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論文

Producing gold at ISOLDE-CERN

Barzakh, A. E.*; Andreyev, A. N.; Atanasov, D.*; Cubiss, J. G.*; Harding, R. D.*; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; 他38名*

Nuclear Instruments and Methods in Physics Research B, 513, p.26 - 32, 2022/02

https://doi.org/10.1016/j.nimb.2021.12.011
 被引用回数：1 パーセンタイル：22.33(Instruments & Instrumentation)

The yield of 18 beams of radioactive gold nuclei produced by irradiating the ISOLDE uranium target with 1.4-GeV protons was measured. The production-efficiency dependence on the half-life was derived using the in-target production calculations. Three release models were tested to describe the results. Irregularities in the efficiency curve for 3 long-lived high-spin gold isomers ($$^{187,191,193}$$Au$$^m$$) were found, which require further investigation.

論文

Laser-assisted nuclear decay spectroscopy of $$^{176,177,179}$$Au

Harding, R. D.*; Andreyev, A. N.; Barzakh, A. E.*; Cubiss, J. G.*; Van Duppen, P.*; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; 他26名*

Physical Review C, 104(2), p.024326_1 - 024326_16, 2021/08

https://doi.org/10.1103/PhysRevC.104.024326
 被引用回数：6 パーセンタイル：64.51(Physics, Nuclear)

A detailed nuclear spectroscopy study of $$^{176,177,179}$$Au was performed at ISOLDE, CERN. This work provides new insights into the low-lying levels in the daughter nuclei $$^{172,173,175}$$Ir. For $$^{176}$$Au, the nuclear magnetic moments of a high spin and low spin state were determined and used to predict the most likely configuration of each level. Their $$alpha$$-decay branching ratios were also extracted: a 58(5)% branching for the low-spin state, and 29(5)% for the high-spin state.

論文

Laser-assisted decay spectroscopy and mass spectrometry of $$^{178}$$Au

Cubiss, J. G.*; Andreyev, A. N.; Barzakh, A. E.*; Manea, V.*; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; Antalic, S.*; 他39名*

Physical Review C, 102(4), p.044332_1 - 044332_12, 2020/10

https://doi.org/10.1103/PhysRevC.102.044332
 被引用回数：7 パーセンタイル：59.72(Physics, Nuclear)

A comprehensive study of the isotope $$^{178}$$Au has been made at the CERN-ISOLDE facility, using resonance laser ionization. Two long-lived states in $$^{178}$$Au were identified - a low-spin ground state and a high-spin isomer - each of which were produced as pure beams. Using the ISOLTRAP precision Penning trap, the excitation energy of the isomeric state in $$^{178}$$Au was determined to be $$E^{*} = $$ 189(14) keV. The $$alpha$$-decay fine structure patterns of the two states were studied using the Windmill decay station, providing information on the low-lying states in the daughter nucleus $$^{174}$$Ir. Nuclear spin assignments of $$I(^{178}$$Au$$^{g}) = (2,3)$$ and $$I(^{178}$$Au$$^{m}) = (7,8)$$ are made based on the observed $$beta$$-decay feeding and hyperfine structure intensity patterns.

論文

$$beta$$-delayed fission of isomers in $$^{188}$$Bi

Andel, B.*; Andreyev, A. N.; Antalic, S.*; Al Monthery, M.*; Barzakh, A.*; Bissell, M. L.*; Chrysalidis, K.*; 他29名*

Physical Review C, 102(1), p.014319_1 - 014319_12, 2020/07

https://doi.org/10.1103/PhysRevC.102.014319
 被引用回数：9 パーセンタイル：64.40(Physics, Nuclear)

$$beta$$-delayed fission ($$beta$$DF) decay of a low-spin (ls) and a high-spin (hs) isomer in $$^{188}$$Bi was studied at the ISOLDE facility at CERN. Their $$beta$$DF partial half-lives were determined: $$T_{rm 1/2p}$$, $$beta$$DF($$^{188}$$Bi$$^{hs}$$)= 5.6(8) $$times$$ 10$$^{3}$$ s and $$T_{rm 1/2p}$$, $$beta$$DF($$^{188}$$Bi$$^{ls}$$)=1.7(6) $$times$$ 10$$^{3}$$ s. This work is the first $$beta$$DF study of two states in one isotope and allows the spin dependence of low-energy fission to be explored. The fission fragment mass distribution of a daughter nuclide $$^{188}$$Pb, following the $$beta$$ decay of the high-spin isomer, was deduced and indicates a mixture of symmetric and asymmetric fission modes.

