Particle-Number Reprojection in the Shell Model Monte Carlo Method: Application to Nuclear Level Densities

We introduce a particle-number reprojection method in the shell model Monte Carlo that enables the calculation of observables for a series of nuclei using a Monte Carlo sampling for a single nucleus. The method is used to calculate nuclear level densities in the complete $(pf+g_{9/2})$-shell using a good-sign Hamiltonian. Level densities of odd-A and odd-odd nuclei are reliably extracted despite an additional sign problem. Both the mass and the $T_z$ dependence of the experimental level densities are well described without any adjustable parameters. The single-particle level density parameter is found to vary smoothly with mass. The odd-even staggering observed in the calculated backshift parameter follows the experimental data more closely than do empirical formulae.Comment: 14 pages, 4 eps figures included, RevTe

Chaotic wave functions and exponential convergence of low-lying energy eigenvalues

We suggest that low-lying eigenvalues of realistic quantum many-body hamiltonians, given, as in the nuclear shell model, by large matrices, can be calculated, instead of the full diagonalization, by the diagonalization of small truncated matrices with the exponential extrapolation of the results. We show numerical data confirming this conjecture. We argue that the exponential convergence in an appropriate basis may be a generic feature of complicated ("chaotic") systems where the wave functions are localized in this basis.Comment: 4 figure

Parity Dependence of Nuclear Level Densities

A simple formula for the ratio of the number of odd- and even-parity states as a function of temperature is derived. This formula is used to calculate the ratio of level densities of opposite parities as a function of excitation energy. We test the formula with quantum Monte Carlo shell model calculations in the $(pf+g_{9/2})$-shell. The formula describes well the transition from low excitation energies where a single parity dominates to high excitations where the two densities are equal.Comment: 14 pages, 4 eps figures included, RevTe

Benchmark Test Calculation of a Four-Nucleon Bound State

In the past, several efficient methods have been developed to solve the Schroedinger equation for four-nucleon bound states accurately. These are the Faddeev-Yakubovsky, the coupled-rearrangement-channel Gaussian-basis variational, the stochastic variational, the hyperspherical variational, the Green's function Monte Carlo, the no-core shell model and the effective interaction hyperspherical harmonic methods. In this article we compare the energy eigenvalue results and some wave function properties using the realistic AV8' NN interaction. The results of all schemes agree very well showing the high accuracy of our present ability to calculate the four-nucleon bound state.Comment: 17 pages, 1 figure

One maternal lineage leads the expansion of Thaumastocoris peregrinus (Hemiptera: Thaumastocoridae) in the new and old worlds.

The bronze bug, Thaumastocoris peregrinus, an Australian native insect, has become a nearly worldwide invasive pest in the last 16 years and has been causing signifcant damage to eucalypts (Myrtaceae), including Eucalyptus spp. and Corymbia spp. Its rapid expansion leads to new questions about pathways and routes that T. peregrinus used to invade other continents and countries. We used mtDNA to characterize specimens of T. peregrinus collected from 10 countries where this species has become established, including six recently invaded countries: Chile, Israel, Mexico, Paraguay, Portugal, and the United States of America. We then combined our mtDNA data with previous data available from South Africa, Australia, and Europe to construct a world mtDNA network of haplotypes. Haplotype A was the most common present in all specimens of sites sampled in the New World, Europe, and Israel, however from Australia second more frequently. Haplotype D was the most common one from native populations in Australia. Haplotype A difers from the two major haplotypes found in South Africa (D and G), confrming that at least two independent invasions occurred, one from Australia to South Africa, and the other one from Australia to South America (A). In conclusion, Haplotype A has an invasion success over many countries in the World. Additionally, analyzing data from our work and previous reports, it is possible to suggest some invasive routes of T. peregrinus to predict such events and support preventive control measures

The nuclear collective motion

Current developments in nuclear structure are discussed from a theoretical perspective. First, the progress in theoretical modeling of nuclei is reviewed. This is followed by the discussion of nuclear time scales, nuclear collective modes, and nuclear deformations. Some perspectives on nuclear structure research far from stability are given. Finally, interdisciplinary aspects of the nuclear many-body problem are outlined

