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Title: Multiphonon vibrations in deformed nuclei

Abstract

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.

Authors:
 [1]
  1. Univ. of Notre Dame, South Bend, IN (United States)
Publication Date:
OSTI Identifier:
243841
Report Number(s):
CONF-9304297-
Journal ID: BAPSA6; ISSN 0003-0503; TRN: 96:002199-0360
Resource Type:
Journal Article
Journal Name:
Bulletin of the American Physical Society
Additional Journal Information:
Journal Volume: 38; Journal Issue: 2; Conference: 1993 joint meeting of the American Physical Society and the American Association of Physics Teachers, Washington, DC (United States), 12-15 Apr 1993; Other Information: PBD: Apr 1993
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; DEFORMED NUCLEI; LIQUID DROP MODEL; COLLECTIVE EXCITATIONS; PHONONS

Citation Formats

Aprahamian, A. Multiphonon vibrations in deformed nuclei. United States: N. p., 1993. Web.
Aprahamian, A. Multiphonon vibrations in deformed nuclei. United States.
Aprahamian, A. Thu . "Multiphonon vibrations in deformed nuclei". United States.
@article{osti_243841,
title = {Multiphonon vibrations in deformed nuclei},
author = {Aprahamian, A},
abstractNote = {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.},
doi = {},
journal = {Bulletin of the American Physical Society},
number = 2,
volume = 38,
place = {United States},
year = {1993},
month = {4}
}