Related papers: Spectroscopy of $^{28}$Na: shell evolution toward …

$^{35,37,39}$S isotopes in $sd-pf$ space : Shell-model interpretation

The structure of $^{35,37,39}$S isotopes is described by performing comprehensive shell model calculations with SDPF-U and SDPFMW interactions. Protons and neutrons are restricted to the $sd$-shell for $N < 20$, neutrons start to fill the…

Nuclear Theory · Physics 2017-03-08 Archana Saxena , P. C. Srivastava , Jorge G. Hirsch , V. K. B. Kota , M. J. Ermamatov

Nuclear structure beyond the neutron drip line: the lowest energy states in $^9$He via their T=5/2 isobaric analogs in $^9$Li

The level structure of the very neutron rich and unbound $^9$He nucleus has been the subject of significant experimental and theoretical study. Many recent works have claimed that the two lowest energy $^9$He states exist with spins…

Nuclear Experiment · Physics 2017-02-22 E. Uberseder , G. V. Rogachev , V. Z. Goldberg , E. Koshchiy , B. T. Roeder , M. Alcorta , G. Chubarian , B. Davids , C. Fu , J. Hooker , H. Jayatissa , D. Melconian , R. E. Tribble

Nuclear structure study around Z=28

Yrast levels of Ni, Cu and Zn isotopes for $40 \leq N \leq50$ have been described by state-of-the-art shell model calculations with three recently available interactions using $^{56}$Ni as a core in the $f_{5/2}pg_{9/2}$ model space. The…

Nuclear Theory · Physics 2012-02-16 P. C. Srivastava , I. Mehrotra

Shape coexistence at the proton drip-line: First identification of excited states in 180Pb

Excited states in the extremely neutron-deficient nucleus, 180Pb, have been identified for the first time using the JUROGAM II array in conjunction with the RITU recoil separator at the Accelerator Laboratory of the University of Jyvaskyla.…

Nuclear Experiment · Physics 2014-11-20 P. Rahkila , D. G. Jenkins , J. Pakarinen , C. Gray-Jones , P. T. Greenlees , U. Jakobsson , P. Jones , R. Julin , S. Juutinen , S. Ketelhut , H. Koivisto , M. Leino , P. Nieminen , M. Nyman , P. Papadakis , S. Paschalis , M. Petri , P. Peura , O. J. Roberts , T. Ropponen , P. Ruotsalainen , J. Saren , C. Scholey , J. Sorri , A. G. Tuff , J. Uusitalo , R. Wadsworth , M. Bender , P. -H. Heenen

Spectroscopy of neutron-unbound $^{27,28}$F

The ground state of $^{28}$F has been observed as an unbound resonance $2\underline{2}0$ keV above the ground state of $^{27}$F. Comparison of this result with USDA/USDB shell model predictions leads to the conclusion that the $^{28}$F…

Nuclear Experiment · Physics 2015-06-04 G. Christian , N. Frank , S. Ash , T. Baumann , P. A. DeYoung , J. E. Finck , A. Gade , G. F. Grinyer , B. Luther , M. Mosby , S. Mosby , J. K. Smith , J. Snyder , A. Spyrou , M. J. Strongman , M. Thoennessen , M. Warren , D. Weisshaar , A. Wersal

Quadrupole-quadrupole interaction calculations which include N=2 mixing

We carry out a study of the study of the $Q \cdot Q$ interaction in a model space which consists of several nucleons in an open shell and all $2 \hbar \omega$ excitations. This interaction is $ -t (X_o/2) Q \cdot Q$, where for t=1 we get…

Nuclear Theory · Physics 2016-09-08 M. S. Fayache , L. Zamick , Y. Y. Sharon

Collapse of the $N=28$ shell closure in the newly discovered $^{39}$Na and the development of deformed halos towards the neutron dripline

Halos and changes of nuclear magicities have been extensively investigated in exotic nuclei during past decades. The newly discovered $^{39}$Na with the neutron number $N=28$ provides a new platform to explore such novel phenomena near the…

Nuclear Theory · Physics 2023-05-10 K. Y. Zhang , P. Papakonstantinou , M. -H. Mun , Y. Kim , H. Yan , X. -X. Sun

The neutron skin thickness from the measured electric dipole polarizability in $^{68}$Ni, $^{120}$Sn, and $^{208}$Pb

The information on the symmetry energy and its density dependence is deduced by comparing the available data on the electric dipole polarizability $\alpha_D$ of ${}^{68}$Ni, ${}^{120}$Sn, and ${}^{208}$Pb with the predictions of the Random…

Nuclear Theory · Physics 2015-12-10 X. Roca-Maza , X. Viñas , M. Centelles , B. K. Agrawal , G. Colo' , N. Paar , J. Piekarewicz , D. Vretenar

The $\beta$-decay properties of $N=Z$ nuclei: Role of neutron-proton pairing and the shell model interpretation

We study the recently measured beta-decay of $^{70}$Kr into $^{70}$Br within the framework of the large-scale shell model. The enhancement in the Gamow-Teller (GT) transition strength in $^{70}$Br compared to the $\beta$-decay of the…

