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Title: REMARKS ON EXCITED STATES OF EVEN-EVEN NUCLEI AND ON THE EXISTENCE OF A COMPLEX VIBRATIONAL SECOND EXCITED STATE

Abstract

Different types of spectra in even-even nuclei are discussed. Properties of those nuclei for 40 < A < 154 and 180 < A < 222 are summarized. Several theoretical predictions of the existence of a complex vibrational second excited state are described and compared with experimental data. (auth)

Authors:
Publication Date:
Research Org.:
California. Univ., Berkeley. Lawrence Radiaiton Lab.
OSTI Identifier:
4192463
Report Number(s):
UCRL-9074
NSA Number:
NSA-14-013215
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-60
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; ATOMS; ENERGY LEVELS; MASS; NUCLEAR MODELS; NUCLEAR STRUCTURE; NUCLEAR THEORY; NUCLEI; SPECTRA; TABLES; VIBRATIONS

Citation Formats

Bosch, H.E. REMARKS ON EXCITED STATES OF EVEN-EVEN NUCLEI AND ON THE EXISTENCE OF A COMPLEX VIBRATIONAL SECOND EXCITED STATE. United States: N. p., 1960. Web. doi:10.2172/4192463.
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Bosch, H.E. REMARKS ON EXCITED STATES OF EVEN-EVEN NUCLEI AND ON THE EXISTENCE OF A COMPLEX VIBRATIONAL SECOND EXCITED STATE. United States. doi:10.2172/4192463.
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Bosch, H.E. Mon . "REMARKS ON EXCITED STATES OF EVEN-EVEN NUCLEI AND ON THE EXISTENCE OF A COMPLEX VIBRATIONAL SECOND EXCITED STATE". United States. doi:10.2172/4192463. https://www.osti.gov/servlets/purl/4192463.
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@article{osti_4192463,
title = {REMARKS ON EXCITED STATES OF EVEN-EVEN NUCLEI AND ON THE EXISTENCE OF A COMPLEX VIBRATIONAL SECOND EXCITED STATE},
author = {Bosch, H.E.},
abstractNote = {Different types of spectra in even-even nuclei are discussed. Properties of those nuclei for 40 < A < 154 and 180 < A < 222 are summarized. Several theoretical predictions of the existence of a complex vibrational second excited state are described and compared with experimental data. (auth)},
doi = {10.2172/4192463},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 1960},
month = {Mon Feb 01 00:00:00 EST 1960}
}
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Technical Report:
View Technical Report (0.54 MB)
DOI:  10.2172/4192463
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  • A series of experiments was performed in which gamma-ray spectra were measured, using a Ge(Li) detector, for incident 7 to 26-MeV protons on the even-even vibrational nuclei /sup 56/Fe, /sup 62/Ni, /sup 64/Zn, /sup 108/Pd, /sup 110/Cd, /sup 114/Cd, /sup 116/Cd, /sup 116/Sn, /sup 120/Sn, and /sup 206/Pb, and for incident 14-MeV neutrons on natural Fe, Ni, Zn, Cd, Sn, and Pb. These measurements yielded gamma-ray cross sections from which it was inferred that almost all of the gamma cascades from (p,p') and (n,n') reactions passed down through the first 2/sup +/ levels. Consequently, the strength of the 2/sup +/more » ..-->.. 0/sup +/ gamma transitions were found to be an indirect measure of the (p,p') or (n,n') cross sections. Several types of nuclear model calculations were performed and compared with experimental results. These calculations included coupled-channel calculations to reproduce the direct, collective excitation of the low-lying levels, and statistical plus pre-equilibrium model calculations to reproduce the (p,p') and the (n,n') cross sections for comparison with the 2/sup +/ ..-->.. 0/sup +/ gamma measurements. The agreement between calculation and experiment was generally good except at high energies, where pre-equilibrium processes dominate (i.e. around 26-MeV). Here discrepancies between calculations from the two different pre-equilibrium models and between the data and the calculations were found. Significant isospin mixing of T/sub greater than/ into T/sub less than/ states was necessary in order to have the calculations match the data for the (p,p') reactions, up to about 18-MeV.« less

  • The question of the validity of nuclear vibrations is discussed, and an attempt is made to understand the relationships between the collective states in spherical and deformed even-even nuclei. The approach is largely an empirical one employing (1) a collection and systemization of all experimental rotational and vibrational states in the regions of interest, (2) an attempt to calculate additional beta and alpha vibrations for deformed eveneven nuclei, and (3) a summary of the Coulomb excitation of vibrational states whose Coulomb excitation cross sections should be enhanced if these states are really collective in nature. (auth)