8,483 research outputs found
A global study of -clusters decay in heavy and superheavy nuclei with half-life and preformation factor
A detailed study of -clusters decay is exhibited by incorporating
crucial microscopic nuclear structure information into the estimations of
half-life and preformation factor. For the first time, using the k-cross
validation approach, two semi-empirical formulas for (i) -decay
half-life and (ii) -particle preformation factor, are picked out and
subsequently modified by including shell, odd-nucleon blocking, and asymmetry
effects along with the usual dependence on -decay energy ()
and angular momentum of -particle. Both the formulas are fitted for the
two different regions separated by neutron number N126, as from the
experimental systematics the role of N126 shell closure is found decisive in
determining the trends of , -decay half-life, and
-particle preformation factor. It is found that the inclusion of the
above-mentioned degrees of freedom significantly reduces the errors in the
estimations when compared with several other similar modified/refitted
semi-empirical relations indicating the robustness of the proposed formulas.
The predictions of -decay half-life throughout the periodic chart have
been made including the unknown territory, future probable decay chain of
self-conjugate nucleus Ba terminated on Sn, decay chain of
Pa through new isotope Ac as well as decay chains of awaiting
superheavy nuclei Og and 120.Comment: 13 pages, 7 Figures, Accepted in European Physical Journal A (2024
Two photon annihilation operators and squeezed vacuum
Inverses of the harmonic oscillator creation and annihilation operators by their actions on the number states are introduced. Three of the two photon annihilation operators, viz., a(sup +/-1)a, aa(sup +/-1), and a(sup 2), have normalizable right eigenstates with nonvanishing eigenvalues. The eigenvalue equation of these operators are discussed and their normalized eigenstates are obtained. The Fock state representation in each case separates into two sets of states, one involving only the even number states while the other involving only the odd number states. It is shown that the even set of eigenstates of the operator a(sup +/-1)a is the customary squeezed vacuum S(sigma) O greater than
Two-Proton Radioactivity with 2p halo in light mass nuclei A1834
Two-proton radioactivity with 2p halo is reported theoretically in light mass
nuclei A 18-34. We predict Mg, Si, S, Ar and
Ca as promising candidates of ground state 2p-radioactivity with
S 0. Observation of extended tail of spatial
charge density distribution, larger charge radius and study of proton single
particle states, Fermi energy and the wave functions indicate 2p halo like
structure which supports direct 2p emission. The Coulomb and centrifugal
barriers in experimentally identified 2p unbound Si show a quasi-bound
state that ensures enough life time for such experimental probes. Our
predictions are in good accord with experimental and other theoretical data
available so far.Comment: 5 Pages, 5 figure
Localized structures in Kagome lattices
We investigate the existence and stability of gap vortices and multi-pole gap
solitons in a Kagome lattice with a defocusing nonlinearity both in a discrete
case and in a continuum one with periodic external modulation. In particular,
predictions are made based on expansion around a simple and analytically
tractable anti-continuum (zero coupling) limit. These predictions are then
confirmed for a continuum model of an optically-induced Kagome lattice in a
photorefractive crystal obtained by a continuous transformation of a honeycomb
lattice
ROLE OF TERMINALIA ARJUNA IN ISCHEMIC HEART DISEASE (HRIDAROGA): A REVIEW
Now days, life is becoming very stressful and fast. As many diseases originate due to this hectic lifestyle. One of the important disease is Hridaroga (Ischemic heart disease), which is responsible for many deaths in early age. In Ayurveda, Hridaroga & their symptoms are described in many textbooks. Management of Hridaroga is also very critical and important. In modern medicine, only expensive interventional procedures are described but on the other hand, Ayurvedic herbs are better, cost effective & good therapeutic option for IHD (Hridaroga).
The review emphasizes on various properties of Terminalia arjuna. Many clinical & animal studies on T.arjuna show its effect on ECG changes, LV functions & myocardial ischaemic reperfusion injury-etc. Besides this it also has antiatherosclerotic, anticoagulant, anti-infarction, hypolipidemic & hypotensive properties. So, Ayurvedic drug (T. arjuna) is a better option for the treatment of IHD (Hridaroga) because it can improve the quality of life in individuals & potentially save millions of lives
Chaetotaxy of three nymphal instars of an ischnoceran louse, Aegypoecus perspicuus (Phthiraptera: Insecta)
The present study on three nymphal instars of Aegypoecus perspicuus indicated that these differ from each other not only an size, abdominal segmentation, chitinization but also in the number of setae occurring on head, thorax and abdomen. The study also supplements informations regarding the morphological features and chaetotaxy of three nymphal instars of A. perspicuus, occurring on Neophron percnopterus. The diagnostic features of three nymphal instars have also been discussed
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