A New Type of Band Crossing at Large Deformation

Forskningsoutput: TidskriftsbidragLetter


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.


  • A. Harder
  • K. P. Lieb
  • R. Cunningham
  • W. Gelletly
  • C. J. Gross
  • F. Hannachi
  • M. K. Kabadiyski
  • H. A. Roth
  • Dirk Rudolph
  • J. Simpson
  • O. Skeppstedt
  • B. J. Varley
  • D. D. Warner
Externa organisationer
  • External Organization - Unknown

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Sidor (från-till)277-282
TidskriftPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Utgåva nummer4
StatusPublished - 1996
Peer review utfördJa