Compressional-mode giant resonances in deformed nuclei

Masatoshi Itoh ,K Hara ,Hiroyuki Takeda ,S Zhu ,T Murakami ,U Garg ,T Ishikawa ,S Terashima ,Toshihiko Taki ,M̄ Fujiwara ,M Yosoi ,Yusuke Yasuda ,B K Nayak ,H Sakaguchi ,Michael Koss ,H Akimune ,H P Yoshida ,H Fujimura ,N Tsukahara ,M Uchida ,T Kawabata ,Mohsen Harakeh ,M Hedden ,B Kharraja ,M Volkerts

doi:10.1016/s0370-2693(02)02892-7

Abstract

Background-free inelastic scattering spectra have been obtained for the Sm isotopes with 400 MeV α particles at forward angles (including 0°) to investigate the effect of deformation on the compressional-mode giant resonances. The strength distributions for the isoscalar giant resonances (L⩽3) have been extracted for the spherical nucleus 144Sm and the deformed nucleus 154Sm. We have observed that the effects of deformation are different for the low- and high-excitation-energy components of the isoscalar giant dipole resonance in 154Sm. Evidence for the theoretically predicted coupling between the isoscalar dipole resonance and the high-energy octupole resonance is reported.

Highlights

Background-free inelastic scattering spectra have been obtained for the Sm isotopes with 400 MeV α particles at forward angles to investigate the effect of deformation on the compressional-mode giant resonances
The giant monopole resonance (GMR) and the isoscalar giant dipole resonance (ISGDR) are of considerable interest since their excitation energies directly relate to the incompressibility of nuclear matter, an important component of the nuclear equation of state which plays a crucial role in describing nucleon motion in nuclei, and is related to the type II supernova explosions
It was reported about two decades ago that the giant resonance “bump” in the deformed nucleus had a larger “lower” component when compared with that in the spherical nuclei. This was interpreted as implying that the GMR splits into two components because of coupling with the K = 0 component of the giant quadrupole resonance (GQR) [1,2]

Summary

University of Groningen

Compressional-mode giant resonances in deformed nuclei Itoh, M; Sakaguchi, H; Uchida, M; Ishikawa, T; Kawabata, T; Murakami, T; Takeda, H; Taki, T; Terashima, S; Tsukahara, N. Document Version Publisher's PDF, known as Version of record. Citation for published version (APA): Itoh, M., Sakaguchi, H., Uchida, M., Ishikawa, T., Kawabata, T., Murakami, T., Takeda, H., Taki, T., Terashima, S., Tsukahara, N., Yasuda, Y., Yosoi, M., Garg, U., Hedden, M., Kharraja, B., Koss, M., Nayak, BK., Zhu, S., Fujimura, H.,. More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverneamendment. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Received 16 July 2002; received in revised form 4 September 2002; accepted 18 October 2002

Ex is the excitation energy and

Findings

GMR GQR