Nabis (Nabis) pseudoferus subsp. orientarius Remane 1963

<i>Nabis (Nabis) pseudoferus orientarius</i> Remane, 1963 <p>(Figs. 20, 34, 38, 42, 52, 67)</p> <p> <b>Material examined.</b> Har Hermon, 2000m, 28.x.1968, P. Amitai (1♂), 22.v.1973, D. Furth (3♂), 19.vi.1973, A. Freidberg (1♀), 27.vi.1973, D. Furth (1♀), 9.vi.1983, Y. Zvik (1♀), 30.x.1985, I. Susman (1♀), 20.v.1986, A. Freidberg (1♀), 6.vii.1987, Y. Zvik (1♀), 12.vi.1996 (1♂); 1900m, 22.v.1973, D. Furth (1♂), 1.vii.1986, A. Freidberg (1♀), 9.vii.1987, A. Freidberg (1♀); 1700m, 16.v.1977, A. Freidberg (1♀), 8.vi.1983, Y. Zvik (1♂); 1650m, 8.v.1975, J. Kugler (1♂), 6.v.1979, D. Furth (1♂); 1600m, 23.ix.1972, M. Kaplan, (fifth instar), 2.vii.1986, A. Shlagman (1♂, 1♀), 7.vii.1987, Y. Zvik (1♂, 1♀); 1400 - 1600m, 24.v.1983, A. Freidberg (1♂); 1500m, 24.v.1983, Y. Zvik (3♂, 1♀), 29.v.1984, I. Yarom (1♀), 1200m, 9.vi.1983, Y. Zvik (1♂); Har Dov, 8.vi.1983, Y. Zvik (2♂, 1♀); Gadot, 12.v.1973, D. Furth (1♀); Kefar Szold, 13.v.1973, D. Furth (1♀); Qusbiye, 28.iv.1978, D. Furth (1♂); Kare Deshe, 7.v.1973, D. Furth (1♀); Mt. Meron 1100m, 10.vi.1987, A. Shlagman (1♂); Dor, 11.vi.1986, I. Susman (1♂); Netanya, 28.iv.1979, D. Furth (1♀); Ramat Hovav, 2.ix.1985, I. Nissbaum (1♂).</p> <p> <b>Distribution.</b> Palaearctic. Europe, Mediterranean Basin. This subspecies is recorded from Cyprus, Asian Turkey, Lebanon, Iraq and Iran (Kerzhner, 1996). General distribution in Israel: Fig. 67.</p> <p> <b>Previous records.</b> None. Newly recorded for the study area.</p> <p> <b>Biology.</b> This species lives on herbs and in cultivated fields (Kerzhner, 1981).</p>Published as part of <i>Novoselsky, T., Freidberg, A., Dorchin, N., Meltzer, N. & Kerzhner, I., 2014, The Nabidae (Hemiptera: Heteroptera) of Israel and the Sinai Peninsula, pp. 471-492 in Zootaxa 3827 (4)</i> on page 491, DOI: 10.11646/zootaxa.3827.4.3, <a href="http://zenodo.org/record/224383">http://zenodo.org/record/224383</a&gt

