Rotational bands in 195, 197Tl

doi:10.1016/0375-9474(78)90030-1

Nuclear Physics A

Volume 299, Issue 2, 24 April 1978, Pages 255-284

https://doi.org/10.1016/0375-9474(78)90030-1 Get rights and content

Abstract

High-spin states in ^{195, 197}Tl have been populated with (α, xn) reactions and studied by means of in-beam γ-ray and e⁻ spectroscopic methods. Complementary studies of the decay of ^{195, 197}Pb to ^{195, 197}Tl have been carried out. Several new features have been observed in these nuclei. The $92^{−}$ bands of ^{195, 197}T1. extended to $272^{(−)}$ and $292^{(−)}$ , respectively, show a quenching of energy spacings between the $232^{−}$ , $252^{−}$ , $272^{(−}$ and $292^{(−}$ states. This has been interpreted as resulting from the coupling of a $h_{92}$ proton to the ( $π h^{−2}_{112})_{8+, 10+}$ configurations in the core nuclei ^{194, 196}Hg. Furthermore, positive-parity bands based on $152^{+}$ states were established up to the $352^{(+)}$ and $292^{(+)}$ states in ^{195, 197}Tl respectively. Probably these bands originate from the coupling of a h $_{92}$ proton to a broken neutron pair. This pair consists of a rotation-aligned $i_{132}$ neutron and a low-j neutron in the $P_{12}$ , $P_{32}$ or $f_{52}$ shell. It is known to constitute the 5⁻ bands in ^{194, 196}Hg.

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Observation of multiple doubly degenerate bands in 195Tl
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The High-spin states in ¹⁹⁵Tl, populated through the ^185,187Re(¹³C, xn) fusion evaporation reaction at the beam energy of 75 MeV, were studied using the Indian National Gamma Array (INGA). More than 50 new γ transitions have been placed in the proposed level scheme which is extended up to the excitation energy of ≈ 5.6 MeV and spin $= 22.5 ħ$ . Two pairs of degenerate bands based on two different quasi-particle configurations have been identified in this nucleus indicating the first observation of such bands in an odd-A nucleus in $A \sim 190$ region and signify the first evidence of multiple chiral bands in a nucleus in this region. The total Routhian surface calculations predict triaxial shapes for both the configurations and thereby, support the experimental observation. The importance of multiple neutron holes in the $i_{13 / 2}$ orbital and the stability of shapes for these two configurations have been discussed.
Nuclear Data Sheets for A = 195
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Experimental structure and decay data for all nuclides with mass number A=195 (Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn) have been revised, updated, and incorporated into the ENSDF data file. All literature available by March 2014 has been considered. This evaluation supersedes the previous one for this mass chain (Zhou Chunmei, Nuclear Data Sheets 86, 645 (1999), 1999Zh11). The detailed level schemes, decay schemes, experimental reaction and decay data on which they are based are summarized and presented here. References, Jπ arguments, and comments are given in the text. No excited state data are yet available for ¹⁹⁵Re and ¹⁹⁵Rn. The adopted levels for ¹⁹⁵At are firstly presented in this evaluation. In addition, Q values have been updated based on 2012Wa38.
Nuclear Data Sheets for A = 197
2005, Nuclear Data Sheets
The 1995 Nuclear Data Sheets for A = 197 (1995Zh27) have been updated on the basis of the experimental results from various decay and reaction studies leading to nuclides in the A = 197 mass chain since January 1995 (cutoff date of the last evaluation). The updated level schemes and decay schemes, and experimental decay and reaction data on which they are based, are summarized and presented for all nuclides with mass number A = 197. The adopted values of level energies, level spins and parities are given, and γ-ray energies, γ-ray intensities, as well as other nuclear properties are presented. The references, Jπ arguments, and necessary comments are given in the text.
Nuclear data sheets for A = 195
1999, Nuclear Data Sheets
The 1994 version of Nuclear Data Sheets for A = 195 (94Zh15) has been updated on the basis of the experimental results from reactions and decays leading to nuclides of mass number A = 195 by the cutoff date noted below. The detailed level schemes and decay schemes, and experimental reaction and decay data on which they are based are summarized and presented for all nuclides with mass number A = 195. The experimental data are evaluated; the inconsistencies and discrepancies are noted; and adopted values for levels and γ-ray energies, γ-ray intensities, as well as for other nuclear properties, are presented. The references, Jπ arguments, and necessary comments are given in the text.
Nuclear data sheets update for A = 197
1995, Nuclear Data Sheets
The 1991 Nuclear Data Sheets for A=197 (91Zh0l) have been updated on the basis of the experimental results from various decay and reaction studies leading to nuclides in the A=197 mass chain since December 1989 (cutoff date of the last evaluation). The updated level schemes and decay schemes, and experimental decay and reaction data on which they are booed, are summarized and presented for all nuclides with mass number A=197. The adopted values of level energies, level spins and parities are given, and γ-ray energies, γ-ray intensities, as well as other nuclear properties are presented. The references, Jπ arguments, and necessary comments are given in the text.
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1994, Nuclear Physics, Section A
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^†: Present address: State University of New York, Stony Brook, New York 11974, USA.

^††: Present address: Institut fü Kernphysik, Technische Hochschule Darmstadt, 61 Darmstadt, W. Germany.

^†††: Also Department of Physics, University of Bonn, D-53 Bonn, W. Germany.

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Nuclear Physics A

Abstract

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