21 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Zganjar, E F"

open access

Structure of neutron deficient odd-proton nuclei near the shell closure at Z = 82

The experimental data on neutron-deficient, odd-proton isotopes of Au(Z = 79), Tl(Z = 81), and Bi(Z = 83) relevant to core particle coupling schemes and the shell model intruder state phenomenon are presented. The data show that, near the Z = 82 closed proton shell, the unpaired necleon can be used to probe the structure of the core. It is demonstrated that the description of this process in terms of core-particle coupling models enables on to quantify and systematize a large body of experiment… more

Date: January 1, 1979

Creator: Zganjar, E.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The structure of nuclei far from beta stability. Progress report, May 15, 1991--May 14, 1992

This report discusses: shape coexistence and intruder states; the electric monopole transition in nuclei; gold isotopes; platinum isotopes; iridium isotopes; search for superdeformation in {sup 192}Hg; search for population of superformed states in {sup 194}Pb using {sup 194}Bi {beta}{sup +}-decay; detailed nuclear structure studies far from stability; prototype internal pair spectrometer; and picosecond lifetime spectrometer.

Date: May 1, 1992

Creator: Zganjar, E. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The structure of nuclei far from beta stability

Date: January 1, 1992

Creator: Zganjar, E.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The structure of nuclei far from stability. Progress report, May 15, 1992--May 14, 1993

Studies on nuclei near Z=82 contributed to the establishment of a new region of nuclear deformation and a new class of nuclear structure at closed shells. A important aspect of this work is the establishment of the connection between low-lying 0{sup +} states in even{endash}even nuclei and the occurrence of shape coexistence in the odd-mass neighbors (E0 transitions in {sup 185}Pt, shape coexistence in {sup 184}Pt and {sup 187}Au). A new type of picosecond lifetime measurement system capable of… more

Date: May 1, 1993

Creator: Zganjar, E. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The structure of nuclei far from stability. [Dept. of Physics and Astronomy, Louisiana State Univ. , Baton Rouge, Louisiana]

Studies on nuclei near Z=82 contributed to the establishment of a new region of nuclear deformation and a new class of nuclear structure at closed shells. A important aspect of this work is the establishment of the connection between low-lying 0[sup +] states in even[endash]even nuclei and the occurrence of shape coexistence in the odd-mass neighbors (E0 transitions in [sup 185]Pt, shape coexistence in [sup 184]Pt and [sup 187]Au). A new type of picosecond lifetime measurement system capable of… more

Date: January 1, 1993

Creator: Zganjar, E.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Structure of Nuclei Far from Stability

From among a number of important nuclear structure results that have emerged from our research program during the past few years, two stand out as being of extra significance. These are: (a) the identification of a diabatic coexisting structure in {sup 187}Au which arises solely from differences in proton occupation of adjacent oscillator shells, and (b) the realization of a method for estimating EO strength in nuclei and the resulting prediction that the de-excitation of superdeformed bands ma… more

Date: February 25, 1999

Creator: Zganjar, E.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Low Energy E0 Transitions in Odd-mass Nuclei of the Neutron Deficient 180 < A < 200 Region

The region of neutron-deficient nuclei near Z = 82 and N = 104 provides the most extensive example of low-energy shape coexistence anywhere on the mass surface. It is shown that E0 and E0 admixed transitions may be used as a fingerprint to identify shape coexistence in odd-mass nuclei. It is also shown that all the known cases of low energy E0 and E0 admixed transitions in odd-mass nuclei occur where equally low-lying O/sup +/ states occur in neighboring even-even nuclei. A discussion of these … more

Date: January 1, 1987

Creator: Zganjar, E.F.; Kortelahti, M.O.; Wood, J.L. & Papanicolopulos, C.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Behavior of intruder based states in light Bi and Tl isotopes: the study of {sup 187 Bi} {alpha} decay

Intruder state excitation energies in odd-mass nuclei just outside a closed proton shell plotted versus neutron number generally exhibit parabola-shaped curves with minima near neutron mid-shells. The Bi isotopes, however, do not seem to follow this trend. Recent experiments performed at Argonne National Laboratory have identified the previously unobserved {sup 187}Bi ground state (h{sub 9/2}) to {sup 183}TI ground state s{sub 1/2} {alpha} transition. Its energy when combined with those of two … more

Date: January 1, 1997

Creator: Batchelder, J.C. & Zganjar, E.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electric monopole transitions: What they can tell us about nuclear structure

A brief survey of E0 strength in a number of nuclei in different regions of the nuclear chart is presented. The connection between E0 strength and shape coexistence is reviewed. Nuclear structure information obtained from measurements of electric monopole transitions in {sup 184}Pt and {sup 187}Au is discussed. Plans for future experiments utilizing radioactive ion beams and E0 internal-pair-formation is presented.

