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Title: Structure and collectivity very far from stability: Coulomb excitation of radioactive nuclear beams in inverse kinematics

Abstract

Short communication.

Authors:
 [1]; ;  [2];  [3];  [4]
  1. Clark Univ., Worcester, MA (United States)
  2. Brookhaven National Lab., Upton, NY (United States)
  3. Clark Univ., Worcester, MA (United States)|[Brookhaven National Lab., Upton, NY (United States)
  4. Clark Univ., Worcester, MA (United States)|[Brookhaven National Lab., Upton, NY (United States)|[Institutul de Fizica Atomica, Bucharest (Romania)
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
88543
Report Number(s):
BNL-61912; CONF-950660-1
ON: DE95014642; TRN: 95:017740
DOE Contract Number:
AC02-76CH00016
Resource Type:
Technical Report
Resource Relation:
Conference: ENAM `95: international conference on exotic nuclei and atomic masses, Arles (France), 19-23 Jun 1995; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; RADIOACTIVE ION BEAMS; COULOMB EXCITATION; NUCLEAR STRUCTURE; COLLECTIVE MODEL; OSMIUM 188

Citation Formats

Brenner, D.S., Gill, R.L., Casten, R.F., Barton, C.J., and Zamfir, N.V. Structure and collectivity very far from stability: Coulomb excitation of radioactive nuclear beams in inverse kinematics. United States: N. p., 1995. Web. doi:10.2172/88543.
Brenner, D.S., Gill, R.L., Casten, R.F., Barton, C.J., & Zamfir, N.V. Structure and collectivity very far from stability: Coulomb excitation of radioactive nuclear beams in inverse kinematics. United States. doi:10.2172/88543.
Brenner, D.S., Gill, R.L., Casten, R.F., Barton, C.J., and Zamfir, N.V. Sat . "Structure and collectivity very far from stability: Coulomb excitation of radioactive nuclear beams in inverse kinematics". United States. doi:10.2172/88543. https://www.osti.gov/servlets/purl/88543.
@article{osti_88543,
title = {Structure and collectivity very far from stability: Coulomb excitation of radioactive nuclear beams in inverse kinematics},
author = {Brenner, D.S. and Gill, R.L. and Casten, R.F. and Barton, C.J. and Zamfir, N.V.},
abstractNote = {Short communication.},
doi = {10.2172/88543},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1995},
month = {Sat Jul 01 00:00:00 EDT 1995}
}

Technical Report:

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  • Techniques for the measurement of B (E2:0{sub 1}{sup +} {r_arrow} 2{sub 1}{sup +}) values by Coulomb excitation of Radioactive Nuclear Beams in inverse kinematics are described. Using a thin, low Z target, the Coulomb excited beam nuclei will decay in flight downstream of the target. For long lifetimes (nanosecond range) these nuclei decay centimeters downstream of the target and for shorter lifetimes (picoseconds or less) they decay near the target. Corresponding to these two lifetime regimes two methods have been developed to measure {gamma} rays from the Coulomb excited nuclei: the lifetime method in which the lifetime of the excitedmore » state is deduced from the decay curve and the integral method in which the B(E2) value is extracted from the measured total Coulomb excitation cross section.« less
  • Coulomb excitation is a powerful, well-understood, and selective technique to excite levels in nuclei primarily through E2 transitions with relatively large cross sections (typically 10s of mbarns). A description of an apparatus to measure total Coulomb excitation cross sections of radioactive nuclear beams will be presented. The apparatus uses inverse kinematics in order to overcome the difficulties presented by limited beam intensities and high background rates. A high efficiency NaI(Tl) through-well detector is used to observe the deexcitation {gamma}-rays. The discussion will address the challenges of doing low energy Coulomb excitation experiments of radioactive beam nuclei and a recent experimentmore » with radioactive {sup 69}As nuclei at the Holifield Radioactive Ion Beam Facility (HRIBF). {copyright} {ital 1998 American Institute of Physics.}« less
  • Coulomb excitation is a powerful, well-understood, and selective technique to excite levels in nuclei primarily through E2 transitions with relatively large cross sections (typically 10s of mbarns). A description of an apparatus to measure total Coulomb excitation cross sections of radioactive nuclear beams will be presented. The apparatus uses inverse kinematics in order to overcome the difficulties presented by limited beam intensities and high background rates. A high efficiency NaI(Tl) through-well detector is used to observe the deexcitation {gamma}-rays. The discussion will address the challenges of doing low energy Coulomb excitation experiments of radioactive beam nuclei and a recent experimentmore » with radioactive {sup 69}As nuclei at the Holifield Radioactive Ion Beam Facility (HRIBF)« less
  • The advent of Radioactive Nuclear Beam facilities will soon open new perspectives for nuclear structure studies. However, they will never provide the same wealth of data as stable beam facilities. Recent studies have shown that B(E2;0{sub 1}{sup +}2{sub 1}{sup +}) values have a high degree of sensitivity to structural features. We developed several techniques to obtain these values by low-energy Coulomb excitation of Radioactive Nuclear Beams in inverse kinematics on low Z targets. The methods are based on the measurement of the decay curve as the Coulomb excited nuclei decay in-flight. The apparatus will be described and recent results ofmore » test runs with stable beams will be presented.« less
  • The fragmentation of high-energy heavy-ion projectiles routinely produces nuclei at the limits of stability. The recent combination of versatile heavy-ion accelerators (primarily cyclotrons) with large acceptance fragment separators has made these exotic isotopes available for nuclear structure studies. The four presently operating projectile-fragmentation facilities devote significant fractions of their experimental programs to studies of nuclei divided into three rough categories: demonstration of existence, measured at the limits to stability that can be divided in to three rough categories: demonstration of existance, measurement of the decay properties, and use in secondary reactions. Recent work using unusual isotopic beams has demonstrated themore » production of nuclei along the proton drip-line up to A{approx}80 and up to A{approx}30 in the substantially harder to attain neutron drip line. The measurement of the decay properties of such exotic nuclei have been readily carried out by transporting, them with normal beam lines to low background vaults for traditional measurements of beta-decay half-lives, delayed particle emission`, etc. of the stopped beams. Perhaps the most exciting and new feature of these radioactive beams is that even the most exotic unstable nuclei can be used in secondary nuclear reactions. Intense effort has been put into studies of light neutron-rich nuclei, ranging from elastic scattering, to direct reactions and even secondary {open_quote}projectile-fragmentation{close_quotes} but many other possibilities are beginning to be explored.« less