Nuclear Theory · Physics 2025-07-17 Priyanka Choudhary , Chong Qi

Pairing and shell evolution in neutron rich nuclei

From the experimental data on odd-even staggering of masses, we have shown that variation of pairing as a function of neutron number plays an important role in many distinctive features like occurrence of new shell closures, shell erosion,…

Nuclear Theory · Physics 2012-04-24 M. Saha Sarkar , S. Sarkar

Determination of the spins and parities for the 0$_{4}^{+}$ and 0$_{5}^{+}$ states in $^{100}$Zr

Two 0$^{+}$ states at 1294.5 and 1774.0 keV, together with three 2$^{+}$ and one 4$^{+}$ levels, were identified or unambiguously spin-parity assigned for the first time in $^{100}$Zr utilizing $\gamma$-ray spectroscopy and…

Nuclear Experiment · Physics 2024-02-15 J. Wu , M. P. Carpenter , F. G. Kondev , R. V. F. Janssens , S. Zhu , E. A. McCutchan , A. D. Ayangeakaa , J. Chen , J. Clark , D. J. Hartley , T. Lauritsen , N. Pietralla , G. Savard , D. Seweryniak , V. Werner

Staggering behavior of 0^+ state energies in the Sp(4) pairing model

We explore, within the framework of an algebraic sp(4) shell model, discrete approximations to various derivatives of the energies of the lowest isovector-paired 0^+ states of atomic nuclei in the 40 <A < 100 mass range. The results show…

Nuclear Theory · Physics 2008-11-26 K. D. Sviratcheva , A. I. Georgieva , J. P. Draayer

Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O

The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoret- ically. In this first R3B-LAND experiment, the unbound states are populated at GSI via proton- knockout reactions from 26F and 27F at…

Nuclear Experiment · Physics 2019-08-15 C. Caesar , J. Simonis , T. Adachi , Y. Aksyutina , J. Alcantara , S. Altstadt , H. Alvarez-Pol , N. Ashwood , T. Aumann , V. Avdeichikov , M. Barr , S. Beceiro , D. Bemmerer , J. Benlliure , C. A. Bertulani , K. Boretzky , M. J. G. Borge , G. Burgunder , M. Caamano , E. Casarejos , W. Catford , J. Cederkäll , S. Chakraborty , M. Chartier , L. Chulkov , D. Cortina-Gil , U. Datta Pramanik , P. Diaz Fernandez , I. Dillmann , Z. Elekes , J. Enders , O. Ershova , A. Estrade , F. Farinon , L. M. Fraile , M. Freer , M. Freudenberger , H. O. U. Fynbo , D. Galaviz , H. Geissel , R. Gernhäuser , P. Golubev , D. Gonzalez Diaz , J. Hagdahl , T. Heftrich , M. Heil , M. Heine , A. Heinz , A. Henriques , M. Holl , J. D. Holt , G. Ickert , A. Ignatov , B. Jakobsson , H. T. Johansson , B. Jonson , N. Kalantar-Nayestanaki , R. Kanungo , A. Kelic-Heil , R. Knöbel , T. Kröll , R. Krücken , J. Kurcewicz , M. Labiche , C. Langer , T. Le Bleis , R. Lemmon , O. Lepyoshkina , S. Lindberg , J. Machado , J. Marganiec , V. Maroussov , J. Menéndez , M. Mostazo , A. Movsesyan , A. Najafi , T. Nilsson , C. Nociforo , V. Panin , A. Perea , S. Pietri , R. Plag , A. Prochazka , A. Rahaman , G. Rastrepina , R. Reifarth , G. Ribeiro , M. V. Ricciardi , C. Rigollet , K. Riisager , M. Röder , D. M. Rossi , J. Sanchez del Rio , D. Savran , H. Scheit , A. Schwenk , H. Simon , O. Sorlin , V. Stoica , B. Streicher , J. Taylor , O. Tengblad , S. Terashima , R. Thies , Y. Togano , E. Uberseder , J. Van de Walle , P. Velho , V. Volkov , A. Wagner , F. Wamers , H. Weick , M. Weigand , C. Wheldon , G. Wilson , C. Wimmer , J. S. Winfield , P. Woods , D. Yakorev , M. V. Zhukov , A. Zilges , M. Zoric , K. Zuber , R3B collaboration

Extending the Southern Shore of the Island of Inversion to $^{28}$F

Detailed spectroscopy of the neutron-unbound nucleus $^{28}$F has been performed for the first time following proton/neutron removal from $^{29}$Ne/$^{29}$F beams at energies around 230 MeV/nucleon. The invariant-mass spectra were…

