scholarly journals Goodness of Generalized Seniority in Even-even Sn Isotopes.

2019 ◽  
Vol 6 (2) ◽  
pp. 147-154
Author(s):  
Bhoomika Maheshwari
Keyword(s):  
Nuclear Structure ◽  
Quantum Number ◽  
Excited States ◽  
High Spin ◽  
Magic Numbers ◽  
Selection Rules ◽  
Good Quantum Number ◽  
Spin Isomers ◽  
Configuration Mixing

Seniority has proved to be a unique and simple probe to address some of the complex issues underlying nuclear structure of nuclei close to magic numbers. An extension from the concept of seniority in single-j shell to generalized seniority in multi-j shell has recently been provided by us. We have, consequently, established new selection rules for gamma decays and discovered the new seniority isomers decaying via odd electric multipole operators. We have successfully explained the B(EL; L=1,2,3) behavior of various high spin isomers and other excited states. More specifically, we have been able to explain the long-standing puzzle of double hump in the B(E2) values for the first excited 2+ states of even-even Z=50 (Sn) isotopes. In the present paper, we review these generalized seniority calculations with emphasis on even-even Sn isotopes. We first discuss the generalized seniority results for the E1 decaying 13- isomers and E2 decaying 10+, 15- isomers, and then present the cases of first-excited 2+ and 3- states. The generalized seniority proves out to be a reasonably good quantum number. The significance of configuration mixing is found to be true. The calculated results has been validated till high seniority v=4 states and expected to be valid for higher seniority v=6,… states also.  

HIGH SPIN ISOMERS IN 153Er

1980 ◽  
Vol 41 (C10) ◽  
pp. C10-39-C10-42 ◽  
Author(s):  
D. Horn ◽  
G. R. Young ◽  
C. J. Lister ◽  
C. Baktash
Keyword(s):  
High Spin ◽  
Spin Isomers

Low- and high-spin excited states inPr139

1988 ◽  
Vol 37 (5) ◽  
pp. 1855-1869 ◽  
Author(s):  
R. Aryaeinejad ◽  
Wm. C. McHarris
Keyword(s):  
Excited States ◽  
High Spin

scholarly journals Role of theZ= 64 Core Excitation in High-Spin Isomers in Proton-RichN∼82 Nuclei

2002 ◽  
Vol 146 ◽  
pp. 595-596 ◽  
Author(s):  
Takayuki Matsuzawa ◽  
Hitoshi Nakada ◽  
Kengo Ogawa
Keyword(s):  
High Spin ◽  
Core Excitation ◽  
Spin Isomers

Description of high-spin isomers in theN=82 region

1980 ◽  
Vol 296 (3) ◽  
pp. 237-250 ◽  
Author(s):  
Amand Faessler ◽  
M. Ploszajczak
Keyword(s):  
High Spin ◽  
Spin Isomers

Excited states and selection rules in self-assembled InAs/GaAs quantum dots

1999 ◽  
Vol 60 (4) ◽  
pp. R2185-R2188 ◽  
Author(s):  
I. E. Itskevich ◽  
M. S. Skolnick ◽  
D. J. Mowbray ◽  
I. A. Trojan ◽  
S. G. Lyapin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Excited States ◽  
Selection Rules ◽  
Self Assembled

scholarly journals High Spin States in 193Hg

2020 ◽  
Vol 4 ◽  
pp. 170
Author(s):  
N. Fotiades ◽  
Et al.
Keyword(s):  
Excited States ◽  
High Spin ◽  
Normal Level ◽  
Beam Energy ◽  
Spin Structure ◽  
Spin States ◽  
Tandem Accelerator ◽  
High Spin States ◽  
Γ Rays ◽  
Γ Ray

The high-spin structure of 193Hg was investigated by in-beam γ-ray spectro­scopic techniques. The tandem accelerator at Daresbury Laboratory, U. K., was used to populate excited states of 193Hg through the reaction 150Nd(48Ca,5n)193Hg at a beam energy of 213 MeV and the EUROGAM detector array was used to de­ tect the γ-rays emitted by the deexciting nuclei. The normal level scheme has been further extended and a new band has been observed. In addition two new ΔI=1 structures of competing dipole and quadrupole transitions were found which will be discussed in detail.

C. Coordination compounds - The effect of ring size and conformation on the rotatory strength of tris-(bidentate) complexes

1967 ◽  
Vol 297 (1448) ◽  
pp. 79-87 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Excited States ◽  
Lower Energy ◽  
Optically Active ◽  
Oscillator Strengths ◽  
Molecular Vibration ◽  
Selection Rules ◽  
Simultaneous Excitation ◽  
Typical Appearance ◽  
Upper Level

In the following we shall be concerned with a part of the optically active behaviour of the chromophore. With N being the nitrogen atom of ammonia this chromophore is, of course, optically inactive. Its absorption spectrum consists of two bands in the visible which e. g. for M = Co(III) are attributed to transitions from a ground state, 1 A 1 g , to excited states, 1 T 1 g , and 1 T 2 g . ϵ amounts to between 50 and 100 corresponding to oscillator strengths of ca . 10 -3 formal electron in spite of the fact that the tran­sitions are electronically forbidden. This intensity is, I believe, not too well under­stood in detail but is generally ascribed to the simultaneous excitation of suitable molecular vibration (Moffitt 1956). The transition at lower energy ( 1 A 1 g → 1 T 1 g is magnetically allowed, whereas the 1 A 1 g → 1 T 2 g transition at higher energy is magnetically forbidden (Moffitt 1956). The typical appearance of the absorption spectrum is shown in figure 1. (Similar selection rules apply to Cr(III) and Rh(III).) If the nitrogen atoms are connected in pairs as in a tris-(diamine) chelate the symmetry elements of the second order disappear and the chromophore becomes optically active. The upper level of each of the transitions mentioned splits under the trigonal field into a doubly degenerate E and a non-degenerate A level, but the splitting is quite small, and I think it is only fair to say that in general we know neither its magnitude nor its sign, although the beautiful crystal circular dichroism measurements by Professor Mason and his co-workers (Ballard, McCaffery & Mason 1962; McCaffery & Mason 1963) seem to show that for the tris-(ethylene-diamine) cobalt (III) ion the sign of the splitting is as indicated in figure 1. In ac­cordance with the smallness of the splitting its spectral effects are quite small, and the selection rules remain almost intact as shown by the fact that the intensity of the absorption increases by less than 100% when ammonia is replaced by a chelating diamine.

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