ALPHA CLUSTERING AND CONDENSATION IN NUCLEI

2011 ◽  
Vol 20 (04) ◽  
pp. 874-879 ◽  
Author(s):  
Y. FUNAKI ◽  
T. YAMADA ◽  
H. HORIUCHI ◽  
G. RÖPKE ◽  
P. SCHUCK ◽  
...  
Keyword(s):  
Orthogonality Condition ◽  
Low Density ◽  
Breakup Threshold ◽  
Condition Model ◽  
Strong Enhancement ◽  
Alpha Clustering ◽  
Α Particles

Low density states near the 3α and 4α breakup threshold in 12 C and 16 O , respectively, are discussed in terms of the α-particle condensation. Calculations are performed in OCM (Orthogonality Condition Model) and THSR (Tohsaki-Horiuchi-Schuck-Röpke) approaches. The [Formula: see text] state in 12 C and the [Formula: see text] state in 16 O are shown to have dilute density structures and give strong enhancement of the occupation of the S-state c.o.m. orbital of the α-particles. The possibility of the existence of α-particle condensed states in heavier nα nuclei is also discussed.

PRESENT STATUS OF ALPHA-PARTICLE CONDENSATE STATES IN SELF-CONJUGATE 4n NUCLEI

2008 ◽  
Vol 17 (10) ◽  
pp. 2087-2095 ◽  
Author(s):  
Y. FUNAKI ◽  
T. YAMADA ◽  
H. HORIUCHI ◽  
G. RÖPKE ◽  
P. SCHUCK ◽  
...  
Keyword(s):  
Alpha Particle ◽  
Present Status ◽  
The State ◽  
Orthogonality Condition ◽  
Low Density ◽  
Breakup Threshold ◽  
Large Component ◽  
Condition Model ◽  
Strong Enhancement ◽  
Α Particles

Low density states near the 3α and 4α breakup threshold in 12 C and 16 O , respectively, are discussed in terms of the α-particle condensation. Calculations are performed in OCM (Orthogonality Condition Model) and THSR (Tohsaki-Horiuchi-Schuck-Röpke) approaches. The [Formula: see text] state in 12 C and the [Formula: see text] state in 16 C are shown to have dilute density structures and give strong enhancement of the occupation of the S-state c.o.m. orbital of the α-particles. The [Formula: see text] state in 16 C has a large component of [Formula: see text] configuration, which is another reliable evidence of the state to be of 4α condensate nature. The possibility of the existence of α-particle condensed states in heavier nα nuclei is also discussed.

ALPHA CLUSTERING AND CONDENSATION IN 16O

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1939-1942
Author(s):  
Y. FUNAKI ◽  
T. YAMADA ◽  
H. HORIUCHI ◽  
G. RÖPKE ◽  
P. SCHUCK ◽  
...  
Keyword(s):  
Excited State ◽  
Strong Evidence ◽  
The State ◽  
Orthogonality Condition ◽  
Condensed State ◽  
Density Structure ◽  
Condition Model ◽  
Strong Enhancement ◽  
Alpha Clustering ◽  
Α Particles

The α-particle condensed state in 16 O is investigated by the use of 4α OCM (Orthogonality Condition Model). Low-lying spectrum in experiment is well reproduced up to around the 4α break-up threshold. The excited state obtained around the 4α threshold as the [Formula: see text] state is shown to have a dilute density structure and give strong enhancement of the occupation of the S-state c.o.m. orbital of the α-particles. This is strong evidence that the state is regarded as the 4α condensed state.

