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Title: Average Nuclear Level Densities and Radiative Strength Functions in {sup 56,57}FE from Primary (Gamma)-Ray Spectra

Abstract

An experimental primary {gamma}-ray spectrum vs. excitation-energy bin (P(E{sub x}, E{sub {gamma}}) matrix) in a light-ion reaction is obtained for {sup 56,57}Fe isotopes using a subtraction method. By factorizing the P(E{sub x}, E{sub {gamma}}) matrix according to the Axel-Brink hypothesis the nuclear level density and the radiative strength function (RSF) in {sup 56,57}Fe are extracted simultaneously. A step structure is observed in the level density for both isotopes, and is interpreted as the breaking of Cooper pairs. The RSFs for {sup 56,57}Fe reveal an anomalous enhancement at low {gamma}-ray energies.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15002244
Report Number(s):
UCRL-JC-150505
TRN: US0400663
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 17th International Conference on the Application of Accelerators in Research and Industry CAARI 2002, Denton, TX (US), 11/12/2002--11/16/2002; Other Information: PBD: 26 Sep 2002
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATORS; COOPER PAIRS; ENERGY-LEVEL DENSITY; HYPOTHESIS; SPECTRA; STRENGTH FUNCTIONS

Citation Formats

Tavukcu, E, Becker, J A, Bernstein, L A, Garrett, P E, Guttormsen, M, Mitchell, G E, Rekstad, J, Schiller, A, Siem, S, Voinov, A, and Younes, W. Average Nuclear Level Densities and Radiative Strength Functions in {sup 56,57}FE from Primary (Gamma)-Ray Spectra. United States: N. p., 2002. Web.
Tavukcu, E, Becker, J A, Bernstein, L A, Garrett, P E, Guttormsen, M, Mitchell, G E, Rekstad, J, Schiller, A, Siem, S, Voinov, A, & Younes, W. Average Nuclear Level Densities and Radiative Strength Functions in {sup 56,57}FE from Primary (Gamma)-Ray Spectra. United States.
Tavukcu, E, Becker, J A, Bernstein, L A, Garrett, P E, Guttormsen, M, Mitchell, G E, Rekstad, J, Schiller, A, Siem, S, Voinov, A, and Younes, W. Thu . "Average Nuclear Level Densities and Radiative Strength Functions in {sup 56,57}FE from Primary (Gamma)-Ray Spectra". United States. https://www.osti.gov/servlets/purl/15002244.
@article{osti_15002244,
title = {Average Nuclear Level Densities and Radiative Strength Functions in {sup 56,57}FE from Primary (Gamma)-Ray Spectra},
author = {Tavukcu, E and Becker, J A and Bernstein, L A and Garrett, P E and Guttormsen, M and Mitchell, G E and Rekstad, J and Schiller, A and Siem, S and Voinov, A and Younes, W},
abstractNote = {An experimental primary {gamma}-ray spectrum vs. excitation-energy bin (P(E{sub x}, E{sub {gamma}}) matrix) in a light-ion reaction is obtained for {sup 56,57}Fe isotopes using a subtraction method. By factorizing the P(E{sub x}, E{sub {gamma}}) matrix according to the Axel-Brink hypothesis the nuclear level density and the radiative strength function (RSF) in {sup 56,57}Fe are extracted simultaneously. A step structure is observed in the level density for both isotopes, and is interpreted as the breaking of Cooper pairs. The RSFs for {sup 56,57}Fe reveal an anomalous enhancement at low {gamma}-ray energies.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 26 00:00:00 EDT 2002},
month = {Thu Sep 26 00:00:00 EDT 2002}
}

Conference:
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