Lifetime measurements in 
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 to study shell evolution toward 
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Goldkuhle, A.; Fransen, C.; Blazhev, A.; Beckers, M.; Birkenbach, B.; Braunroth, T.; Clément, E.; Dewald, Α.; Dudouet, J.; Eberth, J.; Hess, H.; Jacquot, B.; Jolie, J.; Kim, Y.-H.; Lemasson, A.; Lenzi, S. M.; Li, H. J.; Litzinger, J.; Michelagnoli, C.; Müller-Gatermann, C.; Singh, B. S. Nara; Pérez-Vidal, R. M.; Ralet, D.; Reiter, P.; Vogt, A.; Warr, N.; Zell, K. O.; Ataç, A.; Barrientos, D.; Barthe-Dejean, C.; Boston, A. J.; Boston, H. C.; Bourgault, P.; Cacitti, J.; Cederwall, B.; Ciemała, M.; Cullen, D. M.; Domingo‐Pardo, C.; Foucher, Joséphine; Frémont, G.; Gadea, A.; Gangnant, P.; González, V.; Goupil, J.; Henrich, C.; Houarner, Ch.; Jean, M.; Judson, D. S.; Korichi, A.; Körten, W.; Labiche, M.; Lefèvre, A.; Legeard, L.; Legruel, F.; Leoni, S.; Ljungvall, J.; Maj, A.; Maugeais, C.; Ménager, Loïc; Ménard, Nelly; Menegazzo, R.; Mengoni, D.; Million, B.; Munoz, H.; Napoli, D. R.; Navin, A.; Nyberg, J.; Ozille, M.; Podolyák, Zs.; Pullia, A.; Raine, B.; Recchia, F.; Ropert, J.; Saillant, F.; Salsac, M. D.; Sanchís, E.; Schmitt, C.; Simpson, John; Spitaels, C.; Stézowski, O.; Theisen, Ch.; Toulemonde, M.; Tripon, M.; Dobón, J.-J. Valiente; Voltolini, G.; Zielińska, M.

doi:10.1103/physrevc.100.054317

Cited by 16 publications

(15 citation statements)

References 48 publications

(148 reference statements)

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“…(Color online) The calculated energy with respect to the α threshold E, excitation energy Ex, intercluster rms radii < R 2 > 1/2 and B(E2) values in unit of e 2 fm 4 for the J → J − 2 transitions for the N = 12 and N = 13 band states in 52 Ti. Theoretical B(E2) values are compared with the experimental data [49] and the shell model calculations [24]. be considered to form a rotational band, agrees well with R = 3.2 of the theoretical N = 14 band.…”

supporting

confidence: 52%

Existence of higher nodal band states withα+Ca48cluster structure inTi52

Ohkubo

2020

Phys. Rev. C

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It is shown that recently observed α cluster states a few MeV above the α threshold energy in 52 Ti correspond to the higher nodal band states with the α+ 48 Ca cluster structure, i.e. a vibrational mode in which the intercluster relative motion is excited. The existence of the higher nodal states in the 48 Ca core region in addition to the well-known higher nodal states in 20 Ne and 44 Ti reinforces the importance of the concept of vibrational motion due to clustering even in medium-weight nuclei with a jj-shell closed core. The higher nodal band and the shell-like ground band in 52 Ti are described in a unified way by a Luneburg lens-like deep local potential due to the Pauli principle, which explains the emergence of backward angle anomaly (anomalous large angle scattering (ALAS)) at low energies, prerainbows at intermediate energies and nuclear rainbows at high energies in α+ 48 Ca scattering. The existence of a K = 0 − α cluster band analog to 44 Ti midway between the ground band and the higher nodal band is inevitably predicted.The α clustering is essential in the 0p-shell and sd shell region and the nuclear structure has been comprehensively understood from the α cluster viewpoint [1]. In the f p shell region, identification of the higher nodal band states with the α+ 40 Ca cluster structure in the fusion excitation functions [2] lead to the prediction of a K = 0 − band, which is a parity-doublet partner of the ground band, in the typical nucleus 44 Ti [3-5]. The observation of the K = 0 − band in experiment [6,7] showed that the α cluster picture is also essential in 44 Ti. Systematic theoretical and experimental studies in the 44 Ti region [8][9][10][11][12][13] confirmed the existence of the α cluster in the beginning of the f p-shell above the double magic nucleus 40 Ca.α clustering aspects in nuclei beyond 44 Ti have been explored in the medium weight mass region around A=50 such as 48 Cr [14,15] and 46,50 Cr [16,17] as well as in the heavy mass region such as 94 Mo and 212 Po [18][19][20][21]. 52 Ti, which is a typical nucleus with two protons and two neutrons outside the doubly closed core 48 Ca analog to 20 Ne and 44 Ti, has been mostly studied in the shell model [22][23][24][25][26][27]. The ground band 0 + , 2 + and 4 + states are selectively enhanced in the α-transfer reactions such as 48 Ca( 16 O, 12 C) 52 Ti [28] and 48 Ca( 12 C, 8 Be) 52 Ti [29]. However a microscopic α+ 48 Ca cluster model calculation with Brink-Boeker force B1 using the generator coordinate method (GCM) [30] did not give the ground band as well as in the α+ 40 Ca cluster model calculation for 44 Ti. On the other hand, Ohkubo et al. [31] and Ohkubo and Hiraoka[32] reproduced the ground band of 52 Ti in the α cluster model with a local potential similar to 44 Ti [3, 4]. No experimental data that suggest clear α cluster states hampered to conclude that the α cluster picture persists in 52 Ti in the jj-shell closed 48 Ca core region. Very recently Bailey et al.[33] reported that they newly observed α cluster states at the highl...

