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Makishima, Akio; Asai, Mitsuteru; Ishii, T.; Hossain, I.; Ogawa, Masahiro; Ichikawa, S.; Ishii, M.

doi:10.1103/physrevc.59.r2331

Cited by 42 publications

(11 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ordering was confirmed by coincidences with additional newly discovered transitions. The present level scheme, combined with the results reported in [3], suggest a 1.9-s 6 − ground state, which β decays to feed the 8 + 1 level of 80 Ge, as reported in [12]. The first excited state should then have spin and parity 3 − , corresponding to the long-lived isomer reported in [3].…”

Section: Resultssupporting

confidence: 80%

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
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A new level scheme of 80 Ga has been determined. This nucleus was populated following the β − decay of 80 Zn at ISOLDE, CERN. The proposed level scheme is significantly different compared to the previously reported one and contains 26 levels up to 3.4 MeV in excitation energy. The present study establishes that the previously identified 1.9-s β − -decaying 6 − isomer is the ground state of 80 Ga and the 1.3-s β − -decaying 3 − isomer lies at an excitation energy of 22.4 keV. A new isomeric level was identified at 707.8 keV and its half-life was measured to be 18.3(5) ns, allowing the 685.4-keV transition de-exciting this state to be assigned an M2 multipolarity. The newly measured spectroscopic observables are compared with shell-model calculations using the jj44bpn and JUN45 interactions.

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Section: Resultssupporting

confidence: 80%

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
View full text Add to dashboard Cite

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“…In the latter, only low-spin states in Ga are populated. Similar relative γ intensities were observed from both Ga samples, leading to the conclusion that no β-decaying isomeric state existed in 80 Ga. Makishima et al [3] later assigned a spin and parity of 8…”

supporting

confidence: 56%

“…3(d)]. In each calculation, a low-lying multiplet of states is observed with spins (3,4,5,6) − , but the ordering of these levels changes depending on the chosen proton model space. In all cases except when restricting the space to πp 3/2 ⊗ νg 9/2 , the gs is predicted to be the I π = 6 − state.…”

mentioning

confidence: 99%

Discovery of a long-lived low-lying isomeric state inGa80

et al. 2010

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Collinear laser spectroscopy was performed on the 80 Ga isotope at ISOLDE, CERN. A low-lying isomeric state with a half-life much greater than 200 ms was discovered. The nuclear spins and moments of the ground and isomeric states and the isomer shift are discussed. Probable spins and parities are assigned to both long-lived states (3 − and 6 − ) deduced from a comparison of the measured moments to shell-model calculations.

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“…States up to spin 8h have also been reported previously in the N = 48 isotone 82 Se, following deep-inelastic reactions [17,18], with a nanosecond isomer associated with the (νg 9 2 ) −2 , I π = 8 + seniority configuration at E x = 3519 keV. Such two-neutron-hole seniority isomers are a standard feature throughout the N = 48 isotonic chain [17,18]. Three γ rays of energy 1940, 231, and 442 keV were observed to decay from states above the E x = 3519 keV level in 82 Se.…”

supporting

confidence: 71%

“…Whilst definite spin and parity assignments were not possible for states in the current work, comparison with both shell-model calculations (see below) and other N = 48 isotones [17,18,22,23] 28 Ni 50 as closed core. The adopted single-particle energies are listed in Table I.…”

mentioning

confidence: 90%

Yrast studies ofSe80,82using deep-inelastic reactions

Jones¹,

Regan²,

Podolyák³

et al. 2007

Phys. Rev. C

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We report the results of an experiment in which we studied the near-yrast states in selenium isotopes approaching N = 50 following their population in multinucleon transfer reactions between a 82 Se beam and a 192 Os target. The level schemes for 80,82 Se derived from the current work are compared with restricted-basis shell-model calculations and pair-truncated shell-model calculations. These provide a good description of the yrast sequences in these nuclei using a basis space limited to excitations in the ν(p 3 2 , p 1 2 , g 9 2 ) and π ( The study of neutron-rich nuclei is of significant current interest. Of particular focus is the question of the robustness of magic numbers at N, Z = 28, 40, and 50, and the appearance of subshell closures at nucleon numbers 32 and 34 as a function of neutron/proton number. Single-particle monopole energy shifts between specific orbitals can result in a rearrangement of the traditional ordering of subshells associated with nearspherical nuclei [1,2], which in turn results in the appearance (removal) of new (traditional) magic numbers. Recent reports following initial studies with projectile fragmentation [3][4][5] and deep-inelastic reactions [6][7][8][9] have suggested a possible subshell closure for neutron number N = 32 (and perhaps N = 34), associated with a large single-particle gap between the neutron p 3 2 and p 1 2 orbitals. It has been proposed that a weakening of the proton-neutron π 1f 7 2 → ν1f 5 2 interaction and a significant ν2p 3 2 → ν2p 1 2 spin-orbit splitting result in the appearance of an N = 32 shell closure by lowering the p-shell neutron orbitals in energy with respect to the f 5 2 states. The states are inverted compared to the traditional near-stable ordering in which it is expected that the f 5 2 lies below the p 3 2 and p 1 2 , respectively. Monopole-energy shifts can be inferred from direct measurement of single-particle energies in odd-A nuclei or, alternatively, by identifying configuration-specific decays in the spectral sequences at higher spins [10]. This short article is intended to investigate the proton energy levels above the Z = 28 shell closure for N ∼ 50.The nuclei of interest were populated following heavy-ion, multinucleon transfer reactions with a thick target [8,9,11,12]. The beam of 82 Se ions of energy 460 MeV was provided by the tandem XTU and superconducting LINAC ALPI at the Laboratori Nazionali di Legnaro, Italy. The ions were incident on an isotopically enriched (97.8%) 192 Os target of thickness 50 mg/cm 2 backed with a 0.2 mm layer of Ta, thick enough to stop all the reaction products. Reaction γ rays were measured using the GASP spectrometer [13] consisting of 40 Compton-suppressed, coaxial, hyperpure germanium detectors and an 80 element inner BGO ball for γ -ray multiplicity and calorimetry measurements. Events consisting of at least 3 Compton-suppressed germaniums and 2 BGO elements within an event time of approximately 1 µs were written to tape for off-line analysis. The on-target beam current during the experiment ...

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(νg9/2−2)8+

Cited by 42 publications

References 7 publications

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
View full text Add to dashboard Cite

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
View full text Add to dashboard Cite

Discovery of a long-lived low-lying isomeric state inGa80

Yrast studies ofSe80,82using deep-inelastic reactions

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Product

Resources

About

(νg9/2−2)8+

Cited by 42 publications

References 7 publications

Low-lying isomeric states in Ga80 from the β− decay of ZnFraile1, Henryk2, Paziy3 2014Phys. Rev. C95180View full textAdd to dashboardCite

Low-lying isomeric states in Ga80 from the β− decay of ZnFraile1, Henryk2, Paziy3 2014Phys. Rev. C95180View full textAdd to dashboardCite

Discovery of a long-lived low-lying isomeric state inGa80

Yrast studies ofSe80,82using deep-inelastic reactions

Contact Info

Product

Resources

About

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
View full text Add to dashboard Cite

Low-lying isomeric states in Ga80 from the β− decay of Zn
Fraile¹,
Henryk²,
Paziy³
2014
Phys. Rev. C
9
5
18
0
View full text Add to dashboard Cite