Multiphonon vibrations in deformed nuclei

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243841

Aprahamian, A ^[1]

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1. Univ. of Notre Dame, South Bend, IN (United States)

Vibrational degrees of freedom in both spherical and deformed nuclei are represented by phonon excitations resulting from the oscillations of liquid drop. In spherical nuclei, harmonic vibrational motion yields an excitation spectrum that consists of equally spaced phonon multiplets. Although harmonic vibrational motion has never been observed in spherical nuclei, there are numerous examples of anharmonic vibrational motion. In fact, one and two phonon vibrational states have been observed in tens of nuclei, as well as, a single isolated case of three phonon excitations. In deformed nuclei, there are two types of vibrations built on a rotational ground state where the single phonon vibrations of K=0 and K=2 are labelled as {open_quotes}{beta}{close_quotes} and {open_quotes}{gamma}{close_quotes} excitations. There are many examples of single phonon vibrations in deformed nuclei. However, the existence of collective two-phonon excitations in deformed nuclei had been an open question in nuclear structure physics for over thirty years with serious implications to the understanding of collectivity in nuclei. The discussion will focus on the evidence for double-phonon bands in the entire deformed rare-earth region, as well as, a new signature of double-phonon vibrational bands in terms of their dynamical moments of inertia.

• OSTI ID: 243841
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COLLECTIVE EXCITATIONS
DEFORMED NUCLEI
LIQUID DROP MODEL
PHONONS