Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Application of the cranked Nilsson model in some light nuclei : The super backbend in 11B and 11C?

Ragnarsson, I. LU ; Åberg, S. LU ; Hakansson, H. B. and Sheline, R. K. (1981) In Nuclear Physics, Section A 361(1). p.1-22
Abstract

The Nilsson model of high-spin states is developed to include particle-hole excitations for rotation around an arbitrary axis. Potential-energy surfaces are calculated with constraints not only on the total spin but also on parity and signature. The method is applied to very light nuclei with A ~ 10. Good agreement for the ground-state bands of 8Be and 12C is obtained and predictions are made for the excitation energy of higher-spin states (I {greater-than or approximate} 4) of positive and negative parity. It is pointed out how the "positive-parity yrast levels" of 11B and 11C form a rotational band with a very small rotational parameter. When taken in conjunction with the much larger... (More)

The Nilsson model of high-spin states is developed to include particle-hole excitations for rotation around an arbitrary axis. Potential-energy surfaces are calculated with constraints not only on the total spin but also on parity and signature. The method is applied to very light nuclei with A ~ 10. Good agreement for the ground-state bands of 8Be and 12C is obtained and predictions are made for the excitation energy of higher-spin states (I {greater-than or approximate} 4) of positive and negative parity. It is pointed out how the "positive-parity yrast levels" of 11B and 11C form a rotational band with a very small rotational parameter. When taken in conjunction with the much larger rotational constants of the negative-parity bands, this can be interpreted in terms of a super backbend. We discuss the possible association of these positive-parity bands with a calculated potential-energy minimum at a large prolate deformation which for positive parity develops already at low spins. Special attention is paid to the question of signature splitting.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nuclear Physics, Section A
volume
361
issue
1
pages
22 pages
publisher
Elsevier
external identifiers
  • scopus:0001917610
ISSN
0375-9474
DOI
10.1016/0375-9474(81)90468-1
language
English
LU publication?
yes
id
3d8255c7-8d07-48aa-9d01-1fbe0463e1cc
date added to LUP
2025-09-02 14:56:36
date last changed
2025-09-03 09:19:03
@article{3d8255c7-8d07-48aa-9d01-1fbe0463e1cc,
  abstract     = {{<p>The Nilsson model of high-spin states is developed to include particle-hole excitations for rotation around an arbitrary axis. Potential-energy surfaces are calculated with constraints not only on the total spin but also on parity and signature. The method is applied to very light nuclei with A ~ 10. Good agreement for the ground-state bands of <sup>8</sup>Be and <sup>12</sup>C is obtained and predictions are made for the excitation energy of higher-spin states (I {greater-than or approximate} 4) of positive and negative parity. It is pointed out how the "positive-parity yrast levels" of <sup>11</sup>B and <sup>11</sup>C form a rotational band with a very small rotational parameter. When taken in conjunction with the much larger rotational constants of the negative-parity bands, this can be interpreted in terms of a super backbend. We discuss the possible association of these positive-parity bands with a calculated potential-energy minimum at a large prolate deformation which for positive parity develops already at low spins. Special attention is paid to the question of signature splitting.</p>}},
  author       = {{Ragnarsson, I. and Åberg, S. and Hakansson, H. B. and Sheline, R. K.}},
  issn         = {{0375-9474}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{1}},
  pages        = {{1--22}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Physics, Section A}},
  title        = {{Application of the cranked Nilsson model in some light nuclei : The super backbend in <sup>11</sup>B and <sup>11</sup>C?}},
  url          = {{http://dx.doi.org/10.1016/0375-9474(81)90468-1}},
  doi          = {{10.1016/0375-9474(81)90468-1}},
  volume       = {{361}},
  year         = {{1981}},
}