Date: December 31, 1995

Creator: Zganjar, E.F. & Wood, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electric monopole transitions: What they can tell us about nuclear structure

Date: July 2, 1997

Creator: Zganjar, E.F. & Wood, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study of {sup 189}Bi{sup m} {alpha} decay

In a series of {sup 48}Ti bombardments of {sup 144}Sm the decay energy of the {sup 189}Bi{sup m} ({pi}s{sub 1/2}) {alpha} transition that proceeds to the {pi}s{sub 1/2} ground state of {sup 185}Tl was measured to be 7.30(4) MeV. This result establishes the excitation energy of {sup 189}Bi{sup m} as 190(40) keV rather than the adopted 92(10)-keV value. Our data thus indicate a leveling off in excitation energy at N {approx} 106 for the s{sub 1/2} intruder state in odd-A Bi isotopes.

Date: December 1995

Creator: Batchelder, J. C.; Zganjar, E. F. & Toth, K. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigating proton emitters at the limits of stability with radioactive beams from the Oak Ridge facility

By using beams from the Holifield Radioactive Ion Beam Facility at ORNL, it should be possible to identify many new ground-state proton emitters in the mass region from Sn to Pb. In these investigations nuclei produced in fusion-evaporation reactions will be separated from incident ions and dispersed in mass/charge with a recoil mass separator and then implanted into a double-sided Si strip detector for study of proton (and {alpha}-particle) radioactivity. This paper summarizes data presently e… more

Date: October 1, 1996

Creator: Toth, K. S.; Batchelder, J. C.; Zganjar, E. F.; Bingham, C. R.; Wauters, J.; Davinson, T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Shape coexistence in /sup 185/Au

The ..beta..-decay of /sup 185/Hg ..-->.. /sup 185/Au has been studied following on-line mass separation at UNISOR/HHIRF. Transitions with strong EO components were observed feeding the h/sub 9/2/ and h/sub 11/2/ bands and are interpreted as resulting from the coupling of the h/sub 9/2/ and h/sub 11/2/ single-proton configurations in the /sup 184/Pt and /sup 186/Hg cores, respectively. 25 refs., 6 figs.

Date: January 1, 1985

Creator: Zganjar, E. F.; Papenicolopoulos, C. D.; Wood, J. L.; Braga, R. A.; Fink, R. W.; Larabee, A. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

UNISOR On-Line Nuclear Orientation Facility

The UNISOR on-line nuclear orientation facility consists of a He/sub 3/-He/sub 4/ dilution refrigerator on line to the isotope separator. Nuclei are implanted directly onto a target foil soldered to the bottom accessed cold finger of the refrigerator. A 1.5 T superconducting magnet polarizes the ferromagnetic target foils and determines the axis of symmetry. Up to eight gamma detectors can be positioned around the refrigerator, each 9 cm from the target. A unique feature of this system is that … more

Date: January 1, 1987

Creator: Girit, I. C.; Alton, G. D.; Bingham, C. R.; Carter, H. K.; Simpson, M. L.; Cole, J. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Energy Levels and Structure of Light Rare-earth Nuclei, /sup 136,138,140/Sm and /sup 132,134,136/Nd, via Beta Decay

Levels in /sup 136,138,140/Sm were populated by the beta decay of Eu, following (HI,pxn) reactions and on-line mass separation. Members of the ..gamma.. band were observed in all three daughter nuclei. Spectroscopic calculations were made using the triaxial rotor model, with all parameters derived microscopically from a Woods-Saxon deformed shell model. Comparison with the data supports the characterization of these nuclei in terms of a triaxial intrinsic shape. Improved decay schemes for /sup … more

