States of167Ho from the decay of neutron rich nuclide167Dy

Tuurnala, T.; Katajanheimo, R.; Hammarén, E.

doi:10.1007/bf01434358

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…The (4 + ) assignment of the l127.2keV state in Figure 2 is based on the assumption that this state is identical with the l124keV 4 + state seen in the reaction investigations of Tjom and Elbek [9] or Domingos, Symons and Douglas [10]. The (6 +) assignment given for the 2.76min aTorz-67"~U103 has a rather firm basis in systematics and theory: All the wellknown odd Z=67 isotopes 16a-~69Ho have the ~-[523~]p Nilsson state as their ground state [11,4,5], while the ground state of the N=103 isotones 171Er, 173yb and 175Hf is ~ [512]'], [11]. Since these are also the Nilsson model predictions (see e.g.…”

Section: Decay Schemementioning

confidence: 97%

“…Gamma-gamma and betagamma coincidences were investigated with the aid of a 512 ch x 512 ch or 256 ch x 1024 ch two parameter recording system. Detector properties, analysis of the spectra and other experimental details have been described more thoroughly in a previous report [4].…”

Section: Techniquesmentioning

confidence: 99%

“…The 7-7 coincidences were studied by using both the X-ray detector-coaxial and coaxial-coaxial detector combinations as described in [4]. The results of these two 512 ch x 512 ch experiments have been summed in Figure 1.…”

Section: Coincidence Measurementsmentioning

confidence: 99%

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Level structure of170Er observed in the decay of the 2.76 min170Ho

1978

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The/3--decay of the longer-lived l V~ isomer produced through the 17OEr(n ' p)lTOHo reaction has been investigated by using a versastile detector and coincidence equipment. The half-life and/3--decay energy were determined to be T1/2=2.76+0.05 min and Qp_ =3.85+0.15 MeV, respectively. In addition to the ground state band and some higher energy levels, the proposed level scheme of l~~ contains 11 states between 1.0 and 1.6 MeV (6 new ones), which are connected mutually by previously unknown low-energy transitions. Spin and/or parity assignments based mainly on coincidence data and multipolarity determinations are suggested for most of these states. By using systematic considerations and the nuclear projection model calculations several bands with K>2 can be assigned tentatively. As a side result the half-life of 169Ho was determined to be 4.7 _+ 0.2 min.

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Section: Decay Schemementioning

confidence: 97%

Section: Techniquesmentioning

confidence: 99%

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Level structure of170Er observed in the decay of the 2.76 min170Ho

1978

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“…Weisskopf hindrance factors; F W factors for low-lying isomeric states in odd-A Ho isotopes. Data from Refs [40][41][42][43]…”

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confidence: 99%

Isomeric and β -decay spectroscopy of Ho173,174

Liu¹,

Lee²,

Watanabe³

et al. 2020

Phys. Rev. C

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β-decay spectroscopy of 173,174 Ho (Z = 67, N = 106,107) was conducted at Radioactive Isotope Beam Factory at RIKEN by using in-flight fission of a 345-MeV/u 238 U primary beam. A previously unreported isomeric state at 405 keV with half-life of 3.7(12) μs and a spin and parity of (3/2 + ) is identified in 173 Ho. Moreover, a new state with a spin and parity of 9 − was discovered in 174 Er. The experimental log ft values of 5.84(20) and 5.25( 18) suggest an allowed-hindered β decay from the ground state of 174 Ho to the K π = 8 − isomeric state in 174 Er. Configuration-constrained potential energy surface (PES) calculations were performed and the predictions are in reasonable agreement with the experimental results.

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“…Unfortunately none of the excited states have so far been experimentally identified in the corresponding (A-1) nuclei, and as such we cannot make definitive quantitative predictions on the expected energies of the two-particle states. The closest neighbors with the same odd Z/N we could get are 167Ho [8] for the proton spectra and 171]~r [1] for the neutron spectra and this information is listed in ordering of the other two particle states in the spectrum of 17~ In Table2 we list the spin-parities of the two-particle states expected for E<300keV in ~7~ along with the numerical values for the matrix dements A 0 and A~ for the appropriate Nilsson potential parameters [9] and for the deformation parameter 5=0,28. For our estimates we use the average residual interaction parameters W=4MeV and ~=0.3 appropriate to this region [10].…”

mentioning

confidence: 98%

Low-lying intrinsic energy levels in the nucleus170Ho

Sood

1983

Z Physik A

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IndiaThe band-head energies of the two-quasiparticle states expected in the doubly odd deformed nucleus 170Ho are calculated for a zero range residual interaction. The results are compared with the available experimental information. It is concluded that the ground state has the Nilsson configuration 6 + {5-[5231"]p +~- [512]'],} being the 2.76m isomer whereas the 43s isomer is the 1 § 2;= 0 state arising from the same configuration and lies at about 100keV excitation energy in agreement with the experiment. The first excited state in this nucleus is predicted to be the 4-{~+[411]']p+-~-[521]'].} state close to the ground state with the corresponding 1-2;=0 member expected to appear well above the 1 § isomer.The energy levels of the odd-odd deformed nuclei, particularly the ones lying away from the stability line, are very poorly known. Low-lying isomers have been identified in several such cases but the structure and even the relative ordering of such isomers remain still an open question. The spin-parity assignments to many such isomers have not been unambiguously decided to this date. One particular example of this type is the doubly odd rare earth nucleus 1~~Two isomers with half-lives of 2.76 min and 43 s, respectively, have been identified for this nucleus. ' and, then considering the various choices, they tentatively assigned to it I'= 1 § placing it as the 2;= 0 member of the ground state GM pair. We have recently developed [5] a formalism for calculating the band-head energies of the intrinsic two-particle states in doubly odd deformed nuclei based on a quantitative evaluation of the zero range residual neutron-proton interaction contribution to the energy of such states. We [6] have also critically looked into the criteria for the applicability of the GM rule using our fomulation. The formalism has been successfully applied [7] to examine the relative placement of the close lying configurations in several cases. In the following we apply this formalism to the case of 17~ In our formalism we adopt the usual procedure of treating the two-quasi-particle states occurring in an odd-odd nucleus as arising from the superposition of the corresponding neutron and proton single particle Nilsson orbitals ~?~[Nn3AE ] as observed in the spectra of the neighboring odd-mass nuclei. Each (p., %) combination gives rise to two bands with K =K+-=[f2p+f2,1 in the odd-odd nucleus. The relative ordering of K + and K-bands is generally

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States of167Ho from the decay of neutron rich nuclide167Dy

Cited by 12 publications

References 16 publications

Level structure of170Er observed in the decay of the 2.76 min170Ho

Level structure of170Er observed in the decay of the 2.76 min170Ho

Isomeric and β -decay spectroscopy of Ho173,174

Low-lying intrinsic energy levels in the nucleus170Ho

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