The deformation driving $\ensuremath{\nu}{i}_{13/2}$ [660]1/2 structure has been identified for the first time in ${}^{131}\mathrm{Nd}.$ It is the lightest Nd $(Z=60)$ isotope in which a band based on this intruder orbital has been reported. A crossing between the [411]1/2 band and the [660]1/2 sequence takes place near $\ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\approx}0.34$ MeV with a large interaction strength $(|V{|}_{\mathrm{max}}=47$ keV). Thus, a smooth transition from the normal to the highly deformed minimum is established in ${}^{131}\mathrm{Nd}.$

10.1103/physrevc.60.041301

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Citations (9)

Two-Proton Emission from the Ground State ofO12

Physical Review Letters (1995)

R. A. Kryger A. Azhari M. Hellström J. H. Kelley T. Kubo

The three-body decay $^{12}\mathrm{O}\ensuremath{\rightarrow}2p+^{10}\mathrm{C}$ was studied following production via single-neutron stripping from a radioactive $^{13}\mathrm{O}$ projectile. This is the first observation of two-proton emission from an unbound ground state where the one-proton emission channel is energetically closed beyond the lightest case of $^{6}\mathrm{Be}$. No evidence for $^{2}\mathrm{He}$ emission is seen, despite predictions for a large diproton branching ratio. An upper limit of 7% (95% C.L.) is established for this decay branch. The implications of the small diproton branching ratio observed here and seen previously in $^{6}\mathrm{Be}$ are discussed.

Branching fraction

Proton decay

Stripping (fiber)

10.1103/physrevlett.74.860

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Citations (138)

Directional-correlation attenuation factors for Ge(Li) γ-ray detectors

Nuclear Instruments and Methods (1968)

W.G. Winn D. G. Sarantites

Coaxial

Solid angle

Correction for attenuation

10.1016/0029-554x(68)90059-1

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Citations (47)

Superdeformation, Exotic Decays, and Isospin Symmetry in the Mass A~60 Region

Liselotte Andersson D. Rudolph Emma Johansson D. A. Torres C. Andreoiu

Source

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Citations (0)

Transition strengths and band terminations in86Zr

Physical Review C (2003)

M. Wiedeking S. L. Tabor F. Cristancho M. Devlin J. Döring

High angular momentum states in ${}^{86}\mathrm{Zr}$ were populated through the ${}^{58}\mathrm{Ni}{(}^{32}\mathrm{S},4p)$ reaction at 135 MeV using the 88-In. Cyclotron at Lawrence Berkeley National Laboratory. Recoiling ${}^{86}\mathrm{Zr}$ nuclei were stopped in a thick Ta backing. Prompt multi-$\ensuremath{\gamma}$ coincidences with evaporated charged particles were detected using the full array of GAMMASPHERE and the MICROBALL. Mean lifetimes of 36 levels in ${}^{86}\mathrm{Zr}$ were measured using the Doppler-shift attenuation method. Transition quadrupole moments ${Q}_{t}$ were found in the range of about $0.3--1.5e\mathrm{b}$ in the positive-parity bands. The negative-parity bands show ${Q}_{t}$ values from about 0.25 to $1.2e\mathrm{b}.$ In the yrast positive-parity band, a sharp drop in collectivity approaching the ${30}^{+}$ state supports the interpretation of band termination in this configuration. Decreasing ${Q}_{t}$ values approaching the ${24}^{+}$ and ${27}^{\ensuremath{-}}$ states also provide an indication of terminating structures.

Yrast

Gammasphere

Parity (physics)

10.1103/physrevc.67.034320

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Citations (14)

Multiple Band Structures in ^131Nd and ^130Nd.

APS (1998)

W. Reviol Hengyi Jin L. L. Riedinger B. H. Smith N. P. Yoder

Source

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Citations (0)

High-resolution in-beam particle spectroscopy --New results on prompt proton emission from 58Cu

The European Physical Journal A (2002)

D. Rudolph D. G. Sarantites C. Andreoiu C. Fahlander D. P. Balamuth

Beam energy

Gammasphere

Semiconductor detector

10.1140/epja/i2002-10005-1

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Citations (25)

ΔI=4Bifurcation in Identical Superdeformed Bands

Physical Review Letters (1997)

D. S. Haslip Stéphane Flibotte G. de France M. Devlin A. Galindo-Uribarri

$\ensuremath{\Delta}I\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$ bifurcation has been observed in two superdeformed bands, the newly discovered yrast superdeformed band of ${}^{148}\mathrm{Eu}$, and a previously known excited band in ${}^{148}\mathrm{Gd}$. Both of these bands have moments of inertia that are identical to the yrast band of ${}^{149}\mathrm{Gd}$, the first superdeformed band in which this bifurcation was observed. This first observation of $\ensuremath{\Delta}I\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$ bifurcation in identical superdeformed bands provides a crucial test of recent models.

Yrast

Moment of inertia

10.1103/physrevlett.78.3447

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Citations (40)

Highly deformed structures in the mass∼130 region and their relative quadrupole moments

AIP conference proceedings (1999)

F. G. Kondev M. A. Riley E. S. Paul T. B. Brown R. M. Clark

The quadrupole moments for variety of configurations, involving the 9/2+[404](g9/2) proton, 1/2+[660](i13/2) and 1/2−[541](f7/2,h9/2) neutron orbitals, were measured using the Doppler-shift attenuation method in a wide range of nuclei in the mass∼130 region. While the involvement of the first two orbitals leads to quadrupole deformations that are comparable to those observed for the so-called superdeformed bands in this mass region, the β2 values for structures that include the 1/2−[541] neutron are found to lie intermediate between those observed for normally deformed and highly deformed bands.

10.1063/1.59522

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Origin of slow, heavy residues observed in dissipativeAu197+…

Physical Review C (1996)

W. Skulski B. Djerroud D. K. Agnihotri S. P. Baldwin J. Tōke

An exclusive measurement of slow, massive residues from the $^{197}\mathrm{Au}$+$^{86}\mathrm{Kr}$ reaction at E/A=35 MeV has been performed in coincidence with projectile-like fragments, neutrons, as well as light- and intermediate-mass charged products. The highly efficient (double $4\ensuremath{\pi}$) detector setup used included the University of Rochester SuperBall neutron detector and the Washington University Microball. The observed large yield of slow, massive residues shows characteristics consistent with a production scenario similar to that of binary dissipative collisions. The residues result from the statistical decay of primary targetlike fragments, produced even in the most dissipative collisions identified in the present experiment.

10.1103/physrevc.53.r2594

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Citations (14)