Population of the giant pairing vibration

Laskin, M.; Casten, R. F.; Macchiavelli, A. O.; Clark, R. M.; Bucurescu, D.

doi:10.1103/PhysRevC.93.034321

Title: Population of the giant pairing vibration

Journal Article · Thu Mar 17 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.034321· OSTI ID:1379161

Laskin, M. ^[1]; Casten, R. F. ^[1]; Macchiavelli, A. O. ^[2]; Clark, R. M. ^[2]; Bucurescu, D. ^[3]

Yale Univ., New Haven, CT (United States). Department of Physics, Wright Laboratory
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
National Institute for Physics and Nuclear Engineering (Romania)

Background: We present that the giant pairing vibration (GPV), a correlated two-nucleon mode in the second shell above the Fermi surface, has long been predicted and expected to be strongly populated in two-nucleon transfer cross sections similar to those of the normal pairing vibration. Recent experiments have provided evidence for this mode in ^14,15C but, despite sensitive studies, it has not been definitively identified in either Sn or Pb nuclei where pairing correlations are known to play a crucial role. Purpose: Our aim is to test whether features inherent to the mixing of bound and unbound levels might account for this and to study the effect in a simple and intuitively clear approach. Method: We study the mixing of unbound levels in a set of toy models that capture the essential physics of the GPV, along with a more realistic calculation including distorted-wave Born approximation transfer amplitudes. Results: The calculated (relative) cross section to populate a simulated GPV state is effectively low, compared to the case of bound levels with no widths Conclusions: The mixing turns out to be only a minor contributor to the weak population. Rather, the main reason is the melting of the GPV peak due to the width it acquires from the low orbital angular momentum single-particle states playing a dominant role in two-nucleon transfer amplitudes. Lastly, this effect, in addition to a severe Q-value mismatch, may account for the elusive nature of this mode in (t,p) and (p,t) reactions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; FG02-91ER40609; AC02-05CH11231(LBNL); FG02-91Er40609(Yale)

OSTI ID:: 1379161

Alternate ID(s):: OSTI ID: 1242566

Journal Information:: Physical Review C, Vol. 93, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (4)

Giant Pairing Vibrations in light nuclei Cavallaro, M.; Cappuzzello, F.; Carbone, D. The European Physical Journal A, Vol. 55, Issue 12 https://doi.org/10.1140/epja/i2019-12786-2	journal	December 2019
The Giant Pairing Vibration in heavy nuclei: Present status and future studies Assié, M.; Dasso, C. H.; Liotta, R. J. The European Physical Journal A, Vol. 55, Issue 12 https://doi.org/10.1140/epja/i2019-12829-8	journal	December 2019
An overview of the scientific contribution of Andrea Vitturi to nuclear physics: Being an account of the recent TNP19 meeting held in Padova Fortunato, L.; Alonso, C. E.; Arias, J. M. The European Physical Journal A, Vol. 56, Issue 2 https://doi.org/10.1140/epja/s10050-020-00034-x	journal	February 2020
An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova) Fortunato, L.; Alonso, C. E.; Arias, J. M. arXiv https://doi.org/10.48550/arxiv.1912.03932	text	January 2019

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