論文

Shape coexistence in $$^{187}$$Au studied by laser spectroscopy

Barzakh, A. E.*; Atanasov, D.*; Andreyev, A. N.; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; Antalic, S.*; Blaum, K.*; 他34名*

Physical Review C, 101(6), p.064321_1 - 064321_7, 2020/06

https://doi.org/10.1103/PhysRevC.101.064321
 被引用回数：15 パーセンタイル：82.07(Physics, Nuclear)

Hyperfine-structure parameters and isotope shift of the $$9/2^{-}$$ isomeric state in $$^{187}$$Au relative to $$^{197}$$Au for the 267.6-nm atomic transition have been measured for the first time using the in-source resonance-ionization spectroscopy technique. The magnetic dipole moment and change in the mean-square charge radius for this $$9/2^{-}$$ isomer have been deduced. The observed large isomer shift relative to the $$1/2^{+}$$ ground state in $$^{187}$$Au confirms the occurrence of the shape coexistence in $$^{187}$$Au proposed earlier from the analysis of the nuclear spectroscopic data and particle plus triaxial rotor calculations. The analysis of the magnetic moment supports the previously proposed $$9/2^{-}$$, $$1/2^{-}$$[541] assignment at moderate prolate deformation for $$^{187}$$Au$$^{m}$$.

論文

Hyperfine anomaly in gold and magnetic moments of $$I^{pi}$$ = 11/2$$^{-}$$ gold isomers

Barzakh, A. E.*; Atanasov, D.*; Andreyev, A. N.; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; Antalic, S.*; Blaum, K.*; 他39名*

Physical Review C, 101(3), p.034308_1 - 034308_9, 2020/03

https://doi.org/10.1103/PhysRevC.101.034308
 被引用回数：28 パーセンタイル：94.40(Physics, Nuclear)

Hyperfine-structure constants for the $$I^{pi}$$ = 11/2$$^{-}$$ gold isomers $$^{177,191,193,195}$$Au$$^{m}$$ have been measured at CERN-ISOLDE, using the in-source laser resonance-ionization spectroscopy technique. From the measured hyperfine constants the differences between hyperfine anomalies have been deduced. These differential hyperfine anomaly values have been used to determine the hyperfine anomaly relative to the stable $$^{197}$$Au with advanced atomic calculations. Magnetic dipole moments for the gold isomers in question have been deduced, taking into account the corresponding relative hyperfine-anomaly values. It has been shown that the commonly used prescription for the extraction of the magnetic moment values for the gold isotopes should be reconsidered. The magnetic moments calculated by this prescription have been reevaluated by properly accounting for the hyperfine anomaly, which is as large as 10% for several gold isotopes.

論文

Identification of a 6.6$$mu$$s isomeric state in $$^{175}$$Ir

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; Barton, C. J.*; Antalic, S.*; Auranen, K.*; Badran, H.*; Cox, D.*; Cubiss, J. G.*; O'Donnell, D.*; et al.

Physical Review C, 99(6), p.064310_1 - 064310_6, 2019/06

https://doi.org/10.1103/PhysRevC.99.064310
 被引用回数：3 パーセンタイル：30.18(Physics, Nuclear)

An experiment has been performed to study excited states in the neutron-deficient nucleus $$^{175}$$Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyv$"a$skyl$"a$. By using isomer tagging, an isomeric state with a half-life of 6.58(15) $$mu$$s has been observed in $$^{175}$$Ir for the first time. It has been established that the isomer decays via a 45.2 ($$E1$$) - 26.1 ($$M1$$) keV cascade to new states below the previously reported ground state in $$^{175}$$Ir with $$I^{pi} = (5/2^{-})$$. We now reassign this $$(5/2^{-})$$ state to the isomeric state discovered in this study.

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