The production of new neutron deficient isotopes of selenium and arsenic

Brecque, J. J. La; Preiss, I. L.

doi:10.1016/0022-1902(76)80180-7

Cited by 6 publications

(9 citation statements)

References 6 publications

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“…"Using the known atomic Q 0 = −17565.6 ± 2.2 keV for the 9 Be(π + ,π − ) 9 C(g.s.) reaction, we obtain the atomic Q 0 = −17930 ± 50 keV for the 58 [34] were incorrectly assigned to 65 Zn. Also, 65 Zn had been incorrectly observed to be stable [28,35].…”

Section: Discovery Of 54−85 Znmentioning

confidence: 85%

“…A π + beam with a central energy of 292 MeV hit a 58 Ni target to measure the (π + ,π − ) reaction at the Los Alamos Meson Physics Facility. 58 Zn was identified by the detection of negative pions π − measured using a modified version of the EPICS spectrometer. "Using the known atomic Q 0 = −17565.6 ± 2.2 keV for the 9 Be(π + ,π − ) 9 C(g.s.)…”

Section: Discovery Of 54−85 Znmentioning

confidence: 99%

“…Blank et al discovered 54 Zn in 2005 and reported their results in "First Observation of 54 Zn and its Decay by Two-Proton Emission" [17]. A 58 Ni beam was accelerated to 74.5 MeV/nucleon by the GANIL cyclotrons and bombarded a natural nickel target. The fragments were separated by the ALPHA-LISE3 separator and identified with four silicon detectors.…”

Section: Znmentioning

confidence: 99%

“…The reported half-life of 3.2( +18 −8 ) ms is the currently accepted half-life. Undiscovered, predicted to be bound GANIL cyclotrons accelerated a 58 Ni beam to 74.5 MeV/nucleon, which then bombarded a natural nickel target. The isotopes were separated with the SISSI/LISE3 facility and identified in a three-element silicon implantation telescope.…”

Section: Znmentioning

confidence: 99%

“…In 1993, Winger et al reported the discovery of 66 Se in "Half-life measurements for 61 Ga, 63 Ge, and 65 As and their importance in the rp process" [53]. A 75 MeV/nucleon 78 Kr beam from the Michigan State Cyclotron bombarded an enriched 58 Ni. 66 Se was separated and identified with the A1200 fragment separator.…”

Section: Sementioning

confidence: 99%

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Discovery of zinc, selenium, bromine, and neodymium isotopes

Gross

Claes

Kathawa

et al. 2012

Atomic Data and Nuclear Data Tables

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Currently, thirty-two zinc, thirty-two selenium, twenty-nine bromine and thirty-one neodymium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.[119]. A 40 Ca beam from the Berkeley SuperHILAC bombarded a gas-cooled 92 Mo target. 127 Nd was produced in the fusion-evaporation reaction 92 Mo( 40 Ca,αn) and identified with the on-line isotope separator OASIS. "From the growth and decay data, a half-life of 1.9 ± 0.4 s was deduced, which is in good agreement with the calculated value of 1.8 s for 127 Nd." This half-life is included in the currently accepted average value of 1.8(4) s. 128 NdIn 1985 128 Nd was identified by Lister et al. in "Deformation of Very Light Rare-Earth Nuclei" [120]. A 40 Ca beam from the Daresbury Laboratory Van de Graaff accelerator was incident on a 92 Mo target and 128 Nd was produced in the fusion-evaporation reaction 92 Mo( 40 Ca,2p2n). Gamma rays, neutrons and charged particles were detected and new ground-state bands observed. "This letter reports results on the ground-state bands in the even-even nuclei 128 ." An earlier identification and half-life measurement of 4(2) s [119] was later refuted [121]. 5.4. 129−133 Nd The first identification of 129 Nd, 130 Nd, 131 Nd, 132 Nd, and 133 Nd, was reported in 1977 by Bogdanov et al. in "New Neutron-Deficient Isotopes of Barium and Rare-Earth Elements" [122]. The Dubna U-300 Heavy Ion Cyclotron accelerated a 32 S beam which bombarded enriched targets of 102 Pd and 106 Cd. The isotopes were identified with the BEMS-2 isotope separator. "In the present paper, isotopes were mainly identified by measuring the γ-ray and X-ray spectra of the daughter nuclei formed as a result of measuring the β + decay. In addition, the decay curves of the total β-activity of given isobars have been measured." The reported half-life of 5.9(6) s for 129 Nd is close to the accepted value of 4.9(2) s. The half-life of 28(3) s for 130 Nd is within a factor of two of the currently accepted value of 13(3) s. The half-lives of 24(3) s ( 131 Nd) and 105(10) s ( 132 Nd) are included in the currently accepted average values of 25.4(9) s and 94(8) s. The half-life of 70(10) s for 133 Nd corresponds to the presently adopted half-life. 5.5. 134,135 Nd 134 Nd and 135 Nd were discovered by Abdurazakov et al. in the 1970 paper "New Isotopes 133 Pr, 134 Nd, and 135 Nd; Decay Schemes of 134 Pr and 135 Pr" [123]. Spallation reactions were induced by 660 MeV protons irradiating a gadolinium target at the Joint Institute for Nuclear Reactions in Dubna, Russia. The reaction products were then chemically separated and identified by the measured γ-ray spectra. " 134 Nd was identified and its half-life determined via the strongest γ rays of 134 Pr (T = 17±2 min) with energies 409.2 and 639.0 keV.[The figure] shows the build-up and decline of the intensity of the 409.2 keV γ lray of 134 Pr. The half-life of was found from the...

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