α-PARTICLE CONDENSED STATE IN 16O

2009 ◽  
Vol 18 (10) ◽  
pp. 2083-2087
Author(s):  
Y. FUNAKI ◽  
T. YAMADA ◽  
H. HORIUCHI ◽  
G. RÖPKE ◽  
P. SCHUCK ◽  
...  
Keyword(s):  
Excited State ◽  
Strong Evidence ◽  
The State ◽  
Orthogonality Condition ◽  
Condensed State ◽  
Density Structure ◽  
Large Component ◽  
Condition Model ◽  
Strong Enhancement ◽  
Α Particles

The α-particle condensed state in 16 O is investigated by the use of 4α OCM (Orthogonality Condition Model). Low-lying spectrum in experiment is well reproduced up to around the 4α threshold. Furthermore, the excited state obtained around the 4α threshold as the [Formula: see text] state is shown to have a dilute density structure and give strong enhancement of the occupation of the S-state c.o.m. orbital of the α-particles. This is strong evidence that the state is regarded as the 4α condensed state. It also has a large component of [Formula: see text] configuration, which is another reliable evidence of the state to be of 4α condensate nature.

DILUTE ALPHA-PARTICLE CONDENSATION IN 12C AND 16O

2008 ◽  
Vol 22 (25n26) ◽  
pp. 4545-4556
Author(s):  
T. YAMADA ◽  
Y. FUNAKI ◽  
H. HORIUCHI ◽  
A. TOHSAKI ◽  
G. RÖPKE ◽  
...  
Keyword(s):  
Alpha Particle ◽  
Equation Of Motion ◽  
Orthogonality Condition ◽  
Breakup Threshold ◽  
Hoyle State ◽  
Condition Model ◽  
Dilute Gas ◽  
Strong Candidate

Alpha particle condensation is studied in 12 C and 16 O with the orthogonality condition model (OCM). The OCM equation is an approximation of the equation of motion of α bosons based on microscopic theories. We demonstrate that 1) the Hoyle state (the [Formula: see text] state at 7.65 MeV in 12 C ), located just above the 3α disintegration threshold has a 3α-particle condensate character, in which 3α particles occupy an identical 0S orbit with 70 % occupancy, forming a dilute gas-like configuration, and 2) the [Formula: see text] state at Ex = 15.1 MeV in 16 O , appearing above the 4α breakup threshold, is a strong candidate with dilute 4α structure of the condensate-type.

scholarly journals Alpha-Clustering in Nuclear Matter at Low Density

1963 ◽  
Vol 29 (6) ◽  
pp. 933-935 ◽  
Author(s):  
Minoru Harada ◽  
Ryozo Tamagaki ◽  
Hajime Tanaka
Keyword(s):  
Nuclear Matter ◽  
Low Density ◽  
Alpha Clustering

CLUSTER STATES AND ALPHA PARTICLE CONDENSATION IN 13C

2008 ◽  
Vol 17 (10) ◽  
pp. 2101-2105 ◽  
Author(s):  
TAIICHI YAMADA ◽  
YASURO FUNAKI
Keyword(s):  
Alpha Particle ◽  
Cluster Model ◽  
Orthogonality Condition ◽  
Fair Agreement ◽  
Energy Spectra ◽  
Cluster States ◽  
Condition Model ◽  
Monopole Transition

The structure of 13 C is studied with the semi-microscopic cluster model, 3α+n orthogonality condition model (OCM). The energy spectra of four 1/2- states and three 1/2+ states up to Ex ~ 13 MeV are successfully reproduced, in particular, three monopole transition strengths are in fair agreement with the observed ones. We discuss the cluster states and alpha particle condensation in the 1/2± states appearing around the 12 C +n, 9 Be +α and 3α+n thresholds.

The orthogonality condition model applied to (α, α) scattering on12C and16O

1987 ◽  
Vol 98 (5) ◽  
pp. 529-537 ◽  
Author(s):  
S. M. Saad ◽  
V. B. Subbotin ◽  
K. A. Gridnev ◽  
E. F. Hefter ◽  
V. M. Semjonov
Keyword(s):  
Orthogonality Condition ◽  
Condition Model

scholarly journals α-Particle Condensation inO16Studied with a Full Four-Body Orthogonality Condition Model Calculation

2008 ◽  
Vol 101 (8) ◽  
Author(s):  
Y. Funaki ◽  
T. Yamada ◽  
H. Horiuchi ◽  
G. Röpke ◽  
P. Schuck ◽  
...  
Keyword(s):  
Model Calculation ◽  
Orthogonality Condition ◽  
Condition Model
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