ALPHA CLUSTERS IN MEDIUM LIGHT NUCLEI: RECENT RESULTS AND OPEN QUESTIONS

2008 ◽  
Vol 17 (10) ◽  
pp. 2025-2028 ◽  
Author(s):  
MARKUS NORRBY ◽  
MÅRTEN BRENNER ◽  
TOM LÖNNROTH ◽  
KJELL-MIKAEL KÄLLMAN
Keyword(s):  
Cross Section ◽  
Energy Levels ◽  
Cluster Structure ◽  
Alpha Particles ◽  
Light Nuclei ◽  
Scattering Data ◽  
Cluster States ◽  
Open Questions ◽  
Alpha Cluster ◽  
Rich Side

The presence of alpha cluster structures in light nuclei is well established. This paper concentrates on the medium light nuclei between 16 O and 44 Ti . Especially the nucleus 32 S has been examined in detail and new data is presented. The elastic scattering data of alpha particles on 28 Si forming 32 S shows a peculiar disappearance of cross section at 31 MeV excitation energy and above. Also, the energy versus J(J + 1) plot shows at least one clear rotational-like band of alpha cluster states, with the main energy levels split into many narrow and closely lying levels with the same spin. Furthermore, few experiments have been carried out investigating the alpha cluster structure of non-nα nuclei, especially on the proton rich side of stability. The evidence at hand indicates that adding neutrons retains some alpha cluster structures and in some cases might even enhance them, but adding protons seems to destroy the structures.

scholarly journals The energy levels of some light nuclei

1936 ◽  
Vol 155 (886) ◽  
pp. 519-532 ◽  
Keyword(s):  
Energy Levels ◽  
Alpha Particles ◽  
Light Nuclei

The protons emitted by light nuclei when they are disintegrated by alpha particles have been shown by Bothe and Fränz and by a number of other workers to consist of groups, each group being nearly homogeneous in velocity. It is possible to deduce the energy levels of a number of light nuclei from a study of these groups. Consider the disintegration represented by the equation, A + He 4 → B + H 1 .

Properties of the alpha cluster states of [sup 212]Po from elastic scattering of alpha particles from [sup 208]Pb

2012 ◽  
Author(s):  
C. Basu ◽  
S. Adhikari ◽  
S. Bhattacharya ◽  
C. Bhattacharya ◽  
T. K. Ghosh ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Alpha Particles ◽  
Cluster States ◽  
Alpha Cluster

scholarly journals Alpha cluster states in light nuclei populated through the (6Li,d) reaction

2012 ◽  
Author(s):  
Thereza Lewin ◽  
M. R.D. Rodrigues ◽  
L. Horodynski B. Matsushingue ◽  
J. L.M. Duarte ◽  
C. L.M. Rodrigues ◽  
...  
Keyword(s):  
Light Nuclei ◽  
Cluster States ◽  
Alpha Cluster

scholarly journals Two-Center Gaussian Potential Well for Studying Light Nucleus in Cluster Structure

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Nafiseh Roshanbakht ◽  
Mohammad Reza Shojaei
Keyword(s):  
Light Nucleus ◽  
Energy Levels ◽  
Cluster Structure ◽  
Spherical Shape ◽  
Light Nuclei ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Potential Well ◽  
Cylindrical Coordinates ◽  
Gaussian Potential

The clustering phenomena are very important to determine structure of light nuclei and deformation of spherical shape is inevitable. Hence, we calculated the energy levels of two-center Gaussian potential well including spin-orbit coupling by solving the Schrödinger equation in the cylindrical coordinates. This model can predict the spin and parity of the light nuclei that have two identical cluster structures.

THE STUDY OF α + 14C CLUSTER STATES OF 18O THROUGH THE RESONANT BREAKUP REACTION 12C(18O, 14Cα) AT E(18O) = 94.5 MeV

2009 ◽  
Vol 18 (09) ◽  
pp. 1917-1928 ◽  
Author(s):  
S. ADHIKARI ◽  
C. BASU ◽  
B. R. BEHERA ◽  
S. RAY ◽  
A. K. MITRA ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Excitation Energy ◽  
Cluster Structure ◽  
Breakup Reaction ◽  
Spectroscopy Technique ◽  
Cluster States ◽  
Excitation Energy Spectrum ◽  
Resonant States ◽  
Alpha Cluster

In this work, we study the alpha cluster structure of 18 O using resonant particle spectroscopy technique. Resonance breakup reaction of the projectile is studied experimentally to extract the excitation energy spectrum of the 18 O nucleus. The observed resonant states in the present work are 15.62, 15.82 (5-), 16.02, 16.22, 16.42, 16.92, 17.22, and 17.82 MeV.

Nuclear Electrons and Nuclear Structure

2018 ◽  
Author(s):  
Roger H. Stuewer
Keyword(s):  
Nuclear Structure ◽  
Beta Decay ◽  
Gamma Rays ◽  
Alpha Particle ◽  
Continuous Distribution ◽  
Alpha Particles ◽  
Light Nuclei ◽  
Coincidence Method ◽  
Wolfgang Pauli ◽  
Beta Particles

Serious contradictions to the existence of electrons in nuclei impinged in one way or another on the theory of beta decay and became acute when Charles Ellis and William Wooster proved, in an experimental tour de force in 1927, that beta particles are emitted from a radioactive nucleus with a continuous distribution of energies. Bohr concluded that energy is not conserved in the nucleus, an idea that Wolfgang Pauli vigorously opposed. Another puzzle arose in alpha-particle experiments. Walther Bothe and his co-workers used his coincidence method in 1928–30 and concluded that energetic gamma rays are produced when polonium alpha particles bombard beryllium and other light nuclei. That stimulated Frédéric Joliot and Irène Curie to carry out related experiments. These experimental results were thoroughly discussed at a conference that Enrico Fermi organized in Rome in October 1931, whose proceedings included the first publication of Pauli’s neutrino hypothesis.

7. Inelastic scattering of 42 Mev alpha-particles from light nuclei

Physica ◽  
1956 ◽  
Vol 22 (6-12) ◽  
pp. 1126-1127 ◽  
Author(s):  
J.S. Blair ◽  
E.M. Henley
Keyword(s):  
Inelastic Scattering ◽  
Alpha Particles ◽  
Light Nuclei
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