scholarly journals Shape phase changes with N in 72−84Kr isotopes

2020 ◽  
Vol 29 (09) ◽  
pp. 2030008
Author(s):  
J. B. Gupta ◽  
J. H. Hamilton
Keyword(s):  
Large Deformation ◽  
Quadrupole Deformation ◽  
Phase Changes ◽  
Spectral Features ◽  
Band Structures ◽  
Nuclear Core ◽  
Nuclear Interactions ◽  
Specific Formula ◽  
Striking Contrast

The Kr isotopes lying in between the lighter isotopes of (Zn, Ge and Se) and the heavier isotopes of (Sr and Zr) in the [Formula: see text]–80 region exhibit very interesting spectral features. The spectra of [Formula: see text]Kr isotopes display a striking contrast from those of Zn, Ge and Se isotopes. The role of spherical and oblate and prolate deformed subshell gaps at specific [Formula: see text] and [Formula: see text] and the resulting re-inforcement are strikingly evident in these contrasting features, with variation in [Formula: see text] or [Formula: see text]. The evolution of the spectral features in Kr isotopes with [Formula: see text] as reflected in the quadrupole deformation, [Formula: see text]-band structures, [Formula: see text]0 decay, [Formula: see text]2) values, [Formula: see text]-softness of the nuclear core and odd–even staggering in [Formula: see text]-bands is studied to explore the role of the under lying nuclear interactions. The correlations with odd–[Formula: see text] isotopes are explored. The shape co-existence displayed in some Kr isotopes is studied. The large deformation observed in the ground bands of [Formula: see text]Kr, as exhibited in the [Formula: see text]2) values, is especially interesting.

Role of triaxiality parameter γ in deformed nuclei

2020 ◽  
Vol 29 (06) ◽  
pp. 2050037
Author(s):  
J. B. Gupta
Keyword(s):  
Intimate Relationship ◽  
Quadrupole Deformation ◽  
Spectral Features ◽  
Usual Practice ◽  
Deformed Nuclei ◽  
Variable Formula ◽  
Unified View ◽  
The Absolute ◽  
Relationship Of

The well known, one-parameter Davydov–Filippov model (DFM) or its variants have been used often to study the inter band [Formula: see text]-g B(E2) ratios for the triaxially deformed nuclei. Here, its application for the axially deformed nuclei with [Formula: see text] less than [Formula: see text] is illustrated, which has not received attention so far. Instead of the usual practice of studying the gamma-ground B(E2) ratios, we focus on the absolute B(E2) values in DFM. It offers a wholly new role of the [Formula: see text]-variable in explaining the spectral features of the axially deformed nuclei. Further, it illustrates the intimate relationship of the [Formula: see text] variable and the quadrupole deformation variable [Formula: see text]. Additionally, a unified view of the various differing patterns of the variation of the [Formula: see text]-g B(E2) ratios versus [Formula: see text] is presented.

Effect of somatostatin on circadian rhythms of firing and 2-deoxyglucose uptake in rat suprachiasmatic slices

1993 ◽  
Vol 265 (5) ◽  
pp. R1199-R1204 ◽  
Author(s):  
T. Hamada ◽  
S. Shibata ◽  
A. Tsuneyoshi ◽  
K. Tominaga ◽  
S. Watanabe
Keyword(s):  
Circadian Rhythm ◽  
Vasoactive Intestinal Polypeptide ◽  
Phase Changes ◽  
Circadian Clocks ◽  
Constant Darkness ◽  
Phase Resetting ◽  
Firing Activity ◽  
Light Pulses ◽  
Circadian Time

In mammals, the suprachiasmatic nucleus (SCN) of the hypothalamus appears to act as a circadian clock. The SCN vasoactive intestinal polypeptide-like immunoreactive neurons, which may act to mediate photic information in the SCN, receive input from neurons immunoreactive for somatostatin (SST). Therefore we investigated the role of SST as a transmitter for entrainment by analyzing the phase-resetting effect of SST on the circadian rhythm of SCN firing activity. Perfusion of SST increased 2-deoxyglucose uptake at circadian time (CT) 18, but not at CT6. A 1-h or 15-min treatment with SST produced phase delays when it was administered at CT13-14 and phase advances at CT22-23. Thus SST-induced phase changes are similar to those for light pulses to animals under constant darkness. The present findings suggest that SST is a transmitter for mediating information of entrainment to circadian clocks within the SCN.

