Nuclear Data Sheets for A = 187

Basunia, M. S.

doi:10.1016/j.nds.2009.04.001

Cited by 76 publications

(56 citation statements)

References 219 publications

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“…3-7 It is shown in Fig. 3 that the theory agrees well with the experimental results of 187 Au [34] except for the 3/2 + 1 state. The experimental 3/2 + 1 state is nearly degenerate with the 1/2 + 1 ground state which may come from a single-particle excitation because the 3s 1/2 orbit is near the adjacent 2d 3/2 orbit.…”

Section: Comparison With Experimental Resultssupporting

confidence: 77%

“…In the following, we take the odd-A nuclei with the nearest even-even nuclei around the X(3) critical point as experimental candidates of the X(3/2j+1) symmetry. Specifically, because 186 Pt lies near the X(3) critical point [5], it is reasonable to take 187 Au [34] as an experimental candidate since the valence proton outside the even-even core in this case may occupy the 3s [40], and 151 Pm [41] may be taken as the X(3/2j+1) symmetry candidates. According to the shell model, the single valence proton in these odd-A nuclei may occupy the 2d 3/2 , 2p 3/2 , 2d 5/2 , and 2d 5/2 orbits, respectively.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

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Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

et al. 2011

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An analytically solvable model, X(3/ 2j + 1), is proposed to describe odd-A nuclei near the X(3) critical point. The model is constructed based on a collective core described by the X(3) critical point symmetry coupled to a spin-j particle. A detailed analysis of the spectral patterns for j = 1/2, 3/2 cases is provided to illustrate dynamical features of the model. Through comparing the theory with experimental data and results of other models, it is found that the X(3/ 2j + 1) model can be taken as a simple yet very effective scheme to describe those odd-A nuclei with an even-even core at the critical point of the spherical to axially deformed shape phase transition. I. IntroductionRecently, critical point symmetries [1][2][3][4][5] have attracted considerable attention, since they provide benchmark results for the study of even-even nuclei as they undergo a transition between two different phases (shapes) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In particular, the critical point of the spherical to γ-unstable shape transition [1], called E(5), and the critical point from the spherical to axially deformed shape [2], called X(5), have been confirmed by experiment [23][24][25][26]. In view of their successful application in helping to understand even-even systems, it seems critical point symmetries in odd-A systems warrant further investigation. And since the low-lying structures of two adjacent nuclei with more or less than one neutron or proton should be driven by similar collective considerations, the critical point symmetries observed in even-even systems should also be evident in the adjacent odd-A nuclei. The first case of a critical point Bose-Fermi symmetry, called E(5/4) [27], was developed by Iachello to describe, analytically, the γ-soft critical point E(5) configuration coupled to a j = 3/2 particle.135 Ba was suggested as an empirical example of E(5/4) symmetry, with a report of a detailed analysis given in [28]. While these results show significant agreement between theory and experiment, there are also some differences. Another critical point Bose-Fermi symmetry, called E(5/12) [29], was developed by Alonso, Arias, and Vitturi, who extended the case of the E(5/4) symmetry with a spin-j particle into the multi-j case with j = 1/2, 3/2, 5/2. Both the E(5/4) and E(5/12) models were developed to describe odd-A nuclei near even-even nuclei that display the E(5) critical point symmetry [1]; that is, nuclei in the spherical to γ-unstable transitional region. As the X(5) symmetry seems well confirmed in experiment [2], it provides a better test for exploring effects of the X(5) critical point symmetry in odd-A nuclei near the even-even partners at the X(5) critical point. Very recently, in the same spirit as the E(5/4) and E(5/12) examples, an X(5/ 2j+1) model that coupled a spin-j particle to the X(5) symmetry core was advanced [30].In this article, we propose an exactly solvable model, called X(3/ 2j+1), based on the X(3) critical point symmetry [5]. Although the original X(5/ ...

