Nuclear systematics far from the line of beta stability: the low-lying excited states of^185,187,189Au

Nuclear structure of $$^{181}$$Au studied via $$\upbeta ^+$$/EC decay of $$^{181}$$Hg at ISOLDE

“…Transitions that are attributed to the α decay of 181 Hg are denoted with the α symbol. head is an isomeric state [24]. Such states were identified in all known odd-Au isotopes, with the exception of 179,181 Au [19,23,24,26].…”

“…head is an isomeric state [24]. Such states were identified in all known odd-Au isotopes, with the exception of 179,181 Au [19,23,24,26]. Figure 8 gives the projection of the γ-γ matrix with gates on a) 305.14, b) 607.76, and c) 760.18 keV transitions.…”

“…The nuclear structure of the odd-mass Au isotopes is distinguished by three major features: it is the longest chain of odd-mass isotopes for which excited state information is now available; there are proton-hole states that exhibit near constant energies over a change in neutron number corresponding to some 30 mass units; and there are multiple coexisting intruder states (involving proton-particle excitations across the Z = 82 closed shell). This picture has emerged from studies of highspin states using in-beam γ-ray spectroscopy [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and studies of low-spin and medium-spin states by β decay of Hg isotopes [19][20][21][22][23][24][25][26][27][28][29], atomic-beam magnetic resonance technique [30][31][32], in-source laser spectroscopy [33], α decay of Tl isotopes [34,35], and isomeric state decays in the Au isotopes [36,37]. Details of many of the intruder states have been given in reviews [38][39][40].…”

De-excitation of the strongly coupled band in Au177 and implications for core intruder configurations in the light Hg isotopes

“…The multipolarity of the 521-keV γ ray was determined using directional correlations from oriented states [22] and is consistent with a I = 1 transition [R DCO = 0.6(1)] leading to possible spin assignments of 9/2o r1 3 /2 for the initial state. The level energies associated with the 1h 11/2 ⊗ A+1 Hg configurations in odd-Au isotopes are established from the line of stability to beyond the proton drip line and vary smoothly as a function of neutron number [23][24][25]. These systematic trends favor the 13/2 − assignment for the 521-keV level.…”

Nuclear Moments and Deformation Change inA184ug,mBlanc1, Obert2, Oms3 et al. 1997Phys. Rev. Lett.460190View full textAdd to dashboardCite

“…In this context, the doubly odd nucleus 184 Au with its isomeric state at 68 keV excitation energy [11,12] is particularly interesting to investigate since it is located in the middle of this transitional region [13,14]: States corresponding to prolate and oblate or triaxial shapes coexist in 183,185 Au [9,15,16] and 185 Hg, while 183 Pt is prolate in all its low energy states [17][18][19]. Several nuclear spectroscopy studies were performed on 184 Au, and it has been established that (i) a shape coexistence is excluded at low excitation energy [20], and (ii) the spin and parity are 5 1 for the ground state and 2 1 for the isomer with the following proton-neutron ͑p ≠ n͒ configurations: ph 9 2 ≠ n 7 2 ͓514͔ and ph 9 2 ≠ n 1 2 ͓521͔, respectively [21].…”