scholarly journals Origin of Low- and High-Energy Monopole Collectivity in 132Sn

Universe ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 145
Author(s):  
Nikolay N. Arsenyev ◽  
Alexey P. Severyukhin
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Lower Energy ◽  
High Energy ◽  
Wave Functions ◽  
Low Energy ◽  
Phonon Coupling ◽  
Skyrme Interaction ◽  
Separable Approximation ◽  
Hole Interaction

Beginning with the Skyrme interaction, we study the properties of the isoscalar giant monopole resonances (ISGMR) of 132Sn. Using the finite-rank separable approximation for the particle-hole interaction, the coupling between one- and two-phonon terms in the wave functions of excited states is taken into account in very large configurational spaces. The inclusion of the phonon–phonon coupling (PPC) results in the formation of a low-energy 0+ state. The PPC inclusion leads to a fragmentation of the ISGMR strength to lower energy states and also to a higher energy tail. Using the same set of parameters, we describe the available experimental data for the ISGMR characteristics of 118,120,122,124Sn and give a prediction for 126,128,130,132Sn.

STUDIES OF THE ENERGY SPECTRUM AND THE WAVE FUNCTION FOR LOW ENERGY EXCITED STATES IN LIQUID HELIUM II

2007 ◽  
Vol 21 (21) ◽  
pp. 1383-1390
Author(s):  
DE-HUA LIN ◽  
PING ZOU ◽  
ZHONG-WEI ZHANG ◽  
HONG-LEI WANG ◽  
JUN PAN ◽  
...  
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Energy Spectrum ◽  
Liquid Helium ◽  
Excited States ◽  
Low Energy ◽  
Large Wave ◽  
Helium Ii ◽  
Wave Numbers ◽  
Specific Temperature

In this paper, we study the elementary excitations and energy spectrum proposed by L. D. Landau in liquid helium II. On the basis of the energy spectrum for the phonons and rotons, we put forward a uniform expression of energy spectrum in liquid helium II, which is limited in a specific temperature range. By using the wave function for low energy excited states proposed by R. P. Feynman or the modified one proposed by Feynman and Cohen, it can be found that the estimated energy spectrum is quite different from the experimental data, especially for the region with large wave numbers. By proposing an improved form for the wave function, we re-analyze the energy spectrum in liquid helium II, and our results show a better agreement with the experimental data.

scholarly journals Emerging Tunnel FET and Spintronics based Hardware Secure Circuit Design with Ultra-low Energy Consumption

2021 ◽  
Author(s):  
Aditya Japa ◽  
Subhendu K. Sahoo ◽  
Ramesh Vaddi ◽  
Manoj Kumar Majumder
Keyword(s):  
Energy Consumption ◽  
Lower Energy ◽  
High Energy ◽  
Spin Transfer Torque ◽  
Low Energy ◽  
Sense Amplifier ◽  
Tunnel Fet ◽  
Low Energy Consumption ◽  
Static Power ◽  
Channel Lengths

Abstract Present CMOS technology with scaled channel lengths exhibited higher energy consumption in designing secure electronic circuits against hardware vulnerabilities and breaches. Specifically, CMOS sense amplifier based secure differential power analysis (DPA) countermeasures at scaled channel lengths show large energy consumption with increased vulnerability. Additionally, spin transfer torque magnetic tunnel junction (STT-MTJ) and CMOS based logic-in-memory (LiM) cells demonstrate high energy consumption due to the large write current requirement of STT-MTJ and poor MOS device performance at scaled channel lengths. This paper for the first time leverages emerging tunnel FET (TFET) steep-slope device characteristics and compatible non-volatile STT-MTJ devices for enhanced hardware security with ultra-low energy consumption at lower supply voltages. TFET based sense amplifier based logic (SABL) gates have been proposed that achieve 3× lower energy consumption compared to Si FinFET SABL designs. Further, utilizing TFET SABL gates, TFET Pride S-box is designed that exhibits higher DPA resilience with 3.2× lower energy consumption compared to FinFET designs. With resulted lower static power consumption, TFET SABL based crypto systems can show lower vulnerability to static power side-channel attacks. Besides, proposed STT-MTJ and TFET LiM gates achieves 4× lower energy consumption compared to STT-MTJ and FinFET designs. Moreover, these gates have been explored in logic encryption/locking technique that shows 3.1× lower energy consumption compared to STT-MTJ and FinFET based design.

