBe12beam

2008 ◽  
Vol 78 (5) ◽  
Author(s):  
R. J. Charity ◽  
S. A. Komarov ◽  
L. G. Sobotka ◽  
J. Clifford ◽  
D. Bazin ◽  
...  
Keyword(s):  
Excited States ◽  
Light Nuclei ◽  
Resonance Decay ◽  
Decay Spectroscopy

scholarly journals β-γ and isomeric decay spectroscopy of 168Dy

2018 ◽  
Vol 178 ◽  
pp. 02023
Author(s):  
G.X. Zhang ◽  
H. Watanabe ◽  
F.G. Kondev ◽  
G.J. Lane ◽  
P.H. Regan ◽  
...  
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Experimental Work ◽  
Isomeric State ◽  
Level Structure ◽  
Primary Beam ◽  
Average Intensity ◽  
Experimental Procedure ◽  
Preliminary Results ◽  
Decay Spectroscopy

This contribution will report on the experimental work on the level structure of 168Dy. The experimental data have been taken as part of the EURICA decay spectroscopy campaign at RIBF, RIKEN in November 2014. In the experiment, a 238U primary beam is accelerated up to 345 MeV/u with an average intensity of 12 pnA. The nuclei of interest are produced by in-flight fission of 238U impinging on Be target with a thickness of 5 mm. The excited states of 168Dy have been populated through the decay from a newly identified isomeric state and via the β decay from 168Tb. In this contribution, scientific motivations, experimental procedure and some preliminary results for this study are presented.

scholarly journals First measurement of the 2.4 MeV and 2.9 MeV 6He three-cluster resonant states via the 3H(4He, pα)2n four-body reaction

2014 ◽  
Vol 29 (19) ◽  
pp. 1450105 ◽  
Author(s):  
Giuseppe Mandaglio ◽  
Orest Povoroznyk ◽  
Olga K. Gorpinich ◽  
Olexiy O. Jachmenjov ◽  
Antonio Anastasi ◽  
...  
Keyword(s):  
Excited States ◽  
Beam Energy ◽  
Threshold Energy ◽  
Theoretical Models ◽  
Light Nuclei ◽  
Energy Spectra ◽  
Excitation Energies ◽  
Resonant States ◽  
Peak Energy ◽  
Coincidence Spectra

Two new low-lying 6 He levels at excitation energies of about 2.4 MeV and 2.9 MeV were observed in the experimental investigation of the p-α coincidence spectra obtained by the 3 H (4 He , p α)2 n four-body reaction at E4 He beam energy of 27.2 MeV. The relevant E* peak energy and Γ energy width spectroscopic parameters for such 6 He * excited states decaying into the α+ n+n channel were obtained by analyzing the bidimensional (E p , Eα) energy spectra. The present new result of two low-lying 6 He * excited states above the 4 He +2 n threshold energy of 0.974 MeV is important for the investigation of the nuclear structure of neutron-rich light nuclei and also as a basic test for theoretical models in the study of the three-cluster resonance feature of 6 He .

Statistical giant dipole resonance decay of highly excited states ofCu63

1987 ◽  
Vol 36 (2) ◽  
pp. 612-627 ◽  
Author(s):  
M. Kicińska-Habior ◽  
K. A. Snover ◽  
C. A. Gossett ◽  
J. A. Behr ◽  
G. Feldman ◽  
...  
Keyword(s):  
Excited States ◽  
Giant Dipole Resonance ◽  
Dipole Resonance ◽  
Resonance Decay

scholarly journals Investigation of E1 Strength in Coulomb Excitation of Light Nuclei

1989 ◽  
Vol 42 (3) ◽  
pp. 233 ◽  
Author(s):  
FC Barke ◽  
CL Woods
Keyword(s):  
Harmonic Oscillator ◽  
Shell Model ◽  
Excited States ◽  
Single Particle ◽  
Coulomb Excitation ◽  
Light Nuclei ◽  
Additional Increase ◽  
Intermediate States ◽  
Experimental Values

Contributions to the predominantly E2 Coulomb excitation of the first excited states of 6U, 7U, lOB, 11 B, 12C and 170 due to virtual E1 transitions through intermediate states are calculated using for all states shell model wavefunctions of the lowest admissible configurations, obtained with a realistic Hamiltonian. When harmonic oscillator single-particle wavefunctions are used, the contributions can be calculated rigorously but are generally less than the experimental values. Increases due to use of Woods-Saxon wavefunctions are estimated in a semi-quantitative way. For 170, the additional increase due to admixtures from higher configurations in the wavefunctions is also considered.

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.

scholarly journals The scattering of α -particles in helium

1939 ◽  
Vol 172 (951) ◽  
pp. 559-567 ◽  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Potential Barrier Height ◽  
Light Nuclei ◽  
Coulomb Scattering ◽  
Particle Scattering ◽  
Broad Level ◽  
Resonances In Scattering ◽  
Α Particles

In a previous paper (Devons 1939) the author has discussed the possibility of observing resonance phenomena in the scattering of α -particles by light nuclei, and the experimental results given there show that in general resonances in scattering are observable for light nuclei of atomic number less than about 12 and for α -particle energies about equal to or greater than the potential barrier height. In the case of the scattering by helium nuclei the classical coulomb scattering is very small, and therefore anomalies in the scattering due to excited states of Be 8 , the compound nucleus formed by He 4 and an α -particle, should be comparatively easy to detect. In addition no disintegration is possible with α -particles of the energies used (less than 8.5 MeV), so that if the nucleus Be 8 is formed in an excited state it can only dissociate into two α -particles, and hence the width of any level of Be 8 excited by α -particle scattering in helium will be due practically entirely to elastic scattering. The investigation of the excited states of Be 8 by means of the scattering of α -particles by helium nuclei has a particular interest since the existence of a broad level of Be 8 with an excitation energy of about 3 MeV above the ground state, which is capable of splitting up into two α -particles, is postulated to account for the results of several disintegration experiments.

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