On proton decay of nuclei with Z &gt; 50

Karnaukhov, V.A.; Ter-Akop'yan, G.M.

doi:10.1016/0031-9163(64)90987-4

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…In order to make a systematic treatment of direct proton radioactivity possible, it would be desirable to identify more cases of this decay mode. According to predictions of current mass formulae [3], there exist further candidates for direct proton decay among neighbouring, lighter odd-Z nuclei in the region 53_<Z<_67 as was stated already in 1964 by Karnaukhov and Ter-Akopyan [4]. Using heavy-ion induced fusion-evaporation reactions, on-line mass separation and decay spectroscopy, we first estimated overall efficiencies for known short-lived isotopes of promethium (Z= 61), europium (Z= 63), terbium (Z = 65), and holmium (Z = 67).…”

Section: Introductionmentioning

confidence: 86%

Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53?Z?67

et al. 1983

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The earlier preliminary assignment of a 1,055 +_6 keV proton line to direct proton decay of a47Tm is supported by cross bombardment measurements and by a negative result from a p0sitron-proton coincidence experiment. The half-life was remeasured to be 0.56 +0.04 s. For two types of thermal ion sources, overall efficiencies were estimated for on-line mass separation of known short-lived isotopes of promethium, europium, terbium, and holmium. Direct proton decay was searched for among very neutron-deficient isotopes of these elements, and of iodine and caesium. No evidence for direct proton decay was found. Based on estimated overall efficiencies, on calculated cross-sections, and on predictions from the gross-theory of fl decay, half-life limits for direct proton decay were deduced.

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Section: Introductionmentioning

confidence: 86%

Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53?Z?67

et al. 1983

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“…Direct proton emission has been predicted as new decay mode for the ground-states of very neutron deficient nuclei for a long time [1,2] and is expected to determine the borderline of nuclear stability. The study of this new exotic decay mode yields information about nuclear properties like masses, potential barriers and ground-state configurations far from the valley of/?-stability.…”

Section: Introductionmentioning

confidence: 99%

Groundstate proton radioactivity of nuclei in the tin region

Gillitzer

Hartel

Kienle

et al. 1987

Z. Physik A - Atomic Nuclei

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Dedicated to Professor Friedrich Beck on the occasion of his 60th birthdayProton radioactivities with decay energies of (0.98+0.08)MeV and (0.83___0.08)MeV were produced by the fusion reactions 58Ni + 58Ni ~ 116Ba, and 58Ni + 54Fe ~ ~ l ZXe*, and their halflives were measured to be (33 +_7)gs and (109+_ 17)gs, respectively. The intensities of the lines correspond to production cross sections of about 30 gb and 40 gb. The two activities are assigned to the direct proton decay of H3Cs and 1~ The measured halflives are compared with values calculated for d5/2 and g7/2 groundstates of 1~ and a13Cs and spectroscopic factors are deduced for the decays. An extensive search for the proton decay of 1~ produced in the reaction S~ p2n)l~ had a negative result, excluding decay energies between 0.5 MeV and 1.5 MeV for halflives between 10 ns and 5 s.

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“…Generally speaking, superallowed [J+ decay is not characteristic of nuclei with Z <N, which may be seen from comparison of Tel08 with other proton emitters of Table I. The possible emission of delayed protons by nuclei with Z>50 was first noted by Karnaukhov & Ter-Akopian (53). In Berkeley Siivola (44) conducted ex periments making use of a linear accelerator of heavy ions.…”

Section: Mg24 + Pmentioning

confidence: 99%

“…The possibility of several other events of this kind in the range of Z <50 (Ti39, SeM, Pd90, Cd96, Sn99) was mentioned in (20) . Obtaining proton-radioactive nuclei with Z >50 following f3+ decay of nuclei with even Z seems to be even more probable (53).…”

Section: Mg24 + Pmentioning

confidence: 99%

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1966

Annu. Rev. Nucl. Sci.

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Reactions (6) was published in more detail (9). Papers (7, 8) were discussed at the eighteenth Congress of the International Union of Pure and Applied Chemistry in Montreal (August 1961) (10). Different laboratories in the Soviet Union, Canada, and the United States initiated experiments that resulted in the discovery in 1962 of delayed-proton emission [Karnaukhov,12)], and in the first identification of an emit ter of delayed protons (Si26) in 1963 [Barton & McPherson (13)]. However, before describing delayed-proton emission further, let us briefly consider certain data concerning the decay of neutron-deficient nuclei. ON GENERAL DECAY CHARACTERISTICS FOR NEUTRON-DEFICIENT ISOTOPESAlong with proton and two-proton radioactivity, iJI" decay and, at Z >50, a decay are characteristic of highly neutron-deficient isotopes. Predictions of the properties of such nuclei are necessary for pre-orientation of experi ments on production of neutron-deficient species, and interpretation of the results obtained .. Direct and accurate evaluation of mass defects and decay energies becomes possible when there is sufficient information on the neutron excessive mirror nuclei or on excitation energies of various isospin states of nuclei for a given isobaric multiplet. First evaluations of this kind were made by Dzhelepov (5) and Baz ( 14). Later several simple relations that appeared valid for many new neutron-deficient nuclei were obtained and were used in experiments described below. For example, the relation

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On proton decay of nuclei with Z > 50

Cited by 10 publications

References 2 publications

Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53?Z?67

Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53?Z?67

Groundstate proton radioactivity of nuclei in the tin region

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