skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Extreme {gamma}-ray spectroscopy : single-neutron states in {sup 101}Sn and rotation of the proton emitter {sup 145}Tm.

Abstract

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 long 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 {micro}s. In this experiment, coincidences between themore » 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

Authors:
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
971159
Report Number(s):
ANL/PHY/CP-60190
TRN: US1001044
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: International Conference on Proton Emitting Nuclei and Related Topics (PROCON07); Jun. 17, 2007 - Jun. 23, 2007; Lisbon, Portugal
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CROSS SECTIONS; DECAY; EXCITED STATES; FINE STRUCTURE; HALF-LIFE; NEUTRONS; NUCLEI; PROTONS; ROTATION; SHAPE; SHELL MODELS; SPECTROSCOPY

Citation Formats

Seweryniak, D, and Physics. Extreme {gamma}-ray spectroscopy : single-neutron states in {sup 101}Sn and rotation of the proton emitter {sup 145}Tm.. United States: N. p., 2007. Web. doi:10.1063/1.2827248.
Seweryniak, D, & Physics. Extreme {gamma}-ray spectroscopy : single-neutron states in {sup 101}Sn and rotation of the proton emitter {sup 145}Tm.. United States. https://doi.org/10.1063/1.2827248
Seweryniak, D, and Physics. 2007. "Extreme {gamma}-ray spectroscopy : single-neutron states in {sup 101}Sn and rotation of the proton emitter {sup 145}Tm.". United States. https://doi.org/10.1063/1.2827248.
@article{osti_971159,
title = {Extreme {gamma}-ray spectroscopy : single-neutron states in {sup 101}Sn and rotation of the proton emitter {sup 145}Tm.},
author = {Seweryniak, D and Physics},
abstractNote = {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 long 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 {micro}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.},
doi = {10.1063/1.2827248},
url = {https://www.osti.gov/biblio/971159}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: