Recoil-distance lifetime measurements in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>9</mn><mn>6</mn><mo>,</mo><mn>9</mn><mn>7</mn><mo>,</mo><mn>9</mn><mn>8</mn></mrow></msup></mrow><mi mathvariant="normal">Ru</mi><mo>:</mo></math></span> Search for possible onset of collectivity at <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">N</mi><mo>>~</mo><mn>52</mn></math></span>

B. Kharraja; U. Garg; S. S. Ghugre; H. Jin; R. V. F. Janssens; I. Ahmad; H. Amro; M. P. Carpenter; S. Fischer; T. L. Khoo; T. Lauritsen; D. Nisius; W. Reviol; W. F. Mueller; L. L. Riedinger; R. Kaczarowski; E. Ruchowska; W. C. Ma; I. M. Govil

doi:10.1103/PhysRevC.61.024301

Recoil-distance lifetime measurements in $^{96, 97, 98} Ru :$ Search for possible onset of collectivity at $N >~ 52$

B. Kharraja, U. Garg, S. S. Ghugre, H. Jin, R. V. F. Janssens, I. Ahmad, H. Amro, M. P. Carpenter, S. Fischer, T. L. Khoo, T. Lauritsen, D. Nisius, W. Reviol, W. F. Mueller, L. L. Riedinger, R. Kaczarowski, E. Ruchowska, W. C. Ma, and I. M. Govil

Phys. Rev. C 61, 024301 – Published 22 December 1999

Abstract

Lifetimes of high-spin states in the $N = 52 - 54 Ru$ nuclei have been investigated via the $^{65} Cu (^{36} S {, p y n)}^{96, 97, 98} Ru (y = 4, 3, 2)$ reactions using the recoil-distance Doppler-shift technique. The data were collected in coincidence mode. Lifetimes have been extracted for both the positive- and the negative-parity states in $^{96} Ru$ and $^{98} Ru$ and for the positive-parity states in $^{97} Ru .$ The levels studied have lifetimes in the range 2–31 ps. The observed reduced transition probabilities $B (E 2)$ and $B (M 1)$ are compared with the predictions of the shell model. Theoretical implications of these results are discussed.

Received 28 April 1999

DOI:https://doi.org/10.1103/PhysRevC.61.024301

Authors & Affiliations

B. Kharraja^*, U. Garg, S. S. Ghugre^†, and H. Jin

Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

R. V. F. Janssens, I. Ahmad, H. Amro, M. P. Carpenter, S. Fischer^‡, T. L. Khoo, T. Lauritsen, and D. Nisius^§

Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

W. Reviol, W. F. Mueller^∥, and L. L. Riedinger

Department of Physics, University of Tennessee, Knoxville, Tennessee 37996

R. Kaczarowski and E. Ruchowska

Soltan Institute for Nuclear Studies, 05-400 Swierk, Poland

W. C. Ma

Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762

I. M. Govil

Department of Physics, Panjab University, Chandigarh 160 014, India

^*On leave from Physics Department, University Chouaib Doukkali, BP 20, El Jadida, Morocco.
^†Present address: IUCDAEF-Calcutta Center, Sector III/LB-8, Bidhan Nagar, Calcutta 700 091, India.
^‡Present address: Physics Department, De Paul University, Chicago, IL 60614.
^§Present address: Bio-Imaging Research Inc., Lincolnshire, IL 60069.
^∥Present address: NSCL, Michigan State University, East Lansing, MI 48824.

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Vol. 61, Iss. 2 — February 2000

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