New insights into the protogenic and spectroscopic properties of commercial tannic acid: the role of gallic acid impurities

2018 ◽  
Vol 42 (10) ◽  
pp. 7703-7712 ◽  
Author(s):  
G. Ghigo ◽  
S. Berto ◽  
M. Minella ◽  
D. Vione ◽  
E. Alladio ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Tannic Acid ◽  
Spectroscopic Properties ◽  
Spectral Features

Assessment of a protonation model for tannic acid and characterization of the spectral features of its protonated and dissociated species.

Role of the Crystal Lattice Constants and Band Structures in the Optoelectronic Spectra of CdGa2S4by DFT Approaches

2017 ◽  
Vol 643 (13) ◽  
pp. 839-849 ◽  
Author(s):  
H. A. Rahnamaye Aliabad ◽  
Hamide Vaezi ◽  
Shiva Basirat ◽  
Iftikhar Ahmad
Keyword(s):  
Crystal Lattice ◽  
Band Structures ◽  
Lattice Constants

scholarly journals In search of a pristine signal for (scale-)chiral symmetry in nuclei

2017 ◽  
Vol 26 (01n02) ◽  
pp. 1740023 ◽  
Author(s):  
Mannque Rho
Keyword(s):  
Chiral Symmetry ◽  
Nuclear Physics ◽  
Local Symmetry ◽  
Point Interaction ◽  
Strongly Correlated ◽  
Scale Invariant ◽  
Unpublished Note ◽  
Nuclear Interactions ◽  
Vector Formula

I describe the long-standing search for a “smoking-gun” signal for the manifestation of (scale-)chiral symmetry in nuclear interactions. It is prompted by Gerry Brown’s last unpublished note, reproduced verbatim below, on the preeminent role of pions and vector ([Formula: see text]) mesons in providing a simple and elegant description of strongly correlated nuclear interactions. In this note written in tribute to Gerry Brown, I first describe a case of an unambiguous signal in axial-charge transitions in nuclei and then combine his ideas with the more recent development on the role of hidden symmetries in nuclear physics. What transpires is the surprising conclusion that the Landau–Migdal fixed point interaction [Formula: see text], the nuclear tensor forces and Brown–Rho scaling, all encoded in scale-invariant hidden local symmetry, as Gerry put, “run the show and make all forces equal.”

scholarly journals The van der Waals interactions in rare-gas dimers: the role of interparticle interactions

2016 ◽  
Vol 18 (4) ◽  
pp. 3011-3022 ◽  
Author(s):  
Yu-Ting Chen ◽  
Kerwin Hui ◽  
Jeng-Da Chai
Keyword(s):  
Potential Energy ◽  
Van Der Waals ◽  
Van Der Waals Interactions ◽  
Potential Energy Curves ◽  
Rare Gas ◽  
Interparticle Interactions ◽  
Nuclear Interactions

We investigate the potential energy curves of rare-gas dimers with various ranges and strengths of interparticle interactions (nuclear–electron, electron–electron, and nuclear–nuclear interactions).

Spectroscopic characterization of free-base hydroxy(arylethynyl)porphyrins in acidic and basic media

2017 ◽  
Vol 21 (10) ◽  
pp. 680-691
Author(s):  
Kaarin K. Evens ◽  
Kathryn E. Splan
Keyword(s):  
Spectroscopic Characterization ◽  
Spectral Features ◽  
Free Base ◽  
Enhanced Absorption ◽  
Spectral Shifts ◽  
Porphyrin Macrocycle ◽  
Show Evidence ◽  
Acidic Conditions

The addition of arylethynyl groups to the porphyrin macrocycle represents an effective strategy with which to enhance the light-harvesting properties of porphyrins. We now extend this modification to arylethynyl porphyrins with two or four [Formula: see text]-hydroxyphenyl substituents. Arylethynyl porphyrins bearing four, but not two, [Formula: see text]-hydroxyphenyl substituents show evidence of aggregation under acidic conditions. Under basic conditions, deprotonation of the peripheral hydroxyphenyl substituents results in substantially red-shifted spectral features and enhanced absorption in the Q-band region. When the hydroxyphenyl groups are appended to the porphyrin macrocylce via the ethynyl spacers, the spectral shifts observed upon deprotonation are significantly enhanced relative to those observed for hydroxyphenylporphyrins, highlighting the role of expanded conjugation in altering porphyrin photophysics.

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