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A New Type of Band Crossing at Large Deformation

Harder, A.; Lieb, K. P.; Cunningham, R.; Gelletly, W.; Gross, C. J.; Hannachi, F.; Kabadiyski, M. K.; Roth, H. A.; Rudolph, Dirk LU and Simpson, J., et al. (1996) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 374(4). p.277-282
Abstract
A detailed study of the positive parity yrast and yrare rotational bands in Rb-77 is presented. Using the reaction Ca-40(Ca-40,3p) and the EUROGAM I spectrometer, gamma gamma gamma coincidences enabled us to follow both bands over a large spin range and to measure many E2 strengths. The moments of inertia and transition quadrupole moments indicate that a more deformed band (epsilon(2) approximate to 0.38) is crossed by a less deformed one (epsilon(2) approximate to 0.29), Since the yrare band starts at the extremely low spin value of I = 9/2, the conventional band crossing mechanism of two aligning high-j quasiparticles is excluded. The frequency-dependent equilibrium shapes were calculated with Nilsson-Strutinsky type calculations using a... (More)
A detailed study of the positive parity yrast and yrare rotational bands in Rb-77 is presented. Using the reaction Ca-40(Ca-40,3p) and the EUROGAM I spectrometer, gamma gamma gamma coincidences enabled us to follow both bands over a large spin range and to measure many E2 strengths. The moments of inertia and transition quadrupole moments indicate that a more deformed band (epsilon(2) approximate to 0.38) is crossed by a less deformed one (epsilon(2) approximate to 0.29), Since the yrare band starts at the extremely low spin value of I = 9/2, the conventional band crossing mechanism of two aligning high-j quasiparticles is excluded. The frequency-dependent equilibrium shapes were calculated with Nilsson-Strutinsky type calculations using a diabatic tracing of configurations near the neutron Fermi level, This is the first observation of such a band crossing. (Less)
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Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
374
issue
4
pages
277 - 282
publisher
Elsevier
external identifiers
  • scopus:0010990618
ISSN
0370-2693
DOI
10.1016/0370-2693(96)00184-0
language
English
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no
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4ecef4db-f7fa-4e47-8ef5-7deb1f188f01 (old id 3963865)
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http://www.sciencedirect.com/science/article/pii/0370269396001840
date added to LUP
2013-08-13 18:21:56
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@article{4ecef4db-f7fa-4e47-8ef5-7deb1f188f01,
  abstract     = {A detailed study of the positive parity yrast and yrare rotational bands in Rb-77 is presented. Using the reaction Ca-40(Ca-40,3p) and the EUROGAM I spectrometer, gamma gamma gamma coincidences enabled us to follow both bands over a large spin range and to measure many E2 strengths. The moments of inertia and transition quadrupole moments indicate that a more deformed band (epsilon(2) approximate to 0.38) is crossed by a less deformed one (epsilon(2) approximate to 0.29), Since the yrare band starts at the extremely low spin value of I = 9/2, the conventional band crossing mechanism of two aligning high-j quasiparticles is excluded. The frequency-dependent equilibrium shapes were calculated with Nilsson-Strutinsky type calculations using a diabatic tracing of configurations near the neutron Fermi level, This is the first observation of such a band crossing.},
  author       = {Harder, A. and Lieb, K. P. and Cunningham, R. and Gelletly, W. and Gross, C. J. and Hannachi, F. and Kabadiyski, M. K. and Roth, H. A. and Rudolph, Dirk and Simpson, J. and Skeppstedt, O. and Varley, B. J. and Warner, D. D.},
  issn         = {0370-2693},
  language     = {eng},
  number       = {4},
  pages        = {277--282},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {A New Type of Band Crossing at Large Deformation},
  url          = {http://dx.doi.org/10.1016/0370-2693(96)00184-0},
  volume       = {374},
  year         = {1996},
}