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Section: Comparison With Experimental Resultssupporting

confidence: 77%

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

et al. 2011

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“…The yield functions were divided by neutron flux to produce excitation functions for each distinct γ-ray energy. For γ rays originating from the 187 Re(n, 2nγ) 186 Re channel, the excitation functions rise quickly following the 187 Re neutron separation energy of S n = 7.3568 MeV [26] to peak at neutron energies between 10 and 20 MeV [27], then decrease rapidly as the (n, 3nγ) reaction becomes energetically favorable. The distinctive shape of the (n, 2nγ) excitation functions distinguishes the 186 Re γ rays from those produced in the (n, n ′ γ) and (n, 3nγ) reaction channels, which result in excitation functions that rise and peak at neutron energies approximately 7.5 MeV lower or higher, respectively, than that of the (n, 2nγ) channel.…”

Section: Analysis and Resultsmentioning

confidence: 99%

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
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The spallation neutron source at the Los Alamos Neutron Science Center Weapons Neutron Research facility was used to populate excited states in 186 Re via (n, 2nγ) reactions on an enriched 187 Re target. Gamma rays were detected with the the GErmanium Array for Neutron Induced Excitations spectrometer, a Compton-suppressed array of 18 HPGe detectors. Incident neutron energies were determined by the time-of-flight technique and used to obtain γ-ray excitation functions for the purpose of identifying γ rays by reaction channel. Analysis of the singles γ-ray spectrum gated on the neutron energy range 10 ≤ En ≤ 25 MeV resulted in five transitions and one level added to the 186 Re level scheme. The additions include the placement of three γ rays at 266.7, 381.2, and 647.7 keV which have been identified as feeding the 2.0 × 10 5 yr, J π = (8 + ) isomer and yield an improved value of 148.2(5) keV for the isomer energy. These transitions may have astrophysical implications related to the use of the Re/Os cosmochronometer.

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“…The JYFLTRAP measurement revealed the Q value to be record-setting low 0.35(17) keV, which is an order of magnitude smaller than 2.469(4) keV, the Q value of 187 Re beta decay [4]. The HADES measurements for the half-life and branching ratio, 4.1(6) × 10 20 y and 1.07(17)× 10 −6 , were in perfect agreement with the results of Cattadori et al [1], 3.7(10)× 10 20 y and 1.2(3) × 10 −6 , respectively.…”

mentioning

confidence: 83%

Neutrino mass, neutrinoless double electron capture and rare beta decays

Mustonen¹,

Suhonen²

2010

J. Phys.: Conf. Ser.

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Neutrino mass, neutrinoless double electron capture and rare beta decays Abstract. We present results of our theoretical calculations on three nuclei of interest from the neutrino-physics point of view: Firstly, we present the second-forbidden decay branch of 115 In with the ultra-low Q value and theoretical open questions related to such decays. Secondly, we have calculated estimates for the half-lives of the single-beta decay channels of 96 Zr and concluded that the possible contamination from those to the geochemical measurements of 96 Zr double-beta-decay half-life is rather small. Thirdly, we have taken a look at the neutrinoless resonance double-electron-capture decay of 112 Sn in the light of recent JYFLTRAP Q value measurements and discovered that the badly fulfilled resonance condition renders the decay unobservable.

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Nuclear Data Sheets for A = 187

Cited by 76 publications

References 219 publications

Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
View full text Add to dashboard Cite

Neutrino mass, neutrinoless double electron capture and rare beta decays

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Nuclear Data Sheets for A = 187

Cited by 76 publications

References 219 publications

Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

Simple description of odd-Anuclei around the critical point of the spherical to axially deformed shape phase transition

New transitions and feeding of theJπ=(8+)isomer inRe186Matters1, Fotiades2, Carroll3 et al. 2015Phys. Rev. C71100View full textAdd to dashboardCite

Neutrino mass, neutrinoless double electron capture and rare beta decays

Contact Info

Product

Resources

About

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
View full text Add to dashboard Cite