Nabidae

Key to the species of Nabidae in Israel <p> 1. Fore femur strongly turgid, distinctly widest at mid-length (except in <i>Prostemma sanguineum</i> (Rossi)) and with 2–3 dense rows of black spinules (Fig. 3); fore tibia strongly widened from base to apex (Fig. 3). Usually brachypterous (Subfamily <i>Prostemmatinae</i>)......................................................................................... 2</p> <p> -. Fore femur moderately turgid, without projection and rows of black spinules; fore tibia not widened (Fig. 4). Usually macropterous (Subfamily <i>Nabinae</i>)....................................................................... 6</p> <p> 2. Pronotum dull. Connexivum delimited from sternites by row of small oblique ribs. Genitalia anterior to tip of abdomen ventrally (Figs. 13–14). Channel of metathoracic scent gland not directed cephalad (Fig. 10). Body dark brown to black, without yellow areas; hemelytron off-white; legs black or yellow. Body length 2.4–3.0mm.............. <i>Phorticus velutinus</i> Puton</p> <p>-. Pronotum shiny (Fig. 46–49). Connexivum not delimited from sternites by row of small oblique ribs. Genitalia at tip of abdomen (Figs. 11–12). Channel of metathoracic scent gland curved, with apical part directed cephalad or medio-cephalad (Figs. 6–9). Body light brown with yellow areas; hemelytron reddish; legs yellow. Body length 3.6–5.2mm................... 3</p> <p> 3. Fore and mid femur with submedial projection and rows of black spinules. Channel of metathoracic scent gland directed medio-cephalad (Fig. 9). Body black-brown with yellow areas. Body length 3.3–5.0mm... <i>Alloeorhynchus flavipes</i> (Fieber)</p> <p> -. Only fore femur with projection (absent in <i>Prostemma (Prostemma) sanguineum</i>) and rows of black spinules. Channel of metathoracic scent gland directed cephalad (Figs. 6, 7, 8, 10). Body black and red.................................. 4</p> <p> 4. Dorsal part of middle and hind femora black or dark brown. Pronotum never with red sheen. Body length 7.9–10.3 mm (Fig. 49)................................................................. <i>Prostemma</i> (<i>Prostemma</i>) <i>aeneicolle</i> Stein</p> <p>-. Femora entirely red. Pronotum sometimes with red sheen...................................................... 5</p> <p> 5. Pronotum and scutellum entirely black (Figs. 46–47). In brachypterous individuals, hemelytron truncate distally and membrane vestigial in the form of narrow stripe. Body length 7.2–10.1mm. Parameres and phallus as in Figs. 15, 31............................................................................. <i>Prostemma</i> (<i>Prostemma</i>) <i>guttula</i> (Fabricius)</p> <p>-. Pronotum and scutellum red (Fig. 48). In brachypterous individuals, hemelytron rounded distally and membrane larger. Body</p> <p> length 5.2–7.5mm. Parameres and phallus as in Figs. 16, 32................ <i>Prostemma</i> (<i>Prostemma</i>) <i>sanguineum</i> (Rossi) 6. Connexivum not delimited from sternites. Posterior corner of pronotum obliquely truncate. Body yellowish or grayish. Head and scutellum with one longitudinal black stripe; anterior lobe of pronotum with three such stripes; posterior part of fore femur and apex of hind femur brown or black (Figs. 53–54). Paramere as in Fig. 17, vagina as in Fig. 44. Body length 7.2– 9mm............................................................................ <i>Himacerus</i> (<i>Anaptus</i>) <i>major</i> (Costa)</p> <p>-. Connexivum delimited from sternites by distinct furrow or slit. Posterior corner of pronotum not truncate. Body coloration variable. Stripes on head, pronotum and scutellum present or absent. Posterior part of fore femur and usually also apex of hind femur yellow. Paramere and vagina different................................................................ 7</p> <p>7. Body green, sometimes with reddish or brownish pattern....................................................... 8</p> <p>-. Body yellowish or grayish, usually with brown median stripe on head, pronotum and scutellum........................ 9</p> <p> 8. Fore femur and mid femur ventrally with several yellowish or brown bristles situated on brown tubercles (Fig. 4). Rostrum not extended beyond fore coxa. Paramere with keel (extension of posterior margin of hypophysis) reaching middle of paramere (Fig. 21). Subbasal hook of phallus claw-like (Fig. 30). Vagina constricted in basal third, with very large parietal glands (Fig. 40). Body length 6.2–7.5mm.................................................... <i>Nabis (Aspilaspis) indicus</i> (Stål)</p> <p> -. Fore femur and mid femur with pale, hair-like bristles, or bristles brown and spine-like only on mid-femur, rarely one or two dark bristles on fore femur without brown tubercles at bases. Rostrum extended beyond fore coxa. Keel on paramere shorter, not reaching middle of paramere (Figs. 22–23). Subbasal hook of phallus not claw-like (Fig. 29). Vagina not constricted, with small parietal glands (Fig. 39). Body length 6–7.2mm............................. <i>Nabis (Aspilaspis) viridulus</i> Spinola</p> <p> 9. Body elongate oval, 3.2–3.5 times as long as pronotum width (Fig. 51). Connexivum with brown spots. Paramere markedly elongate (Fig. 24). Vagina as in Fig. 45. Body length 6.5– 8mm..................... <i>Nabis (Halonabis) sareptanus Dohrn</i></p> <p>-. Body more slender, 4–7 times as long as pronotum width (Fig. 50). Connexivum without brown spots. Paramere wider (Fig. 18)................................................................................................ 10</p> <p> 10. Delicate species with long legs and antennae; hemelytron, and usually also apex of corium, extended far beyond apex of abdomen (Fig. 50). Paramere with distal 2/3 of disc triangular, and recurrent plate not strongly bent (Figs. 18–19). Phallus with two hooks pointing in opposite directions (Figs. 33, 37). Vagina strongly asymmetrical, with round sac-like projection covering base of common oviduct dorsally (Fig. 41). Body length 7–9mm............... <i>Nabis (Tropiconabis) capsiformis</i> Germar</p> <p>-. Stouter species with shorter legs and antennae; hemelytron not extended beyond apex of abdomen; apex of corium not extending to apex of abdomen. Paramere with distal 2/3 of disc more or less rounded, not triangular, and recurrent plate variable (Figs. 20, 25–26). Phallus with one or two hooks, if two, then facing same direction (Figs. 34, 38). Vagina more or less symmetrical, without sac-like projection (Figs. 42–43).......................................................... 11</p> <p> 11. Corium always with small brownish spots at bases of hairs. Recurrent plate of paramere not curved (Fig. 20). In Israeli subspecies, phallus with two hooks (Figs. 34, 38), vagina with two parietal glands and straight base (Fig. 42). Body length 6.3–8.5mm............................................................... <i>Nabis (Nabis) pseudoferus orientarius</i> Remane</p> <p> -. Corium often without brownish spots at bases of hairs. Recurrent plate of paramere strongly curved (Figs. 25–26). Phallus with one hook (Fig. 36), vagina with one parietal gland and asymmetrical sac-like projection at base (Fig. 43). Body length 7–8.5mm................................................................ <i>Nabis (Nabis) palifer</i> Seidenstücker</p>Published as part of <i>Novoselsky, T., Freidberg, A., Dorchin, N., Meltzer, N. & Kerzhner, I., 2014, The Nabidae (Hemiptera: Heteroptera) of Israel and the Sinai Peninsula, pp. 471-492 in Zootaxa 3827 (4)</i> on pages 472-473, DOI: 10.11646/zootaxa.3827.4.3, <a href="http://zenodo.org/record/224383">http://zenodo.org/record/224383</a&gt