CALCULATING SPIN-DEPENDENT PARTON DISTRIBUTIONS IN THE BAG MODEL

2003 ◽  
Vol 18 (08) ◽  
pp. 1391-1395 ◽  
Author(s):  
A. I. SIGNAL
Keyword(s):  
Experimental Data ◽  
Nuclear Physics ◽  
Lower Energy ◽  
Valence Quark ◽  
High Energy ◽  
Nucleon Structure ◽  
Pion Cloud ◽  
Model Calculations ◽  
Parton Distributions

Model calculations of parton distributions are an important way to connect our knowledge of physics at high energy scales with physics at lower energy scales typical of nuclear physics. Earlier work on the spin-independent valence quark distributions has shown that DIS data support a bag radius around 0.8 fm, and highlighted the importance of chiral symmetry and the role of the pion cloud in nucleon structure. Here, that work is extended to the spin-dependent parton distributions. We calculate these distributions in the model and compare with experimental data.

Neutron Spectroscopy of Superconducting Fullerides

1992 ◽  
Vol 270 ◽  
Author(s):  
Kosmas Prassides ◽  
Christos Christides ◽  
John Tomkinson ◽  
Matthew J. Rosseinsky ◽  
D. W. Murphy ◽  
...  
Keyword(s):  
Low Temperatures ◽  
High Energy ◽  
Inelastic Neutron ◽  
Low Energy ◽  
Vibrational Modes ◽  
Phonon Coupling ◽  
Phonon Spectra ◽  
Electron Phonon Coupling ◽  
Wide Range ◽  
Mechanism Of Superconductivity

ABSTRACTThe phonon spectra of pristine fullerene, superconducting K3C60 and saturation-doped Rb6C60 measured by inelastic neutron scatteringin the energy range 2.5 - 200 meV at low temperatures reveal substantial broadening of five-fold degenerate Hg intramolecular vibrational modes both in the low-energy radial and the high-energy tangential part of the spectrum. This provides strong evidence for a traditional phonon-mediated mechanism of superconductivity in the fullerides but with an electron-phonon coupling strength distributed over a wide range of energies (33-195 meV) as a result of the finite curvature of the fullerene spherical cage.

RESONANT INELASTIC SOFT X-RAY SCATTERING OF INSULATING CUPRATES

2002 ◽  
Vol 09 (02) ◽  
pp. 1103-1108 ◽  
Author(s):  
L.-C. DUDA ◽  
T. SCHMITT ◽  
J. NORDGREN ◽  
G. DHALENNE ◽  
A. REVCOLEVSCHI
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Lower Energy ◽  
High Energy ◽  
Low Energy ◽  
The Novel ◽  
Excitation Peak ◽  
X Ray ◽  
X Ray Scattering ◽  
Large Spread

We have performed high-resolution inelastic X-ray emission scattering experiments at the Cu 3p-, Cu 3s-, and O 1s-resonances of the insulating cuprates CuGeO 3, CuO, La 2 CuO 4, and SrCuO 2. We introduce the novel low-energy s-edge Cu-RIXS which reveals a dd-excitation peak, which was previously unobserved due to insufficient resolution and intensity in high-energy (Cu 1s RIXS). Also, O 1s-RIXS of all cuprate sample is investigated. Surprisingly, there is a large spread in the energy loss values of the RIXS features for different compounds and we explain this by assigning the larger energy features to the occurrence of a Zhang–Rice singlet while the lower energy feature (only observed for CuGeO 3) is assigned to a dd-excitation.

scholarly journals QUARK STRUCTURE OF PSEUDOSCALAR MESONS

2000 ◽  
Vol 15 (02) ◽  
pp. 159-207 ◽  
Author(s):  
THORSTEN FELDMANN
Keyword(s):  
High Energy ◽  
Wave Functions ◽  
Low Energy ◽  
Mixing Process ◽  
Chiral Perturbation ◽  
Fock States ◽  
Mixing Parameters ◽  
Pseudoscalar Mesons ◽  
Energy Application ◽  
Quark Structure

I review to which extent the properties of pseudoscalar mesons can be understood in terms of the underlying quark (and eventually gluon) structure. Special emphasis is put on the progress in our understanding of η–η′ mixing. Process-independent mixing parameters are defined, and relations between different bases and conventions are studied. Both, the low-energy description in the framework of chiral perturbation theory and the high-energy application in terms of light-cone wave functions for partonic Fock states, are considered. A thorough discussion of theoretical and phenomenological consequences of the mixing approach will be given. Finally, I will discuss mixing with other states (π0, ηc, …).

