Angular momentum population in the fragmentation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>208</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:math>at 1 GeV/nucleon

Pfützner, M.; Regan, P. H.; Walker, P. M.; Caamaño, M.; Gerl, J.; Hellström, M.; Mayet, P.; Podolyák, Zs.; Mineva, MN; Aprahamian, A.; Benlliure, J.; Bruce, A. M.; Butler, P. A.; Gil, D.; Cullen, D. M.; Döring, J.; Enquist, T; Fox, C.; Narro, J. Garcés; Geißel, H.; Gelletly, W.; Giovinazzo, J.; Górska, M.; Grawe, H.; Grzywacz, R.; Kleinböhl, A.; Körten, W.; Lewitowicz, M.; Lucas, R.; Mach, H.; O’Leary, C. D.; Oliveira, F. de; Pearson, C. J.; Rejmund, F.; Rejmund, M.; Sawicka, M.; Schaffner, H.; Schlegel, C.; Schmidt, K.‐H.; Theisen, Ch.; Vivès, F.; Warner, D. D.; Wheldon, C.; Wollersheim, H. J.; Wooding, S. C.

doi:10.1103/physrevc.65.064604

Cited by 58 publications

(21 citation statements)

References 51 publications

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“…From the observed intensities in Fig. 2(a) ratio'' is similar to that observed for the 15 þ isomeric state in 96 Ag, but somewhat higher than our theoretical estimation of $2% [21,35].…”

supporting

confidence: 84%

16+Spin-Gap Isomer inCd96

Singh¹,

Liu²,

Wadsworth³

et al. 2011

Phys. Rev. Lett.

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A -decaying high-spin isomer in 96 Cd, with a half-life T 1=2 ¼ 0:29 þ0:11 À0:10 s, has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of 124 Xe on a 9 Be target. From the half-life and the observed decays in the daughter nucleus, 96 Ag, we conclude that the -decaying state is the long predicted 16 þ ''spin-gap'' isomer. Shell-model calculations, using the Gross-Frenkel interaction and the ðp 1=2 ; g 9=2 Þ model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the N ¼ Z ¼ 50 gaps and the Gamow-Teller strength, BðGTÞ distributions have been studied via large-scale shell-model calculations using the ðg; d; sÞ model space to compare with the experimental BðGTÞ value obtained from the half-life of the isomer. DOI: 10.1103/PhysRevLett.107.172502 PACS numbers: 21.60.Cs, 23.20.Lv, 23.35.+g, 26.20.Àf The nuclear landscape around the heaviest known bound doubly magic self-conjugate nucleus 100 Sn, which resides far from the valley of stability, exhibits a rich variety of nuclear structure phenomena [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. A feature of great interest in this region is the presence of isomeric states, especially those which may undergo particle decay. Indeed, early work by Peker et al. was paramount in motivating studies of such states based on three or four particle/hole configurations in nuclei. This included the 16 þ isomeric state in 96 Cd, which was suggested to result from a four-hole configuration relative to a 100 Sn core that may decay via proton radioactivity [1].A particularly interesting issue in this region is the role played by the neutron-proton, np, interaction in leading to the existence of the isomers. The isovector (T ¼ 1) component of the interaction between like-nucleons is known to dominate in all non-self-conjugate nuclei while the T ¼ 1 np interaction has been shown to have a major influence on the N ¼ Z line below mass 80 due to the large overlap of the proton and neutron wave functions [16]. Although calculations suggest an important influence of the isoscalar (T ¼ 0) np interaction on the structure of medium-heavy N ¼ Z nuclei, its role has been less clear and often debated [17][18][19][20]. Very recent experimental work has claimed the first indications for the crucial role of this interaction at low spins in 92 Pd, that are supported by shell-model (SM) calculations [2]. In order to establish or dispute the expected strong influence of the T ¼ 0 np interaction for self-conjugate nuclei close to 100 Sn, it is of paramount importance to obtain further evidence for its effects.Long standing SM calculations for the self-conjugate nucleus 96 Cd predict the presence of a 16 þ state at an energy lower than that of the first 12 þ and 14 þ states [10]. This situation arises from the strong influence of the T ¼ 0 np interaction and results in ''spin-...

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“…From the observed intensities in Fig. 2(a) ratio'' is similar to that observed for the 15 þ isomeric state in 96 Ag, but somewhat higher than our theoretical estimation of $2% [21,35].…”

supporting

confidence: 84%

16+Spin-Gap Isomer inCd96

Singh¹,

Liu²,

Wadsworth³

et al. 2011

Phys. Rev. Lett.

Self Cite

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“…The reaction properties have been quantified in terms of the key factors that govern their utility, such as the cross sections as a function of separation from the incident beam [192,410,411] and angular-momentum input/highspin population [410,412]. The very high velocities mean that fully stripped ions of even the heaviest nuclei predominate, and thus unambiguous Z and A identification [192] is possible.…”

Section: Relativistic Projectile Fragmentationmentioning

confidence: 99%

Review of metastable states in heavy nuclei

2016

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Abstract.The structure of nuclear isomeric states is reviewed in the context of their role in contemporary nuclear physics research. Emphasis is given to high-spin isomers in heavy nuclei, with A 150. The possibility to exploit isomers to study some of the most exotic nuclei is a recurring theme. In spherical nuclei, the role of octupole collectivity is discussed in detail, while in deformed nuclei the limitations of the K quantum number are addressed. Isomer targets and isomer beams are considered, along with applications related to energy storage, astrophysics, medicine, and experimental advances.

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“…[46] were determined for a majority of isomers in the 100 Sn region, including those that decay by particle emission. The mathematical expression for R exp is…”

Section: Experiments and Analysismentioning

confidence: 99%

“…The experimental isomeric ratios R exp were compared to theoretical predictions R theo as described in other experimental literature with various primary beam energies and projectile masses of fragmentation reactions [46,65,66]. The initial step of the theoretical calculations involves the final spin distribution of the fragments.…”

Section: F Comparison Of Experimental Isomeric Ratios To Theorymentioning

confidence: 99%

Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

Park¹,

Krücken²,

Lubos³

et al. 2017

Phys. Rev. C

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Half-lives and energies of γ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic 100 Sn were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV E2 γ ray from a new (4 + ) isomer with T 1/2 = 0.23(6) μs in 92 Rh, a 44-keV E2 γ ray from the (15 + ) isomer in 96 Ag, and T 1/2 (6 + ) = 13(2) ns in 98 Cd. Shell-model calculations of electromagnetic transition strengths in the (p 1/2 ,g 9/2 ) model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed γ rays in 100 Sn, new constraints on the T 1/2 , γ -ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in 100 Sn.

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Angular momentum population in the fragmentation of208Pbat 1 GeV/nucleon

Cited by 58 publications

References 51 publications

16+Spin-Gap Isomer inCd96

16+Spin-Gap Isomer inCd96

Review of metastable states in heavy nuclei

Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

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