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Cited by 9 publications
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Ernest 0. Radiation lawrence Laboratory TWO-WEEK LOAN COPYThis is a Librar~ Circulating Cop~ which rna~ be borrowed for two wee~s. ISOMERIC LEVELS IN THE LIGHT THALLIUM ISOTOPES Berkeley, California DISCLAIMERThis document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or the Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or the Regents of the University of California. . e 1somer 1n is apparen ly a + eve , 1n c ose analogy with other known even-mass thallium isotopes. Considerable evidence was accumulated that in the odd-mass thallium nuclei, including the previously studied Tll97 and Tll95, the metastable state has spin and parity 9/2-. Such a state is not expected to occur at low energ~es in these nuclei, and its nature, therefore, presents an interesting problem. Tl + xn * This work was supported by the U. S. Atomic Energy Commission. Research and DevelopmentUNIVERSITY-2-. UCRL-10603After evaporation of the x neutrons, the residual thallium nucleus loses the last few MeV of its excitation by emission of gamma-rays; ··J:r a metastable state of millisecond to minutes half-life occurs in this cascade, those transitions following the decay of the isomeric level will be kept alive into the time interval between beam bursts, and can be observed without interference from all the more numerous prompt transitions occurring in the nuclear reaction. Of cocrse, if the ground state itself is radioactive, the transitions in the decay of the thallium to the mercury daughter will also appear in the gamma-ray spectrum, but with the different half-life characteristic of the ground-state decay.Because of the known existence of metastable states of the appropriate millisecond to seconds half-lives in some light thallium nuclei, 1 ' 2 '3 it was felt that a study of these nuclei would provide a good test of the experimental techniques. Because the levels in some of these nuclei have already been studied in the decay of the corresponding lead isotopes, many of the transitions observed in this work were previously known. The greater simplicity of the present method over the study of the decay of a mixture of lead isotopes has yielded some surprising...
Ernest 0. Radiation lawrence Laboratory TWO-WEEK LOAN COPYThis is a Librar~ Circulating Cop~ which rna~ be borrowed for two wee~s. ISOMERIC LEVELS IN THE LIGHT THALLIUM ISOTOPES Berkeley, California DISCLAIMERThis document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or the Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or the Regents of the University of California. . e 1somer 1n is apparen ly a + eve , 1n c ose analogy with other known even-mass thallium isotopes. Considerable evidence was accumulated that in the odd-mass thallium nuclei, including the previously studied Tll97 and Tll95, the metastable state has spin and parity 9/2-. Such a state is not expected to occur at low energ~es in these nuclei, and its nature, therefore, presents an interesting problem. Tl + xn * This work was supported by the U. S. Atomic Energy Commission. Research and DevelopmentUNIVERSITY-2-. UCRL-10603After evaporation of the x neutrons, the residual thallium nucleus loses the last few MeV of its excitation by emission of gamma-rays; ··J:r a metastable state of millisecond to minutes half-life occurs in this cascade, those transitions following the decay of the isomeric level will be kept alive into the time interval between beam bursts, and can be observed without interference from all the more numerous prompt transitions occurring in the nuclear reaction. Of cocrse, if the ground state itself is radioactive, the transitions in the decay of the thallium to the mercury daughter will also appear in the gamma-ray spectrum, but with the different half-life characteristic of the ground-state decay.Because of the known existence of metastable states of the appropriate millisecond to seconds half-lives in some light thallium nuclei, 1 ' 2 '3 it was felt that a study of these nuclei would provide a good test of the experimental techniques. Because the levels in some of these nuclei have already been studied in the decay of the corresponding lead isotopes, many of the transitions observed in this work were previously known. The greater simplicity of the present method over the study of the decay of a mixture of lead isotopes has yielded some surprising...
An intermediate coupling calculation has been carried out for nuclei of mass 18 and 19, taking full account of the configurational mixing of the 2 s and 1 d shells. The spin-orbit splitting of the d -level and the relative position of the s -level are taken from the observed 17 O spectrum, while the strength of the two-body central force is treated as a free parameter. No excitation of the 16 O closed shell core is considered. Excellent agreement is found for the positions of the even-parity energy levels and their properties, including the reaction data. The configurational mixing is very large, the strength of central force is similar to that required for the deuteron, and the mode of coupling is similar to that in the lithium nuclei.
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