New levels and a lifetime measurement in {sup 204}Tl

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.024306· OSTI ID:21068111

Fotiades, N; Nelson, R O; Devlin, M; Becker, J A ^[1]

---

1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

The {sup 205}Tl(n,2n{gamma}) reaction was used to populate excited states in {sup 204}Tl. The {gamma}-ray detection was accomplished with the GEANIE spectrometer, a Compton suppressed array of 26 Ge detectors. An energetic beam of neutrons was provided by the pulsed neutron source of the Los Alamos Neutron Science Center's WNR facility. The time-of-flight technique was used to determine the incident neutron energies. {gamma}-ray excitation functions were determined from incident neutron energy of 1 MeV up to E{sub n}=25 MeV. The level scheme of {sup 204}Tl was enriched and the partial level scheme and nuclear structure above the previously known 7{sup +} isomer at 1104-keV excitation energy were established for the first time up to E{sub x}{approx}2.3 MeV. The high-spin part of the level scheme exhibits striking similarities to that of the neighboring {sup 202}Tl isotope, suggesting similarities in the underlying nuclear structure. The half-life of the 7{sup +} isomer was measured with a more precise result (T{sub 1/2}=60.7{+-}1.2 {mu}s), in agreement with literature values. A lower limit for the excitation energy of the {pi}h{sub 11/2}{nu}i{sub 13/2} structure with J{sup {pi}}=12{sup -} is proposed.

• OSTI ID: 21068111
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevC.77.024306; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EXCITATION
EXCITATION FUNCTIONS
EXCITED STATES
GAMMA DETECTION
GAMMA RADIATION
GE SEMICONDUCTOR DETECTORS
HALF-LIFE
ISOMERIC NUCLEI
KEV RANGE
LIFETIME
MEV RANGE
NEUTRON REACTIONS
NEUTRON SOURCES
NEUTRONS
NUCLEAR STRUCTURE
SPIN
THALLIUM 202
THALLIUM 204
THALLIUM 205
THALLIUM 205 TARGET