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Title: Search for the two-octupole phonon vibrational state in {sup 208}Pb

Abstract

The first excited state of {sup 208}Pb has J{sup pi} = 3{sup {minus}} and is interpreted as a one-phonon vibration of octupole character, leading to the expectation of a multiplet of 2-phonon octupole states at roughly twice the 3{sup {minus}} energy. Recently, experiments to search for members of this multiplet were performed by bombarding {sup 208}Pb targets with {sup 208}Pb beams at GSI and {sup 64}Ni and {sup 82}Se beams at HMI. A {gamma} ray at 2485 keV was observed in each experiment, but was attributed to 2-phonon excitations by the GSI group, whereas the HMI group assigned this {gamma} ray to {sup 207}Pb. The authors have performed an experiment at Argonne using 1305 MeV beams of {sup 208}Pb to bombard thick targets of {sup 208}Pb, {sup 209}Bi, {sup 58,64}Ni, and {sup 160}Gd. They have identified some 30 known {gamma} rays from {sup 208}Pb, and after unfolding these spectra for Compton response, they observe broad structures in the energy region expected for the decay of 2-phonon states. Furthermore, they have confirmed the placement of the 2485 keV line in {sup 207}Pb.

Authors:
 [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
Publication Date:
OSTI Identifier:
199734
Report Number(s):
CONF-941129-
TRN: 95:005652-0229
Resource Type:
Conference
Resource Relation:
Conference: 13. international conference on the application of accelerators in research and industry, Denton, TX (United States), 7-10 Nov 1994; Other Information: PBD: 1994; Related Information: Is Part Of Thirteenth international conference on the application of accelerators in research and industry; Duggan, J.L.; Morgan, I.L. [eds.]; PB: 201 p.
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; LEAD 208 TARGET; LEAD 208 REACTIONS; BISMUTH 209 TARGET; NICKEL 58 TARGET; NICKEL 64 TARGET; GADOLINIUM 160 TARGET; LEAD 208; GAMMA SPECTRA; VIBRATIONAL STATES; GEV RANGE 01-10; MULTIPOLE RADIATION; PHONONS

Citation Formats

Moore, E F, and Triangle Univ. Nuclear Lab., Durham, NC. Search for the two-octupole phonon vibrational state in {sup 208}Pb. United States: N. p., 1994. Web.
Moore, E F, & Triangle Univ. Nuclear Lab., Durham, NC. Search for the two-octupole phonon vibrational state in {sup 208}Pb. United States.
Moore, E F, and Triangle Univ. Nuclear Lab., Durham, NC. Sat . "Search for the two-octupole phonon vibrational state in {sup 208}Pb". United States.
@article{osti_199734,
title = {Search for the two-octupole phonon vibrational state in {sup 208}Pb},
author = {Moore, E F and Triangle Univ. Nuclear Lab., Durham, NC},
abstractNote = {The first excited state of {sup 208}Pb has J{sup pi} = 3{sup {minus}} and is interpreted as a one-phonon vibration of octupole character, leading to the expectation of a multiplet of 2-phonon octupole states at roughly twice the 3{sup {minus}} energy. Recently, experiments to search for members of this multiplet were performed by bombarding {sup 208}Pb targets with {sup 208}Pb beams at GSI and {sup 64}Ni and {sup 82}Se beams at HMI. A {gamma} ray at 2485 keV was observed in each experiment, but was attributed to 2-phonon excitations by the GSI group, whereas the HMI group assigned this {gamma} ray to {sup 207}Pb. The authors have performed an experiment at Argonne using 1305 MeV beams of {sup 208}Pb to bombard thick targets of {sup 208}Pb, {sup 209}Bi, {sup 58,64}Ni, and {sup 160}Gd. They have identified some 30 known {gamma} rays from {sup 208}Pb, and after unfolding these spectra for Compton response, they observe broad structures in the energy region expected for the decay of 2-phonon states. Furthermore, they have confirmed the placement of the 2485 keV line in {sup 207}Pb.},
doi = {},
url = {https://www.osti.gov/biblio/199734}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}

Conference:
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