α decay studies of the nuclides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>218</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>219</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Leppänen, A. P.; Uusitalo, J.; Leino, M.; Eeckhaudt, S.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Kettunen, H.; Kuusiniemi, P.; Nieminen, P.; Pakarinen, J.; Rahkila, P.; Scholey, C.; Sletten, G.

doi:10.1103/physrevc.75.054307

Cited by 78 publications

(50 citation statements)

References 23 publications

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“…In the next N = 126 isotone 218 U, the (πh 9/2 πf 7/2 )8 + isomeric state with α decay was found to fall below (πh 2 9/2 )6 + by Leppänen et al [3,4]. The results are in good agreement with the large-scale shell model calculations [5] and indicate that there is no subshell at Z = 92 [4].…”

supporting

confidence: 62%

α-decay properties of the new isotopeU216

Zhang

Gan

et al. 2015

Phys. Rev. C

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The new neutron-deficient isotope 216 U was produced in the complete-fusion reaction 180 W( 40 Ar ,4n) 216 U. The evaporation residues were separated from the primary beam in flight by the gas-filled recoil separator Spectrometer for Heavy Atoms and Nuclear Structure. The activities have been identified by the α-α position and time correlation measurements. Two α-decaying states with E α = 8384(30) keV, T 1/2 = 4.72 +4.72 −1.57 ms for the ground state and E α = 10582(30) keV, T 1/2 = 0.74 +1.34 −0.29 ms for an isomeric state were identified in 216 U.

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supporting

confidence: 62%

α-decay properties of the new isotopeU216

Zhang

Gan

et al. 2015

Phys. Rev. C

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“…Among them, α-decay is one of the most important decay modes for heavy and superheavy nuclei. α-decay can provide some reliable knowledge on nuclear structure [1][2][3][4][5][6][7], and are also used to identify new isotope or new element via the observation of α-decay from unknown parent nucleus to a known daughter nucleus. The α-decay was firstly observed by Rutherford one century ago and firstly interpreted as the consequence of quantum penetration of α particle by Gamow in 1928 [8].…”

Section: Introductionmentioning

confidence: 99%

Alpha-decay for heavy nuclei in the ground and isomeric states

Dong¹,

Zhang²,

Wang³

et al. 2010

Nuclear Physics A

113

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“…The experimental data come from Refs. [8][9][10] for Z = 89, 91, and 92, respectively and from the "Evaluated Nuclear Structure Data File" [4] for the others. the fully aligned state of the (πh 9/2 ) 2 (πi 13/2 ) 1 configuration, with I π = 29/2 + .…”

mentioning

confidence: 99%

First proton-pair breaking in semi-magic nuclei beyond132Sn and208Pb: Configuration of the long-lived isomer of
Astier
¹
,
Porquet
²

2013
Phys. Rev. C
6
1
13
0
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The close similarity between the shell structures in the 132 Sn and 208 Pb regions is a well known phenomenon. Thus, using the correspondence between the high-j orbits located above the Z = 50 and Z = 82 shell gaps, we discuss the evolutions of the fully aligned states with one broken proton pair in the N = 82 and N = 126 isotones. A long-lived isomeric state was discovered in 217 Pa more than thirty years ago and, despite two other experiments giving new experimental results, the discussions on its main properties (spin, parity, configuration) remained inconclusive. Then, using the comparison with the I π = 17/2 + isomeric state recently measured in 139 La, the isomeric state of 217 Pa is assigned as the fully aligned state of the (πh 9/2 ) 2 (πf 7/2 ) 1 configuration.Isomeric states occupy a prime position in nuclear structure study. As a general rule, their configuration is nearly pure, so their discovery enables the identification of single-particle states among a great number of other excited states of the nucleus. Then their properties can be compared to theoretical predictions. For instance, in odd-A nuclei close to magic numbers, the first long-lived isomers that were discovered are due to the M4 character of the isomeric transitions [1,2], which is explained by the difference in angular momentum of two orbits close in energy [3], such as p 1/2 -g 9/2 for N (Z) < 50, d 3/2 -h 11/2 for N (Z) < 82, and f 5/2 -i 13/2 for N < 126. Another mechanism is known to produce isomeric states in spherical nuclei close to magic numbers: the breaking of a high-j nucleon pair. When the angular momenta of the two nucleons are fully aligned, the overlap of their wave functions is maximized and their residual interaction is large. Thus the excitation energy of the state having the maximum spin (I max = 2j − 1) is lowered and its E2 decay towards the next state of the multiplet is slowed down. Textbook examples are the 8 + isomeric state (T 1/2 = 201 ns) in 210 Pb and the 8 + isomeric state (T 1/2 = 99 ns) in 210 Po, where the two nucleons outside the doubly magic core are located in the νg 9/2 and πh 9/2 orbits, respectively. Such isomeric states due to breaking of a high-j nucleon pair are also found in semi-magic nuclei having much more than two valence nucleons, for instance in the N = 82 isotones with 54 < Z < 60 and in the N = 126 isotones with 85 < Z < 92 [4].In the nuclear chart, the comparison of the regions lying above the two doubly magic nuclei, 132 Sn and 208 Pb, is very interesting since each single-particle state in the 132 Sn region can be related to one particular state in the 208 Pb region which only differs by one unit of orbital angular momentum [5]. These corresponding states have approximately the same ordering and spacing, so one may expect similarities in nuclei belonging to these two regions. In this paper, we discuss the properties of the fully aligned states with one broken proton pair involving the high-j orbits located above the Z = 50 gap in the N = 82 isotones with 52 Z 58. The isomeric state r...

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α decay studies of the nuclidesU218andU219

Cited by 78 publications

References 23 publications

α-decay properties of the new isotopeU216

α-decay properties of the new isotopeU216

Alpha-decay for heavy nuclei in the ground and isomeric states

First proton-pair breaking in semi-magic nuclei beyond132Sn and208Pb: Configuration of the long-lived isomer of
Astier
¹
,
Porquet
²

2013
Phys. Rev. C
6
1
13
0
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α decay studies of the nuclidesU218andU219

Cited by 78 publications

References 23 publications

α-decay properties of the new isotopeU216

α-decay properties of the new isotopeU216

Alpha-decay for heavy nuclei in the ground and isomeric states

First proton-pair breaking in semi-magic nuclei beyond132Sn and208Pb: Configuration of the long-lived isomer ofAstier1, Porquet2 2013Phys. Rev. C61130View full textAdd to dashboardCite

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First proton-pair breaking in semi-magic nuclei beyond132Sn and208Pb: Configuration of the long-lived isomer of
Astier
¹
,
Porquet
²

2013
Phys. Rev. C
6
1
13
0
View full text Add to dashboard Cite