Semiclassical description of high-spin states in rotational bands

High spin states in 155Dy have been studied by γ-γ coincidence measurements via the 124Sn(36S, 5n)155Dy reaction at a beam energy of 155 MeV. Eight rotational bands have been populated and observed up to high spin (I<91/2).The band features have been analysed within the framework of the cranked shell model. The Ì13/2 neutron alignments and the h11/2 proton alignments are discussed. B(M1)/B(E2) ratios have also been extracted for the strongly coupled bands to deduce further information on the detailed structure of these bands. For the highest states (above spin 30) of the negative parity bands an irregularity in y-ray energies appears which is discussed in terms of band termination.

Download Full-text

High Spin States in the Odd–Odd 150Eu Nucleus

International Journal of Modern Physics A ◽

10.1142/s0217751x97001547 ◽

1997 ◽

Vol 12 (16) ◽

pp. 2791-2808 ◽

Cited By ~ 1

Author(s):

J. M. Chatterjee ◽

Somapriya Basu ◽

U. Datta Pramanik ◽

S. Bhattacharya ◽

R. K. Chattopadhyay ◽

...

Keyword(s):

High Spin ◽

Positive Parity ◽

Spin States ◽

Phonon Coupling ◽

Axially Symmetric ◽

Rotational Bands ◽

Isomeric Level ◽

High Spin States ◽

Symmetric Rotor ◽

Rotor Core

High spin rotational bands in the odd–odd 150Eu nucleus, produced in the 148Nd(7Li,5n) reaction, were investigated by in-beam γ spectroscopy. Seven bands above the 588.8 keV (45 ns) isomeric level were observed. Probable single- and double-octupole-phonon coupling states were identified. Two positive parity bands are interpreted in terms of two quasiparticles (a proton and a neutron) coupled to an axially symmetric rotor core. Otherwise, the rest of the high spin levels are described by multiparticle–hole excitations.

Download Full-text

OBSERVATION OF FOUR-QUASIPARTICLE BAND AND SIGNATURE SPLITTING FEATURES IN 160Tm

International Journal of Modern Physics E ◽

10.1142/s0218301308011720 ◽

2008 ◽

Vol 17 (supp01) ◽

pp. 21-28 ◽

Cited By ~ 2

Author(s):

J. B. LU ◽

D. YANG ◽

L. SUN ◽

L. L. WANG ◽

H. D. WANG ◽

...

Keyword(s):

High Spin ◽

Gamma Ray ◽

Spin States ◽

Signature Splitting ◽

Rotational Bands ◽

High Spin States ◽

Gamma Ray Spectroscopy ◽

Quasiparticle Band

High-spin states of 160 Tm are studied via in-beam gamma-ray spectroscopy. Previously known rotational bands are confirmed. These bands feed into low-lying states which are enriched in this work. A four-quasiparticle band with configuration of πg7/2 ⊗ νh9/2 ⊗ ν(i13/2)2 is established. Signature splitting features of πh11/2⊗νi13/2 and πh11/2⊗νh9/2 bands are presented.

Download Full-text

High-Spin States inCa41:K=32+andK=32−Rotational Bands?

Physical Review Letters ◽

10.1103/physrevlett.31.552 ◽

1973 ◽

Vol 31 (8) ◽

pp. 552-555 ◽

Cited By ~ 19

Author(s):

Kamal K. Seth ◽

A. Saha ◽

L. Greenwood

Keyword(s):

High Spin ◽

Spin States ◽

Rotational Bands ◽

High Spin States

Download Full-text

Evidence for tetrahedral structure of Calcium-40

International Journal of Modern Physics E ◽

10.1142/s0218301320500184 ◽

2020 ◽

Vol 29 (04) ◽

pp. 2050018

Author(s):

N. S. Manton

Keyword(s):

Excited States ◽

High Spin ◽

Vibrational Frequency ◽

Spin States ◽

Tetrahedral Structure ◽

Rotational Bands ◽

High Spin States ◽

Vibrational Bands ◽

Almost All

More than 100 excited states of the Calcium-40 nucleus, with isospin 0, are classified into rotational–vibrational bands of an intrinsic tetrahedral structure. Almost all observed states below 8[Formula: see text]MeV can be accommodated, as well as many high-spin states above 8[Formula: see text]MeV. The bands have some similarity to those classifying states of Oxygen-16, but the A-mode vibrational frequency is lower relative to the E-mode and F-mode frequencies than in Oxygen-16. Previously identified rotational bands up to spin 16 and energy above 20[Formula: see text]MeV are unified here into a smaller number of tetrahedral bands.

Download Full-text