Pair Excitations and a Proton Band Crossing in Superdeformed <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Gd</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>150</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

P. Fallon; C. W. Beausang; S. Clarke; P. J. Twin; F. A. Beck; Th. Byrski; D. Curien; P. J. Dagnall; G. deFrance; G. Duchêne; P. D. Forsyth; B. Haas; M. J. Joyce; A. O. Macchiavelli; E. S. Paul; J. F. Sharpey-Schafer; J. Simpson; J. P. Vivien; S. Åberg; W. Nazarewicz

doi:10.1103/PhysRevLett.73.782

Pair Excitations and a Proton Band Crossing in Superdeformed ${}^{150}{Gd}$

P. Fallon, C. W. Beausang, S. Clarke, P. J. Twin, F. A. Beck, Th. Byrski, D. Curien, P. J. Dagnall, G. deFrance, G. Duchêne, P. D. Forsyth, B. Haas, M. J. Joyce, A. O. Macchiavelli, E. S. Paul, J. F. Sharpey-Schafer, J. Simpson, J. P. Vivien, S. Åberg, and W. Nazarewicz

Phys. Rev. Lett. 73, 782 – Published 8 August 1994

Abstract

An excited superdeformed (SD) band in ${}^{150}{Gd}$ is associated with a two-particle-two-hole proton excitation and provides the first evidence for collective proton pair excitations in a SD nucleus. This band is seen to exhibit a discontinuity in the $γ$ -ray transition energies (backbending), which is interpreted as a band crossing associated with the alignment of a pair of $N = 6$ protons. There is further evidence that this excited SD band decays into the yrast SD band.

Received 4 February 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.782

Authors & Affiliations

P. Fallon¹, C. W. Beausang², S. Clarke², P. J. Twin², F. A. Beck³, Th. Byrski³, D. Curien³, P. J. Dagnall², G. deFrance³, G. Duchêne³, P. D. Forsyth², B. Haas³, M. J. Joyce², A. O. Macchiavelli¹, E. S. Paul², J. F. Sharpey-Schafer², J. Simpson⁴, J. P. Vivien³, S. Åberg⁵, and W. Nazarewicz^6,7,*

¹Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
²Oliver Lodge Laboratory, University of Liverpool, L69 3BX, United Kingdom
³Centre de Recherches Nucléaires, F-67037 Strasbourg CEDEX, France
⁴SERC Daresbury Laboratory, Warrington, WA4 4AD, United Kingdom
⁵Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund, Sweden
⁶Joint Institute for Heavy Ion Research and Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
⁷Department of Physics, University of Tennessee, Knoxville, Tennessee 37996

^*Permanent address: Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland; Institute of Physics, Warsaw Institute of Technology, Warsaw, Poland.