Nuclear Experiment · Physics 2020-08-26 A. Revel , O. Sorlin , F. M. Marques , Y. Kondo , J. Kahlbow , T. Nakamura , N. A. Orr , F. Nowacki , J. A. Tostevin , C. X. Yuan , N. L. Achouri , H. Al Falou , L. Atar , T. Aumann , H. Baba , K. Boretzky , C. Caesar , D. Calvet , H. Chae , N. Chiga , A. Corsi , H. L. Crawford , F. Delaunay , A. Delbart , Q. Deshayes , Z. Dombradi , C. A. Douma , Z. Elekes , P. Fallon , I. Gasparic , J. -M. Gheller , J. Gibelin , A. Gillibert , M. N. Harakeh , W. He , A. Hirayama , C. R. Hoffman , M. Holl , A. Horvat , A. Horvath , J. W. Hwang , T. Isobe , N. Kalantar-Nayestanaki , S. Kawase , S. Kim , K. Kisamori , T. Kobayashi , D. Korper , S. Koyama , I. Kuti , V. Lapoux , S. Lindberg , S. Masuoka , J. Mayer , K. Miki , T. Murakami , M. Najafi , K. Nakano , N. Nakatsuka , T. Nilsson , A. Obertelli , F. de Oliveira Santos , H. Otsu , T. Ozaki , V. Panin , S. Paschalis , D. Rossi , A. T. Saito , T. Saito , M. Sasano , H. Sato , Y. Satou , H. Scheit , F. Schindler , P. Schrock , M. Shikata , Y. Shimizu , H. Simon , D. Sohler , L. Stuhl , S. Takeuchi , M. Tanaka , M. Thoennessen , H. Tornqvist , Y. Togano , T. Tomai , J. Tscheuschner , J. Tsubota , T. Uesaka , Z. Yang , M. Yasuda , K. Yoneda

Pairing and continuum effects on low-frequency quadrupole vibrations in deformed Mg isotopes close to the neutron drip line

Low-frequency quadrupole vibrational modes in deformed $^{36,38,40}$Mg close to the neutron drip line are studied by means of the quasiparticle-random-phase approximation based on the coordinate-space Hartree-Fock-Bogoliubov formalism.…

Nuclear Theory · Physics 2007-05-23 K. Yoshida , M. Yamagami , K. Matsuyanagi

Single-particle structure of the N = 20 and N = 28 isotones within the dispersive optical model

The neutron single-particle characteristics of the N = 20, 28 isotones at 8 < Z < 30 was calculated within the dispersive optical model. The global parameters of the spin-orbit and imaginary parts of the potential as well as surface…

Nuclear Theory · Physics 2019-02-27 O. V. Bespalova , A. A. Klimochkina

Unveiling the intruder deformed 0$^+_2$ state in $^{34}$Si

The 0$^+_2$ state in $^{34}$Si has been populated at the {\sc Ganil/Lise3} facility through the $\beta$-decay of a newly discovered 1$^+$ isomer in $^{34}$Al of 26(1) ms half-life. The simultaneous detection of $e^+e^-$ pairs allowed the…

Nuclear Experiment · Physics 2012-09-03 F. Rotaru , F. Negoita , S. Grévy , J. Mrazek , S. Lukyanov , F. Nowacki , A. Poves , O. Sorlin , C. Borcea , R. Borcea , A. Buta , L. Caceres , S. Calinescu , R. Chevrier , Zs. Dombradi , J. M. Daugas , D. Lebhertz , Y. Penionzhkevich , C. Petrone , D. Sohler , M. Stanoiu , J. C. Thomas

Ground-state properties of light $4n$ self-conjugate nuclei in $ab$ $initio$ no-core Monte Carlo shell model calculations with nonlocal $NN$ interactions

We report $J^\pi = 0^+$ ground-state energies and point-proton radii of $^4$He, $^8$Be, $^{12}$C, $^{16}$O and $^{20}$Ne nuclei calculated by the $ab$ $initio$ no-core Monte Carlo shell model with the JISP16 and Daejeon16 nonlocal $NN$…

Nuclear Theory · Physics 2021-11-29 T. Abe , P. Maris , T. Otsuka , N. Shimizu , Y. Utsuno , J. P. Vary

Anapole Correlations in Sr2IrO4 Defy the jeff = 1/2 Model

Zel'dovich (spin) anapole correlations in Sr2IrO4 unveiled by magnetic neutron diffraction contravene the spin-orbit coupled ground state used by the jeff = 1/2 (pseudo-spin) model. Specifically, spin and space know inextricable knots which…

Strongly Correlated Electrons · Physics 2019-12-25 D D Khalyavin , S W Lovesey

Enhanced spin-dependent parity non-conservation effect in the $7s {}^2S_{1/2} \to 6d {}^2D_{5/2}$ transition in Fr: A possibility for unambiguous detection of nuclear anapole moment

Employing the relativistic coupled-cluster method, comparative studies of the parity non-conserving electric dipole amplitudes for the $7s \ ^2S_{1/2} \rightarrow 6d \ ^2D_{5/2}$ transitions in $^{210}$Fr and $^{211}$Fr isotopes have been…

Atomic Physics · Physics 2016-04-06 B. K. Sahoo , T. Aoki , B. P. Das , Y. Sakemi