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Title: Single-neutron states in {sup 101}Sn.

Abstract

The first data on the relative single-particle energies outside the doubly magic {sup 100}Sn nucleus were obtained. A prompt 171.7(6) keV {gamma}-ray transition was correlated with protons emitted following the {beta} decay of {sup 101}Sn and is interpreted as the transition between the single-neutron g{sub 7/2} and d{sub 5/2} orbitals in {sup 101}Sn. This observation provides a stringent test of current nuclear structure models. The measured {nu}{sub g7/2}-{nu}{sub d5/2} energy splitting is compared with values calculated using mean-field nuclear potentials and is used to calculate low-energy excited states in light Sn isotopes in the framework of the shell model. The correlation technique used in this work offers possibilities for future, more extensive spectroscopy near {sup 100}Sn.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
915011
Report Number(s):
ANL/PHY/JA-59365
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0804875
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 99; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; EXCITED STATES; NUCLEAR POTENTIAL; NUCLEAR STRUCTURE; PROTONS; SHELL MODELS; SPECTROSCOPY; TIN

Citation Formats

Seweryniak, D., Carpenter, M. P., Gros, S., Hecht, A. A., Hoteling, N., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Lister, C. J., Lotay, G., Peterson, D., Robinson, A. P., Walters, W. B., Wang, X., Woods, P. J., Zhu, S., Physics, Univ. of Maryland, Univ. of Edinburgh, and Univ. of Notre Dame. Single-neutron states in {sup 101}Sn.. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.022504.
Seweryniak, D., Carpenter, M. P., Gros, S., Hecht, A. A., Hoteling, N., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Lister, C. J., Lotay, G., Peterson, D., Robinson, A. P., Walters, W. B., Wang, X., Woods, P. J., Zhu, S., Physics, Univ. of Maryland, Univ. of Edinburgh, & Univ. of Notre Dame. Single-neutron states in {sup 101}Sn.. United States. doi:10.1103/PhysRevLett.99.022504.
Seweryniak, D., Carpenter, M. P., Gros, S., Hecht, A. A., Hoteling, N., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Lister, C. J., Lotay, G., Peterson, D., Robinson, A. P., Walters, W. B., Wang, X., Woods, P. J., Zhu, S., Physics, Univ. of Maryland, Univ. of Edinburgh, and Univ. of Notre Dame. Mon . "Single-neutron states in {sup 101}Sn.". United States. doi:10.1103/PhysRevLett.99.022504.
@article{osti_915011,
title = {Single-neutron states in {sup 101}Sn.},
author = {Seweryniak, D. and Carpenter, M. P. and Gros, S. and Hecht, A. A. and Hoteling, N. and Janssens, R. V. F. and Khoo, T. L. and Lauritsen, T. and Lister, C. J. and Lotay, G. and Peterson, D. and Robinson, A. P. and Walters, W. B. and Wang, X. and Woods, P. J. and Zhu, S. and Physics and Univ. of Maryland and Univ. of Edinburgh and Univ. of Notre Dame},
abstractNote = {The first data on the relative single-particle energies outside the doubly magic {sup 100}Sn nucleus were obtained. A prompt 171.7(6) keV {gamma}-ray transition was correlated with protons emitted following the {beta} decay of {sup 101}Sn and is interpreted as the transition between the single-neutron g{sub 7/2} and d{sub 5/2} orbitals in {sup 101}Sn. This observation provides a stringent test of current nuclear structure models. The measured {nu}{sub g7/2}-{nu}{sub d5/2} energy splitting is compared with values calculated using mean-field nuclear potentials and is used to calculate low-energy excited states in light Sn isotopes in the framework of the shell model. The correlation technique used in this work offers possibilities for future, more extensive spectroscopy near {sup 100}Sn.},
doi = {10.1103/PhysRevLett.99.022504},
journal = {Phys. Rev. Lett.},
number = 2007,
volume = 99,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • In-beam {gamma}-ray studies of nuclei with a large proton excess are faced with ever decreasing cross sections and large backgrounds due to strong less exotic reaction channels. However, many of the nuclei along the proton drip line {alpha} decay, proton decay or emit {beta}-delayed particles. This offers a very selective tag for prompt {gamma} rays and has been known as the Recoil-Decay Tagging (RDT) method. RDT has been extensively used with the Gammasphere array of Compton suppressed Ge detectors coupled with the Argonne Fragment Mass Analyzer. Recently, despite a very small cross section of about 