[en] The yrast sequence in ¹⁸³Tl has been studied for the first time in recoil-mass and decay tagged gamma-ray spectroscopic measurements. A rotational-like cascade of seven transitions is observed down to the bandhead with spin 13/2+. In contrast to adjacent nuclei, links from the yrast band to a lower lying weakly deformed (oblate) structure are not observed. It appears that the prolate energy minimum in ¹⁸³Tl drops significantly compared to ¹⁸⁵Tl and minimizes below the neutron i13/2 midshell (n <= 102). Possibilities for the decay out of the band in ¹⁸³Tl are discussed

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[en] The yrast sequence in ¹⁸³Tl has been studied for the first time in recoil-mass and decay tagged γ-ray spectroscopic measurements. A rotational-like cascade of seven transitions is observed down to the bandhead with spin 13/2⁺. In contrast to adjacent nuclei, links from the yrast band to a lower lying weakly deformed (oblate) structure are not observed. It appears that the prolate energy minimum in ¹⁸³Tl drops significantly compared to ¹⁸⁵Tl and minimizes below the neutron i_13/2 midshell (N≤102). Possibilities for the decay out of the band in ¹⁸³Tl are discussed

[en] This work is concerned with the study of exotic nuclei located on both sides of the stability-line and known as neutron rich and neutron deficient respectively. For the former, produced by alpha particle-induced fission, an on-line isotope separation with an ion guide (IGISOL) has been developed and submitted to several off-line and on-line optimization tests showing capacity to spectroscopic studies. In the case of neutron deficient nuclei near the magicity Z=82, ¹⁸²Tl(3s) has been identified and its decaying modes and those of ¹⁸³Tl ground state, studied, using the on-line separator ISOLDE. On the other hand, the β decay of ^172,175Ir produced in ³²S induced reaction is studied using a helium jet system on the SARA accelerator. Existence of isomers is derived from half-lives measurements

[en] High-spin states in the nucleus ¹⁸³Tl have been studied using the recoil decay tagging and recoil tagging techniques. The data have enabled new structures to be identified which are believed to be based on prolate f_7/2, h_9/2, and oblate h_9/2 configurations. In addition, the prolate i_3/2 structure has also been extended. The systematics of the newly identified structures will be discussed. The α decay of ¹⁸³Tl has also been investigated. Examination of both delayed and prompt γ rays in coincidence with the prominent 6333-keV α decay, together with an investigation of the effects of the summing of L electrons, allow assignment of transitions and the construction of tentative low-spin decay schemes for ¹⁷⁹Au and ¹⁷⁵Ir

[en] 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 ¹⁸⁷Bi ground state (h_9/2) to ¹⁸³TI ground state s_1/2 α transition. Its energy when combined with those of two earlier known transitions, namely ¹⁸⁷Bi (h_9/2) → ^183mTl (h_9/2) and ^187mBi (s_1/2) → ¹⁸³Tl(s_1/2), establishes the excitation energies of the ^183mTl and ^187mBi to be 620(20) keV and 110(20) keV, respectively. This value for ^187mBi is 80 keV lower than the excitation energy of the same intruder level in ¹⁸⁹Bi. Implications of this result with respect to intruder-state systematics are discussed

[en] The excitation energies of the single-particle normal and intruder levels in both ¹⁸³Tl and ¹⁸⁷Bi were measured for the first time via the α decay of ¹⁸⁷Bi produced in the ⁹⁷Mo(⁹²Mo,pn)¹⁸⁷Bi reaction. The previously unobserved ¹⁸⁷Bi ground state (h_9/2) to ¹⁸³Tl ground state (s_1/2) α 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. (orig.)

[en] The yrast sequence in ¹⁸³Tl has been studied for the first time in recoil-mass selected γ-ray spectroscopic measurements. A rotational-like cascade of seven transitions is established down to the band head with probable spin and parity (13/2⁺). Unlike in the adjacent odd-mass Tl nuclei, prompt γ decay from the yrast band to a lower lying weakly deformed (oblate) structure is not observed. These features are consistent with the predicted drop of the prolate band head in ¹⁸³Tl compared to ¹⁸⁵Tl. The implications for the prolate energy minimum in odd-mass Tl nuclei at the neutron i_13/2 midshell (N=103) are discussed. (c) 2000 The American Physical Society

[en] Evaluated nuclear structure and decay data for all nuclides with mass number A=183 (Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb) are presented here. At, Po and Fr have not yet been observed, but for prediction of ground state and/or isomer properties see, e.g., 2015Bh08 (At, Fr), 2013Ba41 (Tl), 2013Ho05 (Po). This evaluation includes structure and decay data information available by 15 April 2015 and supersedes that by R.B. Firestone published in Nuclear Data Sheets65, 589 (1992) (literature cutoff 9 January 1991), and subsequent revisions by C.M. Baglin for "1"8"3Au in ENSDF database (literature cutoff 13 March 1999), "1"8"3Hg in Nuclear Data Sheets91, 117 (2000) (literature cutoff 25 September 2000), "1"8"3Tl in Nuclear Data Sheets95, 49 (2002) (literature cutoff 1 January 2002) and "1"8"3Pb in ENSDF (literature cutoff 6 January 2003). Since the prior Nuclear Data Sheets publication of this mass chain: "1"8"3Yb (2012Ku26) and "1"8"3Pb (2006An11, 2006Se18, 2007De09, 2009Se13) have been observed; our knowledge of high–spin states has been significantly expanded for "1"8"3Ta (2009Sh17), "1"8"3W (1999Sa60), "1"8"3Re (1998Ha51, 2001Sh41), "1"8"3Au (2002Jo18, 2005So01) and "1"8"3Tl (2001Mu26, 2004Ra28); a large amount of new structure information for "1"8"3W has been obtained from transfer reactions (1997Pr02, 2011Bo09), (n,n'γ) (1993Pr09) and thermal neutron capture (1993Pr09, 1997Pr02, 2011Bo09, 2014Hu02), as well as from the two–photon cascade study by 2005Su29.

[en] The yrast sequence in ¹⁸³Tl has been studied for the first time in recoil-mass and decay tagged γ-ray spectroscopic measurements. A rotational-like cascade of seven transitions is observed down to the bandhead with spin 13/2⁺. In contrast to adjacent nuclei, links from the yrast band to a lower lying weakly deformed (oblate) structure are not observed. It appears that the prolate energy minimum in ¹⁸³Tl drops significantly compared to ¹⁸⁵Tl and minimizes below the neutron i_13/2 midshell (N≤102). Possibilities for the decay out of the band in ¹⁸³Tl are discussed. (c) 1999 American Institute of Physics