Himacerus (Anaptus) major

<i>Himacerus</i> (<i>Anaptus</i>) <i>major</i> (Costa, 1842) <p>(Figs. 11–12, 17, 44, 53–54, 66)</p> <p> <b>Material examined.</b> Har Hermon [Mt. Hermon], 2000m, 22.ii.1973, D. Furth (2♂); 23.v.1978, A. Freidberg (1♀), 21.vi.1982, A. Freidberg (1♂), 9.vi.1983, A. Freidberg (1♂, 1♀), 9.vi.1983, Y. Zvik (2♂, 3♀); 27.v.1986, A.</p> <p>Freidberg (2♂, 1♀), 1.vii.1986 A. Freidberg (1♂); 1900m, 9.vii.1987, Y. Zvik (1♂); 1650m, 30.vi.1978, D. Furth (1♂); 1600m, 7.vii.1987, Y. Zvik (1♂); 1500m, 21.v.1979, D. Furth (1♂); Mezudat Nemrod, 1000m, 8.xi.1984, A. Freidberg (1♀); Har Meron 1200m, 11.vi.1996, A. Freidberg (1♀); Har Meron 1100m, 10.vi.1987, A. Freidberg (1♂, 1♀); Har Meron, 5.xii.1961, M. P. Pener (1♀); 5.vi.1974, D. Furth (1♂), 29.v.1979, M. Kaplan (2♀), 20.v.1993, Y. Zvik (3♀).</p> <p> <b>Distribution.</b> Palaearctic. Western Europe, Mediterranean, except most of North Africa; introduced into North America. General distribution in Israel: Fig. 66.</p> <p> <b>Previous records.</b> Linnavuori (1973: 48; Har Meron).</p> <p> <b>Biology.</b> This species lives on and under grasses. In many countries it is confined to seashores, and the records from high altitudes on Har Hermon are therefore unusual (prior to the current work, the highest recorded altitude had been 1000m from the Canary Islands).</p>Published as part of <i>Novoselsky, T., Freidberg, A., Dorchin, N., Meltzer, N. & Kerzhner, I., 2014, The Nabidae (Hemiptera: Heteroptera) of Israel and the Sinai Peninsula, pp. 471-492 in Zootaxa 3827 (4)</i> on pages 476-477, DOI: 10.11646/zootaxa.3827.4.3, <a href="http://zenodo.org/record/224383">http://zenodo.org/record/224383</a&gt

Phorticus velutinus Puton 1890

<i>Phorticus velutinus</i> Puton, 1890 <p>(Figs. 10, 13–14)</p> <p> <b>Material examined.</b> None.</p> <p> <b>Distribution.</b> Palaearctic. Southern Spain, southeastern Turkey, Morocco and Egypt. <b>Biology.</b> This species apparently inhabits litter along lake and river margins. <b>Previous records.</b> None</p> <p> <b>Comments.</b> The occurrence of this species in Israel is probable in view of its known circum-mediterranean distribution.</p>Published as part of <i>Novoselsky, T., Freidberg, A., Dorchin, N., Meltzer, N. & Kerzhner, I., 2014, The Nabidae (Hemiptera: Heteroptera) of Israel and the Sinai Peninsula, pp. 471-492 in Zootaxa 3827 (4)</i> on page 476, DOI: 10.11646/zootaxa.3827.4.3, <a href="http://zenodo.org/record/224383">http://zenodo.org/record/224383</a&gt