scholarly journals Short-range and tensor correlations in $^{4}$He and $^{8}$Be studied with the antisymmetrized quasi-cluster model

2019 ◽  
Vol 2019 (6) ◽  
Author(s):  
N Itagaki ◽  
H Matsuno ◽  
Y Kanada-En’yo
Keyword(s):  
Cluster Model ◽  
Short Range ◽  
Decisive Role ◽  
Blocking Effect ◽  
Repulsive Core ◽  
Pauli Blocking ◽  
Tensor Correlation ◽  
Coherent Effects ◽  
Middle Range ◽  
Tensor Part

Abstract We apply the tensor version of the antisymmetrized quasi-cluster model (AQCM-T) to $^4\textrm{He}$ and $^8\textrm{Be}$ while focusing on the $NN$ correlations in $\alpha$ clusters. We adopt the $NN$ interactions including realistic ones containing a repulsive core for the central part in addition to the tensor part. In $^4\textrm{He}$, the $pn$ pair in the $^3D$ channel has been known to play a decisive role in the tensor correlation and the framework is capable of treating not only this channel but also the $NN$ correlations in the $^1S$ and $^3S$ channels. In $^8\textrm{Be}$, when two $\alpha$ clusters approach, the $^3D$ pair is suppressed because of the Pauli blocking effect, which also induces a decrease in the $^3S$ component through the $^3S$–$^3D$ coupling. These coherent effects result in the reduction of the attractive effect of the central-even interaction in the middle-range region and keep the distance between two $\alpha$ clusters.

TENSOR CORRELATION IN He AND Li ISOTOPES BASED ON TENSOR OPTIMIZED SHELL MODEL WITH UNITARY CORRELATION OPERATOR

2009 ◽  
Vol 24 (11) ◽  
pp. 2150-2158
Author(s):  
TAKAYUKI MYO ◽  
KIYOSHI KATŌ ◽  
YUMA KIKUCHI ◽  
HIROSHI TOKI ◽  
KIYOMI IKEDA
Keyword(s):  
Shell Model ◽  
Short Range ◽  
Nuclear Force ◽  
Operator Method ◽  
Pauli Blocking ◽  
New Approach ◽  
Halo Structure ◽  
Tensor Correlation ◽  
Correlation Operator ◽  
Short Range Repulsion

We show the importance of the tensor correlation on the structures of He and Li isotopes. We develop the tensor optimized shell model (TOSM) to describe the strong tensor correlation of the nuclear force in nuclei. We investigate the exotic structures of 9,10,11 Li based on the 9 Li +n+n model where TOSM is used for 9 Li . The coupling between the tensor correlation in 9 Li and the extra two neutrons emerges Pauli-blocking, which increases the s2 component and develops the halo structure in 11 Li . We further treat the short range repulsion of the nuclear force by the unitary correlation operator method (UCOM), while the tensor correlation is described by TOSM. We propose a new approach of TOSM+UCOM to describe nuclei from the nuclear force.

NONLOCALITY IN THE QUARK-MODEL INDUCED TWO-BARYON POTENTIAL

2003 ◽  
Vol 18 (02n06) ◽  
pp. 147-150
Author(s):  
SACHIKO TAKEUCHI ◽  
KIYOTAKA SHIMIZU
Keyword(s):  
Cluster Model ◽  
Scattering Problem ◽  
Inverse Scattering Problem ◽  
Blocking Effect ◽  
Kinetic Term ◽  
Nonlocal Potential ◽  
Pauli Blocking ◽  
Incoming Wave ◽  
The One ◽  
Equivalent Local Potential

Roles of the nonlocality in the two-baryon potential derived from the quark cluster model, especially in the one from the quark Pauli-blocking effect on the kinetic term, is investigated by employing the inverse scattering problem. This effect can be understood by changing the degrees of the mixing between the incoming wave and the 0ℓ state of the inter-baryon-cluster wave function; which can be expressed by a baryon potential with high nonlocality. We look into the properties of this nonlocal potential by comparing it to the on-shell equivalent local potential. Their off-shell behaviors are very different from each other in the channels where the Pauli-blocking effect is large. The off-shell behavior of the nonlocal potential, however, seems to be simulated well when we keep the nonlocality of the potential between the 0s state and the other states.

scholarly journals Pauli-blocking effect in a quark cluster model

2003 ◽  
Vol 723 (3-4) ◽  
pp. 408-426
Author(s):  
Sachiko Takeuchi ◽  
Kiyotaka Shimizu
Keyword(s):  
Cluster Model ◽  
Blocking Effect ◽  
Pauli Blocking

scholarly journals The Review of Vehicular Safety Enhancement Through Wireless Protocol