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supporting

confidence: 52%

Existence of higher nodal band states withα+Ca48cluster structure inTi52

Ohkubo

2020

Phys. Rev. C

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“…To verify these findings, lifetimes of excited states are of great importance, since transition probabilities determined from these lifetimes can be used for testing the nuclear structure theories in this region. A recent publication presented new experimental results on 52,54 Ti allowing for an investigation of their nuclear structure [7]. The newly determined transition strengths in 52 Ti [7] contradict the previous results of Ref.…”

Section: Introductionmentioning

confidence: 59%

Lifetime measurements of excited states in neutron-rich Ti53 : Benchmarking effective shell-model interactions

Goldkuhle¹,

Blazhev²,

Fransen³

et al. 2020

Phys. Rev. C

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Level lifetimes of the yrast (5/2 − ) to 13/2 − states in the neutron-rich nucleus 53 Ti, produced in a multinucleon-transfer reaction, have been measured for the first time. The recoil distance Doppler-shift method was employed and lifetimes of the excited states were extracted by a lineshape analysis aided by Geant4-based Monte-Carlo simulations. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility in Caen, France, by using the Advanced Gamma Tracking Array for the γ-ray detection coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification and the Cologne plunger for deep-inelastic reactions. Reduced transition probabilities, deduced from the lifetimes, give new information on the nuclear structure of 53 Ti, and are used to benchmark different shell-model calculations using established interactions in the fp shell.

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“…The nucleus 54 Ti 32 with four neutrons closing the p 3/2 sub-shell could behave similar to 50 Ti 28 since to reach the 8 + 1 state one should break the (2p 3/2 ) 4 (N = 32) sub-shell closure. Similar arguments could also apply to 56 Ti 34 with the filling of the p 1/2 sub-shell if the N = 34 is a closed core as in 54 Ca. The position and character of the 8 + 1 is therefore very well suited to investigate sub-shell closures in these nuclei.…”

mentioning

confidence: 78%

“…The N = 32 gap determined in calcium (Z = 20) [3,4] has been found to persist in argon (Z = 18) [5], potassium (Z = 19) [6], scandium (Z = 21) [7], titanium (Z = 22) [8][9][10] and chromium (Z = 24) [11,12]. On the other hand, the N = 34 sub-shell closure has been suggested in 54 Ca [13][14][15] and in 52 Ar [16]. However, it has not been detected in the Sc [17], Ti [9,10,18] and the Cr [11,12] isotopes.…”

mentioning

confidence: 99%

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On the robustness of sub-shell closures: A high angular momentum analysis of the titanium isotopes

Rodrı́guez

Egido

2020

Physics Letters B

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The potential sub-shell closures N = 32 and N = 34 are analyzed at high spins in the titanium isotopes within the generalized beyond mean field theory considering triaxial deformations and the angular frequency as generator coordinates together with the particle number and the angular momentum conservation. A good description of bulk properties, high angular momenta spectra and transition probabilities is obtained. The outcome at high spin in these nuclei is consistent with the magic number character of N = 32 but not of N = 34.

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Lifetime measurements in Ti52,54 to study shell evolution toward N=32

Cited by 16 publications

References 48 publications

Existence of higher nodal band states withα+Ca48cluster structure inTi52

Existence of higher nodal band states withα+Ca48cluster structure inTi52

Lifetime measurements of excited states in neutron-rich Ti53 : Benchmarking effective shell-model interactions

On the robustness of sub-shell closures: A high angular momentum analysis of the titanium isotopes

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