Excitation of lithium atoms by electron impact

1983 ◽  
Vol 61 (1) ◽  
pp. 1-5
Author(s):  
P. S. Ganas
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Excited States ◽  
Cross Sections ◽  
Born Approximation ◽  
Wave Functions ◽  
Oscillator Strengths ◽  
Central Potential ◽  
Generalized Oscillator ◽  
Comparison Of The Results

A realistic analytic central potential is used to generate wave functions for the ground and excited states of lithium. Generalized oscillator strengths and integrated cross sections from threshold up to 5 keV are calculated in the Born approximation for 2s–ns, 2s–np and 2s–nd excitations. Comparison of the results with experimental data is discussed.

scholarly journals Pairing and (9/2)n configuration in nuclei in the 208Pb region

2018 ◽  
Vol 177 ◽  
pp. 03004
Author(s):  
M. Stepanov ◽  
L. Imasheva ◽  
B. Ishkhanov ◽  
T. Tretyakova
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Ground State ◽  
Exotic Nuclei ◽  
Low Energy ◽  
Energy Spectra ◽  
Pairing Energy ◽  
Multiplet Splitting ◽  
Wide Range ◽  
Nuclear Masses

Excited states in low-energy spectra in nuclei near 208Pb are considered. The pure (j = 9/2)n configuration approximation with delta-force is used for ground state multiplet calculations. The multiplet splitting is determined by the pairing energy, which can be defined from the even-odd straggering of the nuclear masses. For the configurations with more than two valence nucleons, the seniority scheme is used. The results of the calculations agree with the experimental data for both stable and exotic nuclei within 0.06-6.16%. Due to simplicity and absence of the fitted parameters, the model can be easily applied for studies of nature of the excited states in a wide range of nuclei.

COLLECTIVE QUADRUPOLE EXCITATIONS WITHIN A SELF-CONSISTENT APPROACH

2006 ◽  
Vol 15 (02) ◽  
pp. 379-386 ◽  
Author(s):  
L. PRÓCHNIAK
Keyword(s):  
Experimental Data ◽  
Degrees Of Freedom ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Low Energy ◽  
Time Dependent ◽  
Collective Excitations ◽  
Skyrme Interaction ◽  
Self Consistent ◽  
Consistent Approach

Low energy quadrupole collective excitations are investigated using a model based on the Adiabatic Time Dependent HFB theory. Distinctive feature of proposed method is an extension of the collective space by adding variables referring to pairing degrees of freedom. In the microscopic part of the model effective Skyrme interaction and constant G pairing force are employed. Calculated energy levels and B(E2) transition probabilities in the 128 Xe nucleus are compared with the experimental data.

Puzzle for the existence of 3α + N structure in A=13 system

2006 ◽  
Vol 21 (31n33) ◽  
pp. 2411-2417 ◽  
Author(s):  
Mamoru Fujiwara ◽  
Hisako Fujimura
Keyword(s):  
Excited States ◽  
High Energy ◽  
Branching Ratios ◽  
Wave Functions ◽  
Direct Reaction ◽  
View Point ◽  
Intermediate Energies ◽  
Zero Degree ◽  
Bombarding Energy ◽  
Gamow Teller

Spin-isospin excitations in 13 N have been studied by means of the (3 He ,t) and (3 He ,tp) reactions at the bombarding energy of E(3 He ) = 450 MeV . The zero-degree (3 He ,t) spectrum is found to be similar to those from the (p,n) reactions at intermediate energies, suggesting a simple direct reaction mechanism at E(3 He ) = 450 MeV . Three pairs of Gamow-Teller (GT) states with Jπ = 1/2- and 3/2- have been strongly excited at θlab. = 0°. Microscopic structures of the states in 13 N have been studied by observing decay protons in coincidence with high energy tritons measured at θlab. = 0°. The branching ratios for proton decay from the GT states in 13 N to the final low-lying T =0 states in 12 C were obtained. The wave functions of the excited states in 13 N are discussed in the view point of α cluster model.

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