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 »
- 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}
}