Date: January 1, 1987

Creator: Kern, B. D.; Leander, G. A.; Mlekodaj, R. L.; Carter, H. K.; Kortelahti, M. O.; Zganjar, E. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lifetimes of the O{sub 2}{sup +} configuration in {sup 186}Hg and {sup 188}Hg

A new picosecond lifetime measurement system developed at UNISOR was used to determine the lifetime of the well-deformed 0{sub 2}{sup +} levels in {sup 188}Hg and {sup 186}Hg. The half-life values were measured to be 288 {plus_minus} 63 ps in {sup 188}Hg and {le} 52 ps in {sup 186}HG. The corresponding values of p{sup 2}(E0) {times} 10{sup 3} obtained from the E0 partial half-lives are 5.5{sub -2.3}{sup +1.5} and {ge} 32, respectively. Additionally, the half-lives of the 2{sub 2}{sup +} levels … more

Date: November 1, 1992

Creator: Joshi, P. K.; Zganjar, E. F.; Rupnik, D.; Robinson, S. J.; Mantica, P. F.; Carter, H. K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Behavior of Intruder Based States in Light Bi and Tl Isotopes: The Study of <sup>187</sup>Bi Alpha Decay

The excitation energies of the single-particle normal and intruder levels in both `83T1 and 187Bi were measured for the first time via the ct decay of 187Bi produced in the 97Mo(92Mo,pn) 187Bi reaction. The previously unobserved 187Bi ground state (kw) to 183T1 ground state (s1/2) a transition was identified establishing the 187Bi intruder state excitation energy to be 112(21) keV, 70 keV less than that of the same level in 189Bi.

Date: November 13, 1998

Creator: Batchelder, J. C.; Bingham, C. R.; Brown, L. T.; Conticchio, L. F.; Davids, C. N.; DeCoster, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Discovery of a new 2.3 s isomer in the neutron-rich nucleus 174Tm

No Description Available.

Date: January 5, 2005

Creator: Chakrawarthy, R. S.; Walker, P. M.; Smith, M. B.; Andreyev, A. N.; Ashley, S. F.; Ball, G. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proton Radioactivity Measurements at HRIBF: Ho, Lu, and Tm Isotopes

Two new isotopes, {sup 145}Tm and {sup 140}Ho and three isomers in previously known isotopes, {sup 141m}Ho, {sup 150m}Lu and {sup 151m}Lu have been discovered and studied via their decay by proton emission. These proton emitters were produced at the Holifield Radioactive Ion Beam Facility (HRIBF) by heavy-ion fusion-evaporation reactions, separated in A/Q with a recoil mass spectrometer (RMS), and detected in a double-sided silicon strip detector (DSSD). The decay energy and half-life was measu… more

Date: November 13, 1998

Creator: Akovali, Y.; Batchelder, J. C.; Bingham, C. R.; Davinson, T.; Ginter, T. N.; Gross, C. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proton Decay Studies of the Light Lu, Tm and Ho Isotopes

A double-sided Si-strip detector system has been installed and commissioned at the focal plane of the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility. The system can be used for heavy charged particle emission studies with half-lives as low as a few {micro}sec. In this paper the authors present identification and study of the decay properties of the five new proton emitters: {sup 140}Ho, {sup 141m}Ho, {sup 145}Tm, {sup 150m}Lu and {sup 151m}Lu.

Date: October 15, 1998

Creator: Akovali, Y.; Batchelder, J. C.; Bingham, C. R.; Davinson, T.; Ginter, T. N.; Gross, C. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The TRIUMF Nuclear Structure Program and TIGRESS

The Isotope Separator and Accelerator (ISAC) facility located at the TRIUMF laboratory in Vancouver, Canada, is one of the world's most advanced ISOL-type radioactive ion beam facilities. An extensive {gamma}-ray spectroscopy program at ISAC is centered around two major research facilities: (1) the 8{pi} {gamma}-ray spectrometer for {beta}-delayed {gamma}-ray spectroscopy experiments with the low-energy beams from ISAC-I, and (2) the next-generation TRIUMF-ISAC Gamma-Ray Escape Suppressed Spect… more

Date: August 30, 2006

Creator: Garrett, P. E.; Andreyev, A.; Austin, R. A. E.; Ball, G. C.; Bandyopadhyay, D.; Becker, J. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department