50 nb and a longmore » half life of {approx}2 s, protons emitted following the {beta} decay of {sup 101}Sn were used to identify {gamma}-ray transitions in {sup 101}Sn. As a result, the energy splitting between the neutron g{sub 7/2} and d{sub 5/2} orbitals outside the {sup 100}Sn core was deduced. The structure of light Sn isotopes is discussed in the framework of the shell model in light of the new results. Another state-of-the-art example is the observation of a rotational ground-state band in the fast proton emitter {sup 145}Tm, which decays with a half live of only {approx}3 {mu}s. In this experiment, coincidences between the proton decay to the 2{sup +} excited state in the daughter nucleus and the 2{sup +}{yields}0{sup +} {gamma}-ray transition were also measured, which constitutes the first direct proof of proton decay fine structure. Based on the data the possibility of a triaxial shape in {sup 145}Tm is considered.« less
  • The first data on the relative single-particle energies outside the doubly magic {sup 100}Sn nucleus were obtained. A prompt 171.7(6) keV {gamma}-ray transition was correlated with protons emitted following the {beta} decay of {sup 101}Sn and is interpreted as the transition between the single-neutron g{sub 7/2} and d{sub 5/2} orbitals in {sup 101}Sn. This observation provides a stringent test of current nuclear structure models. The measured {nu}g{sub 7/2}-{nu}d{sub 5/2} energy splitting is compared with values calculated using mean-field nuclear potentials and is used to calculate low-energy excited states in light Sn isotopes in the framework of the shell model. Themore » correlation technique used in this work offers possibilities for future, more extensive spectroscopy near {sup 100}Sn.« less
  • A search for {gamma}-ray transitions in {sup 101}Sn, which contains only one neutron outside the {sup 100}Sn core, was carried out at the Argonne Tandem-Linac Accelerator System. {sup 101}Sn nuclei were produced using the {sup 46}Ti({sup 58}Ni,3n){sup 101}Sn reaction. In-beam {gamma} rays were detected in the Gammasphere Ge-detector array and were correlated with {sup 101}Sn {beta}-delayed protons using the Recoil-Decay Tagging method. A {gamma}-ray line at 172 keV was assigned to {sup 101}Sn and was interpreted as the transition between the single-neutron g{sub 7/2} and d{sub 5/2} states. The measured {nu}g{sub 7/2}-{nu} d5/2 energy splitting is compared with predictions ofmore » various mean-field potentials. It is also used to calculate multi-neutron configurations in light Sn isotopes. Prospects of using {beta}-delayed protons for tagging other exotic nuclei in the {sup 100}Sn region are discussed.« less
  • A search for in-beam {gamma}-ray transitions in {sup 101}Sn, which contains only one neutron outside the {sup 100}Sn core, using a novel approach was carried out at the Argonne Tandem-Linac System. {sup 101}Sn nuclei were produced using the {sup 46}Ti({sup 58}Ni, 3n){sup 101}Sn fusion-evaporation reaction. Beta-delayed protons with energies and decay times consistent with previous {sup 101}Sn decay studies were observed at the focal plane of the Fragment Mass Analyzer. In-beam {gamma} rays were detected in the Gammasphere Ge-detector array and were correlated with the {sup 101}Sn {beta}-delayed protons using the Recoil-Decay Tagging method. As a result, a {gamma}-ray transitionmore » between the single-neutron {nu}g{sub 7/2} and {nu}d{sub 5/2} states situated at the Fermi surface was identified. The measured {nu}g{sub 7/2}-{nu}d{sub 5/2} energy splitting was compared with predictions corresponding to various mean-field potentials and was used to calculate multi-neutron configurations in light Sn isotopes. Similar approach can be used to study core excitations in {sup 101}Sn and other exotic nuclei near {sup 100}Sn.« less
  • The multipole mixing ratios of {delta}I=1 transitions between levels in rotational bands built on single-particle states in odd neutron nuclei are dependent on the configurations of the states. In particular, the mixing ratio can be used to distinguish between several possible single-particle configurations if interpreted with the particle-axial-rotor model. This work features the first determination of the ground-state configurations of {sup 109,111}Ru. The single-particle structures of the ground states of {sup 101}Zr and {sup 103,105,107}Mo as well as excited states in {sup 103,107}Mo are also investigated, with a new result found in {sup 107}Mo.