2021 ◽  
pp. 122-126
Author(s):  
Dr. M. Sudha ◽  
S. Usha ◽  
Naveena M ◽  
Nisha P ◽  
Prabha R
Keyword(s):  
Short Range ◽  
Road Traffic ◽  
Network Access ◽  
Dense Area ◽  
The Road ◽  
Vehicle Communication ◽  
Dedicated Short Range Communication ◽  
Middle Range ◽  
Energy Limitation ◽  
Tesla Coil

Nowadays, Transportation is one of the primary and major needs of almost every human being that cannot be avoided. The road congested or road traffic are due to The increases in vehicles, which in turn results in road safety and increase accidents. In current society, there are many modern cars with tremendous features in it like, Mercedes, BMW, Audi, and Tesla and so on. Those cars are highly technical and even higher in price. Many people are not economical on buying those vehicles because the middle range vehicles are not capable of much attributes like, visualizing performance, driver safety and so on.., Anyway , the action of using something that is of highly mobile and energy limitation UVs for wireless communications also introduces many new provocation. Hence, we use Vehicle to Vehicle communication and vehicle to infrastructure communication are to reduce crashes. In addition to this, for an Electric unmanned vehicle we use Wireless charging to charge the vehicle with the help of the Tesla coil. In this system we use a (Dedicated short range communication) DSRC and Zigbee. Both DSRC and Zigbee are used for the communication between the vehicles within a certain range. Dedicated short range communication (DSRC) protocol is used for the network access since it reduces the delay in transmission time. Resentencing, there are research shows that using DSRC has a performance issue in a dense area or increased network load hence Zigbee is used along with DSRC since Zigbee perform well in dense area.

A SYSTEMATIC STUDY OF THE TENSOR CORRELATION IN He AND Li ISOTOPES

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2577-2580
Author(s):  
TAKAYUKI MYO ◽  
HIROSHI TOKI ◽  
SATORU SUGIMOTO ◽  
KIYOSHI KATŌ ◽  
YUMA KIKUCHI ◽  
...  
Keyword(s):  
Nuclear Force ◽  
Operator Method ◽  
Structure Study ◽  
Repulsive Core ◽  
Halo Structure ◽  
Tensor Correlation ◽  
Correlation Operator ◽  
Nuclear Structure Study ◽  
Range Correlation ◽  
New Framework

We investigate the tensor correlations in He and Li isotopes systematically. We propose the tensor-optimized shell model (TOSM) to describe the strong tensor correlation arising from the bare nuclear force in nuclei. Using TOSM for Li isotopes, we investigate the anomalous structures of 9,10,11 Li based on the 9 Li +n+n model where the 9 Li cluster is described by TOSM. As a result, the couplings between the tensor correlation in 9 Li and the extra two neutrons emerge Pauli-blocking, which naturally increases the s2 component to develop the halo structure in 11 Li . We further describe the short-range correlation arising from the repulsive core in the bare nuclear force by the unitary correlation operator method (UCOM). We propose the new framework of TOSM+UCOM for the nuclear structure study starting from the bare nuclear force.

scholarly journals RADII AND BINDING ENERGIES OF NUCLEI IN THE ALPHA-CLUSTER MODEL

2007 ◽  
Vol 22 (03) ◽  
pp. 227-242 ◽  
Author(s):  
G. K. NIE
Keyword(s):  
Experimental Data ◽  
Cluster Model ◽  
Short Range ◽  
Binding Energies ◽  
Coulomb Energy ◽  
Number Of Clusters ◽  
Charge Radii ◽  
Neutron Pair ◽  
Alpha Cluster ◽  
Good Agreement

The α-cluster model is based on two assumptions that the proton–neutron pair interactions are responsible for adherence between α-clusters and that the NN-interaction in the α-clusters is isospin independent. It allows one to estimate the Coulomb energy and the short range inter-cluster bond energy in dependence on the number of clusters. The charge radii are calculated from the number of α-clusters too. Unlike the Weizsäcker formula in this model the binding energies of alpha-clusters and excess neutrons are estimated separately. The calculated values are in a good agreement with the experimental data.

The structure of metallic melts in binary homogenous alloys: a thermodynamical understanding from the Wulff cluster model

2020 ◽  
Vol 22 (40) ◽  
pp. 23237-23245
Author(s):  
Lin Song ◽  
Xuelei Tian ◽  
Anchen Shao ◽  
Lijuan Li ◽  
Yongmei Zhang ◽  
...  
Keyword(s):  
Cluster Model ◽  
Short Range ◽  
New Model ◽  
Short Range Ordering ◽  
Metallic Melts

A new model to describe the short-range ordering in homogenous alloys (Cu–Ni and Ag–Au alloys).

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